mirror of
https://github.com/postgres/postgres.git
synced 2025-05-08 07:21:33 +03:00
Tue Jan 30 22:24:00 GMT 2001 peter@retep.org.uk
- Fixed bug where Statement.setMaxRows() was a global setting. Now
limited to just itself.
- Changed LargeObject.read(byte[],int,int) to return the actual number
of bytes read (used to be void).
- LargeObject now supports InputStream's!
- PreparedStatement.setBinaryStream() now works!
- ResultSet.getBinaryStream() now returns an InputStream that doesn't
copy the blob into memory first!
- Connection.isClosed() now tests to see if the connection is still alive
rather than if it thinks it's alive.
This commit is contained in:
Peter Mount
parent
dca0762efc
commit
8439a83d84
@ -1,3 +1,14 @@
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Tue Jan 30 22:24:00 GMT 2001 peter@retep.org.uk
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- Fixed bug where Statement.setMaxRows() was a global setting. Now
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limited to just itself.
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- Changed LargeObject.read(byte[],int,int) to return the actual number
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of bytes read (used to be void).
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- LargeObject now supports InputStream's!
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- PreparedStatement.setBinaryStream() now works!
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- ResultSet.getBinaryStream() now returns an InputStream that doesn't
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copy the blob into memory first!
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- Connection.isClosed() now tests to see if the connection is still alive
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rather than if it thinks it's alive.
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Thu Jan 25 09:11:00 GMT 2001 peter@retep.org.uk
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- Added an alternative constructor to PGSQLException so that debugging
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some more osteric bugs is easier. If only 1 arg is supplied and it's
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@ -6,7 +6,7 @@ import java.text.*;
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/**
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*
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* $Id: basic.java,v 1.5 2000/06/06 11:05:57 peter Exp $
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* $Id: basic.java,v 1.6 2001/01/31 08:26:01 peter Exp $
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*
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* This example tests the basic components of the JDBC driver, and shows
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* how even the simplest of queries can be implemented.
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@ -22,40 +22,40 @@ public class basic
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{
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Connection db; // The connection to the database
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Statement st; // Our statement to run queries with
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public basic(String args[]) throws ClassNotFoundException, FileNotFoundException, IOException, SQLException
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{
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String url = args[0];
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String usr = args[1];
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String pwd = args[2];
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// Load the driver
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Class.forName("org.postgresql.Driver");
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// Connect to database
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System.out.println("Connecting to Database URL = " + url);
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db = DriverManager.getConnection(url, usr, pwd);
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System.out.println("Connected...Now creating a statement");
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st = db.createStatement();
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// Clean up the database (in case we failed earlier) then initialise
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cleanup();
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// Now run tests using JDBC methods
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doexample();
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// Clean up the database
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cleanup();
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// Finally close the database
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System.out.println("Now closing the connection");
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st.close();
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db.close();
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//throw postgresql.Driver.notImplemented();
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}
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/**
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* This drops the table (if it existed). No errors are reported.
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*/
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@ -67,35 +67,36 @@ public class basic
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// We ignore any errors here
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}
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}
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/**
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* This performs the example
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*/
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public void doexample() throws SQLException
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{
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System.out.println("\nRunning tests:");
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// First we need a table to store data in
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st.executeUpdate("create table basic (a int2, b int2)");
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// Now insert some data, using the Statement
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st.executeUpdate("insert into basic values (1,1)");
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st.executeUpdate("insert into basic values (2,1)");
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st.executeUpdate("insert into basic values (3,1)");
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// This shows how to get the oid of a just inserted row
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// updated for 7.1
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st.executeUpdate("insert into basic values (4,1)");
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int insertedOID = ((org.postgresql.ResultSet)st.getResultSet()).getInsertedOID();
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int insertedOID = ((org.postgresql.jdbc2.Statement)st).getInsertedOID();
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System.out.println("Inserted row with oid "+insertedOID);
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// Now change the value of b from 1 to 8
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st.executeUpdate("update basic set b=8");
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System.out.println("Updated "+st.getUpdateCount()+" rows");
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// Now delete 2 rows
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st.executeUpdate("delete from basic where a<3");
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System.out.println("deleted "+st.getUpdateCount()+" rows");
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// For large inserts, a PreparedStatement is more efficient, because it
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// supports the idea of precompiling the SQL statement, and to store
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// directly, a Java object into any column. PostgreSQL doesnt support
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@ -112,7 +113,7 @@ public class basic
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ps.executeUpdate(); // executeUpdate because insert returns no data
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}
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ps.close(); // Always close when we are done with it
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// Finally perform a query on the table
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System.out.println("performing a query");
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ResultSet rs = st.executeQuery("select a, b from basic");
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@ -126,7 +127,7 @@ public class basic
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}
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rs.close(); // again, you must close the result when done
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}
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// Now run the query again, showing a more efficient way of getting the
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// result if you don't know what column number a value is in
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System.out.println("performing another query");
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@ -140,7 +141,7 @@ public class basic
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//
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int col_a = rs.findColumn("a");
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int col_b = rs.findColumn("b");
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// Now we run through the result set, printing out the result.
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// Again, we must call .next() before attempting to read any results
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while(rs.next()) {
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@ -150,11 +151,22 @@ public class basic
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}
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rs.close(); // again, you must close the result when done
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}
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// Now test maxrows by setting it to 3 rows
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st.setMaxRows(3);
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System.out.println("performing a query limited to "+st.getMaxRows());
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rs = st.executeQuery("select a, b from basic");
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while(rs.next()) {
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int a = rs.getInt("a"); // This shows how to get the value by name
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int b = rs.getInt(2); // This shows how to get the value by column
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System.out.println(" a="+a+" b="+b);
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}
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rs.close(); // again, you must close the result when done
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// The last thing to do is to drop the table. This is done in the
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// cleanup() method.
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}
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/**
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* Display some instructions on how to run the example
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*/
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@ -164,22 +176,22 @@ public class basic
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System.out.println("Useage:\n java example.basic jdbc:postgresql:database user password [debug]\n\nThe debug field can be anything. It's presence will enable DriverManager's\ndebug trace. Unless you want to see screens of items, don't put anything in\nhere.");
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System.exit(1);
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}
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/**
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* This little lot starts the test
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*/
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public static void main(String args[])
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{
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System.out.println("PostgreSQL basic test v6.3 rev 1\n");
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if(args.length<3)
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instructions();
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// This line outputs debug information to stderr. To enable this, simply
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// add an extra parameter to the command line
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if(args.length>3)
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DriverManager.setLogStream(System.err);
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// Now run the tests
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try {
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basic test = new basic(args);
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@ -9,7 +9,7 @@
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<property category="sys" name="CheckStable" value="1" />
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<property category="sys" name="Company" value="" />
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<property category="sys" name="Copyright" value="Copyright (c) 2001" />
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<property category="sys" name="DefaultPackage" value="org.postgresql.core" />
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<property category="sys" name="DefaultPackage" value="org.postgresql.largeobject" />
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<property category="sys" name="Description" value="" />
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<property category="sys" name="DocPath" value="doc" />
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<property category="sys" name="ExcludeClassEnabled" value="0" />
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@ -10,7 +10,7 @@ import org.postgresql.largeobject.*;
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import org.postgresql.util.*;
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/**
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* $Id: Connection.java,v 1.13 2001/01/18 17:37:12 peter Exp $
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* $Id: Connection.java,v 1.14 2001/01/31 08:26:01 peter Exp $
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*
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* This abstract class is used by org.postgresql.Driver to open either the JDBC1 or
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* JDBC2 versions of the Connection class.
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@ -22,7 +22,7 @@ public abstract class Connection
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public PG_Stream pg_stream;
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// This is set by org.postgresql.Statement.setMaxRows()
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public int maxrows = 0; // maximum no. of rows; 0 = unlimited
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//public int maxrows = 0; // maximum no. of rows; 0 = unlimited
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private String PG_HOST;
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private int PG_PORT;
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@ -414,6 +414,11 @@ public abstract class Connection
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*/
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public java.sql.ResultSet ExecSQL(String sql,java.sql.Statement stat) throws SQLException
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{
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// added Jan 30 2001 to correct maxrows per statement
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int maxrows=0;
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if(stat!=null)
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maxrows=stat.getMaxRows();
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// added Oct 7 1998 to give us thread safety.
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synchronized(pg_stream) {
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// Deallocate all resources in the stream associated
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@ -29,6 +29,7 @@ public class Statement implements java.sql.Statement
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SQLWarning warnings = null; // The warnings chain.
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int timeout = 0; // The timeout for a query (not used)
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boolean escapeProcessing = true;// escape processing flag
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int maxrows=0;
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/**
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* Constructor for a Statement. It simply sets the connection
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@ -129,7 +130,7 @@ public class Statement implements java.sql.Statement
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*/
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public int getMaxRows() throws SQLException
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{
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return connection.maxrows;
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return maxrows;
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}
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/**
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@ -141,7 +142,7 @@ public class Statement implements java.sql.Statement
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*/
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public void setMaxRows(int max) throws SQLException
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{
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connection.maxrows = max;
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maxrows = max;
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}
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/**
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@ -17,7 +17,7 @@ import org.postgresql.largeobject.*;
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import org.postgresql.util.*;
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/**
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* $Id: Connection.java,v 1.5 2001/01/18 17:37:14 peter Exp $
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* $Id: Connection.java,v 1.6 2001/01/31 08:26:02 peter Exp $
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*
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* A Connection represents a session with a specific database. Within the
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* context of a Connection, SQL statements are executed and results are
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@ -265,7 +265,27 @@ public class Connection extends org.postgresql.Connection implements java.sql.Co
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*/
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public boolean isClosed() throws SQLException
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{
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return (pg_stream == null);
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// If the stream is gone, then close() was called
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if(pg_stream == null)
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return true;
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// ok, test the connection
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try {
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// by sending an empty query. If we are dead, then an SQLException should
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// be thrown
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java.sql.ResultSet rs = ExecSQL(" ");
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if(rs!=null)
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rs.close();
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// By now, we must be alive
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return false;
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} catch(SQLException se) {
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// Why throw an SQLException as this may fail without throwing one,
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// ie isClosed() is called incase the connection has died, and we don't
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// want to find out by an Exception, so instead we return true, as its
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// most likely why it was thrown in the first place.
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return true;
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}
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}
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/**
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@ -23,13 +23,13 @@ import org.postgresql.util.*;
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* parameter. For instance, if the IN parameter has SQL type Integer, then
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* setInt should be used.
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*
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* <p>If arbitrary parameter type conversions are required, then the setObject
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* <p>If arbitrary parameter type conversions are required, then the setObject
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* method should be used with a target SQL type.
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*
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* @see ResultSet
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* @see java.sql.PreparedStatement
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*/
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public class PreparedStatement extends Statement implements java.sql.PreparedStatement
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public class PreparedStatement extends Statement implements java.sql.PreparedStatement
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{
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String sql;
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String[] templateStrings;
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@ -124,7 +124,7 @@ public class PreparedStatement extends Statement implements java.sql.PreparedSta
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}
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s.append(templateStrings[inStrings.length]);
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return super.executeUpdate(s.toString()); // in Statement class
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}
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}
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/**
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* Set a parameter to SQL NULL
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@ -264,7 +264,7 @@ public class PreparedStatement extends Statement implements java.sql.PreparedSta
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else {
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StringBuffer b = new StringBuffer();
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int i;
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b.append('\'');
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for (i = 0 ; i < x.length() ; ++i)
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{
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@ -327,7 +327,7 @@ public class PreparedStatement extends Statement implements java.sql.PreparedSta
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//
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//set(parameterIndex, df.format(new java.util.Date(x.getTime()+86400000)));
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}
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/**
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* Set a parameter to a java.sql.Time value. The driver converts
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* this to a SQL TIME value when it sends it to the database.
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@ -406,7 +406,7 @@ public class PreparedStatement extends Statement implements java.sql.PreparedSta
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* When a very large binary value is input to a LONGVARBINARY parameter,
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* it may be more practical to send it via a java.io.InputStream.
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* JDBC will read the data from the stream as needed, until it reaches
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* end-of-file.
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* end-of-file.
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*
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* <P><B>Note:</B> This stream object can either be a standard Java
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* stream object or your own subclass that implements the standard
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@ -418,7 +418,25 @@ public class PreparedStatement extends Statement implements java.sql.PreparedSta
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*/
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public void setBinaryStream(int parameterIndex, InputStream x, int length) throws SQLException
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{
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throw new PSQLException("postgresql.prep.is");
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LargeObjectManager lom = connection.getLargeObjectAPI();
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int oid = lom.create();
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LargeObject lob = lom.open(oid);
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OutputStream los = lob.getOutputStream();
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try {
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// could be buffered, but then the OutputStream returned by LargeObject
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// is buffered internally anyhow, so there would be no performance
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// boost gained, if anything it would be worse!
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int c=x.read();
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while(c>-1) {
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los.write(c);
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c=x.read();
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}
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los.close();
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} catch(IOException se) {
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throw new PSQLException("postgresql.prep.is",se);
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}
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// lob is closed by the stream so don't call lob.close()
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setInt(parameterIndex,oid);
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}
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/**
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@ -453,7 +471,7 @@ public class PreparedStatement extends Statement implements java.sql.PreparedSta
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* @param x the object containing the input parameter value
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* @param targetSqlType The SQL type to be send to the database
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* @param scale For java.sql.Types.DECIMAL or java.sql.Types.NUMERIC
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* types this is the number of digits after the decimal. For
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* types this is the number of digits after the decimal. For
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* all other types this value will be ignored.
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* @exception SQLException if a database access error occurs
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*/
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@ -501,7 +519,7 @@ public class PreparedStatement extends Statement implements java.sql.PreparedSta
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{
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setObject(parameterIndex, x, targetSqlType, 0);
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}
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/**
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* This stores an Object into a parameter.
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* <p>New for 6.4, if the object is not recognised, but it is
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@ -542,7 +560,7 @@ public class PreparedStatement extends Statement implements java.sql.PreparedSta
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/**
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* Some prepared statements return multiple results; the execute method
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* handles these complex statements as well as the simpler form of
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* handles these complex statements as well as the simpler form of
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* statements handled by executeQuery and executeUpdate
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*
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* @return true if the next result is a ResultSet; false if it is an
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@ -584,11 +602,11 @@ public class PreparedStatement extends Statement implements java.sql.PreparedSta
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s.append(templateStrings[inStrings.length]);
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return s.toString();
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}
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// **************************************************************
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// END OF PUBLIC INTERFACE
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// END OF PUBLIC INTERFACE
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// **************************************************************
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/**
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* There are a lot of setXXX classes which all basically do
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* the same thing. We need a method which actually does the
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@ -604,62 +622,62 @@ public class PreparedStatement extends Statement implements java.sql.PreparedSta
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throw new PSQLException("postgresql.prep.range");
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inStrings[paramIndex - 1] = s;
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}
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// ** JDBC 2 Extensions **
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public void addBatch() throws SQLException
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{
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throw org.postgresql.Driver.notImplemented();
|
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}
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|
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public java.sql.ResultSetMetaData getMetaData() throws SQLException
|
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{
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throw org.postgresql.Driver.notImplemented();
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}
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public void setArray(int i,Array x) throws SQLException
|
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{
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throw org.postgresql.Driver.notImplemented();
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}
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public void setBlob(int i,Blob x) throws SQLException
|
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{
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throw org.postgresql.Driver.notImplemented();
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}
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|
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|
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public void setCharacterStream(int i,java.io.Reader x,int length) throws SQLException
|
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{
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throw org.postgresql.Driver.notImplemented();
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}
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public void setClob(int i,Clob x) throws SQLException
|
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{
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throw org.postgresql.Driver.notImplemented();
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}
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|
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public void setNull(int i,int t,String s) throws SQLException
|
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{
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throw org.postgresql.Driver.notImplemented();
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}
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|
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public void setRef(int i,Ref x) throws SQLException
|
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{
|
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throw org.postgresql.Driver.notImplemented();
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}
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|
||||
public void setDate(int i,java.sql.Date d,java.util.Calendar cal) throws SQLException
|
||||
{
|
||||
throw org.postgresql.Driver.notImplemented();
|
||||
}
|
||||
|
||||
|
||||
public void setTime(int i,Time t,java.util.Calendar cal) throws SQLException
|
||||
{
|
||||
throw org.postgresql.Driver.notImplemented();
|
||||
}
|
||||
|
||||
|
||||
public void setTimestamp(int i,Timestamp t,java.util.Calendar cal) throws SQLException
|
||||
{
|
||||
throw org.postgresql.Driver.notImplemented();
|
||||
}
|
||||
|
||||
|
||||
}
|
||||
|
||||
@ -581,6 +581,15 @@ public class ResultSet extends org.postgresql.ResultSet implements java.sql.Resu
|
||||
*/
|
||||
public InputStream getBinaryStream(int columnIndex) throws SQLException
|
||||
{
|
||||
// New in 7.1 Handle OID's as BLOBS so return the input stream
|
||||
if(!wasNullFlag)
|
||||
if( fields[columnIndex - 1].getOID() == 26) {
|
||||
LargeObjectManager lom = connection.getLargeObjectAPI();
|
||||
LargeObject lob = lom.open(getInt(columnIndex));
|
||||
return lob.getInputStream();
|
||||
}
|
||||
|
||||
// Not an OID so fake the stream
|
||||
byte b[] = getBytes(columnIndex);
|
||||
|
||||
if (b != null)
|
||||
|
||||
@ -32,6 +32,7 @@ public class Statement implements java.sql.Statement
|
||||
private Vector batch=null;
|
||||
int resultsettype; // the resultset type to return
|
||||
int concurrency; // is it updateable or not?
|
||||
int maxrows=0; // the maximum number of rows to return 0=unlimited
|
||||
|
||||
/**
|
||||
* Constructor for a Statement. It simply sets the connection
|
||||
@ -134,7 +135,7 @@ public class Statement implements java.sql.Statement
|
||||
*/
|
||||
public int getMaxRows() throws SQLException
|
||||
{
|
||||
return connection.maxrows;
|
||||
return maxrows;
|
||||
}
|
||||
|
||||
/**
|
||||
@ -146,7 +147,7 @@ public class Statement implements java.sql.Statement
|
||||
*/
|
||||
public void setMaxRows(int max) throws SQLException
|
||||
{
|
||||
connection.maxrows = max;
|
||||
maxrows = max;
|
||||
}
|
||||
|
||||
/**
|
||||
@ -274,7 +275,8 @@ public class Statement implements java.sql.Statement
|
||||
if(escapeProcessing)
|
||||
sql=connection.EscapeSQL(sql);
|
||||
|
||||
result = connection.ExecSQL(sql);
|
||||
// New in 7.1, pass Statement so that ExecSQL can customise to it
|
||||
result = connection.ExecSQL(sql,this);
|
||||
|
||||
// New in 7.1, required for ResultSet.getStatement() to work
|
||||
((org.postgresql.jdbc2.ResultSet)result).setStatement(this);
|
||||
@ -388,11 +390,6 @@ public class Statement implements java.sql.Statement
|
||||
throw org.postgresql.Driver.notImplemented();
|
||||
}
|
||||
|
||||
//public int getKeysetSize() throws SQLException
|
||||
//{
|
||||
// throw org.postgresql.Driver.notImplemented();
|
||||
//}
|
||||
|
||||
public int getResultSetConcurrency() throws SQLException
|
||||
{
|
||||
// new in 7.1
|
||||
@ -415,11 +412,6 @@ public class Statement implements java.sql.Statement
|
||||
throw org.postgresql.Driver.notImplemented();
|
||||
}
|
||||
|
||||
//public void setKeysetSize(int keys) throws SQLException
|
||||
//{
|
||||
// throw org.postgresql.Driver.notImplemented();
|
||||
//}
|
||||
|
||||
public void setResultSetConcurrency(int value) throws SQLException
|
||||
{
|
||||
concurrency=value;
|
||||
@ -430,4 +422,17 @@ public class Statement implements java.sql.Statement
|
||||
resultsettype=value;
|
||||
}
|
||||
|
||||
/**
|
||||
* New in 7.1: Returns the Last inserted oid. This should be used, rather
|
||||
* than the old method using getResultSet, which for executeUpdate returns
|
||||
* null.
|
||||
* @return OID of last insert
|
||||
*/
|
||||
public int getInsertedOID() throws SQLException
|
||||
{
|
||||
if(result!=null)
|
||||
return ((org.postgresql.ResultSet)result).getInsertedOID();
|
||||
return 0;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
@ -0,0 +1,156 @@
|
||||
package org.postgresql.largeobject;
|
||||
|
||||
import java.io.InputStream;
|
||||
import java.io.IOException;
|
||||
import java.sql.SQLException;
|
||||
|
||||
/**
|
||||
* This is an initial implementation of an InputStream from a large object.
|
||||
* For now, the bare minimum is implemented. Later (after 7.1) we will overide
|
||||
* the other read methods to optimise them.
|
||||
*/
|
||||
public class BlobInputStream extends InputStream {
|
||||
/**
|
||||
* The parent LargeObject
|
||||
*/
|
||||
private LargeObject lo;
|
||||
|
||||
/**
|
||||
* Buffer used to improve performance
|
||||
*/
|
||||
private byte[] buffer;
|
||||
|
||||
/**
|
||||
* Position within buffer
|
||||
*/
|
||||
private int bpos;
|
||||
|
||||
/**
|
||||
* The buffer size
|
||||
*/
|
||||
private int bsize;
|
||||
|
||||
/**
|
||||
* The mark position
|
||||
*/
|
||||
private int mpos=0;
|
||||
|
||||
/**
|
||||
* @param lo LargeObject to read from
|
||||
*/
|
||||
public BlobInputStream(LargeObject lo) {
|
||||
this(lo,1024);
|
||||
}
|
||||
|
||||
/**
|
||||
* @param lo LargeObject to read from
|
||||
* @param bsize buffer size
|
||||
*/
|
||||
public BlobInputStream(LargeObject lo,int bsize) {
|
||||
this.lo=lo;
|
||||
buffer=null;
|
||||
bpos=0;
|
||||
this.bsize=bsize;
|
||||
}
|
||||
|
||||
/**
|
||||
* The minimum required to implement input stream
|
||||
*/
|
||||
public int read() throws java.io.IOException {
|
||||
try {
|
||||
if(buffer==null || bpos>=buffer.length) {
|
||||
buffer=lo.read(bsize);
|
||||
bpos=0;
|
||||
}
|
||||
|
||||
// Handle EOF
|
||||
if(bpos>=buffer.length)
|
||||
return -1;
|
||||
|
||||
return (int) buffer[bpos++];
|
||||
} catch(SQLException se) {
|
||||
throw new IOException(se.toString());
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Closes this input stream and releases any system resources associated
|
||||
* with the stream.
|
||||
*
|
||||
* <p> The <code>close</code> method of <code>InputStream</code> does
|
||||
* nothing.
|
||||
*
|
||||
* @exception IOException if an I/O error occurs.
|
||||
*/
|
||||
public void close() throws IOException {
|
||||
try {
|
||||
lo.close();
|
||||
lo=null;
|
||||
} catch(SQLException se) {
|
||||
throw new IOException(se.toString());
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Marks the current position in this input stream. A subsequent call to
|
||||
* the <code>reset</code> method repositions this stream at the last marked
|
||||
* position so that subsequent reads re-read the same bytes.
|
||||
*
|
||||
* <p> The <code>readlimit</code> arguments tells this input stream to
|
||||
* allow that many bytes to be read before the mark position gets
|
||||
* invalidated.
|
||||
*
|
||||
* <p> The general contract of <code>mark</code> is that, if the method
|
||||
* <code>markSupported</code> returns <code>true</code>, the stream somehow
|
||||
* remembers all the bytes read after the call to <code>mark</code> and
|
||||
* stands ready to supply those same bytes again if and whenever the method
|
||||
* <code>reset</code> is called. However, the stream is not required to
|
||||
* remember any data at all if more than <code>readlimit</code> bytes are
|
||||
* read from the stream before <code>reset</code> is called.
|
||||
*
|
||||
* <p> The <code>mark</code> method of <code>InputStream</code> does
|
||||
* nothing.
|
||||
*
|
||||
* @param readlimit the maximum limit of bytes that can be read before
|
||||
* the mark position becomes invalid.
|
||||
* @see java.io.InputStream#reset()
|
||||
*/
|
||||
public synchronized void mark(int readlimit) {
|
||||
try {
|
||||
mpos=lo.tell();
|
||||
} catch(SQLException se) {
|
||||
//throw new IOException(se.toString());
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Repositions this stream to the position at the time the
|
||||
* <code>mark</code> method was last called on this input stream.
|
||||
* NB: If mark is not called we move to the begining.
|
||||
* @see java.io.InputStream#mark(int)
|
||||
* @see java.io.IOException
|
||||
*/
|
||||
public synchronized void reset() throws IOException {
|
||||
try {
|
||||
lo.seek(mpos);
|
||||
} catch(SQLException se) {
|
||||
throw new IOException(se.toString());
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Tests if this input stream supports the <code>mark</code> and
|
||||
* <code>reset</code> methods. The <code>markSupported</code> method of
|
||||
* <code>InputStream</code> returns <code>false</code>.
|
||||
*
|
||||
* @return <code>true</code> if this true type supports the mark and reset
|
||||
* method; <code>false</code> otherwise.
|
||||
* @see java.io.InputStream#mark(int)
|
||||
* @see java.io.InputStream#reset()
|
||||
*/
|
||||
public boolean markSupported() {
|
||||
return true;
|
||||
}
|
||||
|
||||
}
|
||||
@ -0,0 +1,102 @@
|
||||
package org.postgresql.largeobject;
|
||||
|
||||
import java.io.IOException;
|
||||
import java.io.OutputStream;
|
||||
import java.sql.SQLException;
|
||||
|
||||
/**
|
||||
* This implements a basic output stream that writes to a LargeObject
|
||||
*/
|
||||
public class BlobOutputStream extends OutputStream {
|
||||
/**
|
||||
* The parent LargeObject
|
||||
*/
|
||||
private LargeObject lo;
|
||||
|
||||
/**
|
||||
* Buffer
|
||||
*/
|
||||
private byte buf[];
|
||||
|
||||
/**
|
||||
* Size of the buffer (default 1K)
|
||||
*/
|
||||
private int bsize;
|
||||
|
||||
/**
|
||||
* Position within the buffer
|
||||
*/
|
||||
private int bpos;
|
||||
|
||||
/**
|
||||
* Create an OutputStream to a large object
|
||||
* @param lo LargeObject
|
||||
*/
|
||||
public BlobOutputStream(LargeObject lo) {
|
||||
this(lo,1024);
|
||||
}
|
||||
|
||||
/**
|
||||
* Create an OutputStream to a large object
|
||||
* @param lo LargeObject
|
||||
* @param bsize The size of the buffer used to improve performance
|
||||
*/
|
||||
public BlobOutputStream(LargeObject lo,int bsize) {
|
||||
this.lo=lo;
|
||||
this.bsize=bsize;
|
||||
buf=new byte[bsize];
|
||||
bpos=0;
|
||||
}
|
||||
|
||||
public void write(int b) throws java.io.IOException {
|
||||
try {
|
||||
if(bpos>=bsize) {
|
||||
lo.write(buf);
|
||||
bpos=0;
|
||||
}
|
||||
buf[bpos++]=(byte)b;
|
||||
} catch(SQLException se) {
|
||||
throw new IOException(se.toString());
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Flushes this output stream and forces any buffered output bytes
|
||||
* to be written out. The general contract of <code>flush</code> is
|
||||
* that calling it is an indication that, if any bytes previously
|
||||
* written have been buffered by the implementation of the output
|
||||
* stream, such bytes should immediately be written to their
|
||||
* intended destination.
|
||||
*
|
||||
* @exception IOException if an I/O error occurs.
|
||||
*/
|
||||
public void flush() throws IOException {
|
||||
try {
|
||||
if(bpos>0)
|
||||
lo.write(buf,0,bpos);
|
||||
bpos=0;
|
||||
} catch(SQLException se) {
|
||||
throw new IOException(se.toString());
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Closes this output stream and releases any system resources
|
||||
* associated with this stream. The general contract of <code>close</code>
|
||||
* is that it closes the output stream. A closed stream cannot perform
|
||||
* output operations and cannot be reopened.
|
||||
* <p>
|
||||
* The <code>close</code> method of <code>OutputStream</code> does nothing.
|
||||
*
|
||||
* @exception IOException if an I/O error occurs.
|
||||
*/
|
||||
public void close() throws IOException {
|
||||
try {
|
||||
lo.close();
|
||||
lo=null;
|
||||
} catch(SQLException se) {
|
||||
throw new IOException(se.toString());
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
@ -16,7 +16,7 @@ import org.postgresql.fastpath.*;
|
||||
* for this object.
|
||||
*
|
||||
* <p>Normally, client code would use the getAsciiStream, getBinaryStream,
|
||||
* or getUnicodeStream methods in ResultSet, or setAsciiStream,
|
||||
* or getUnicodeStream methods in ResultSet, or setAsciiStream,
|
||||
* setBinaryStream, or setUnicodeStream methods in PreparedStatement to
|
||||
* access Large Objects.
|
||||
*
|
||||
@ -47,21 +47,21 @@ public class LargeObject
|
||||
* Indicates a seek from the begining of a file
|
||||
*/
|
||||
public static final int SEEK_SET = 0;
|
||||
|
||||
|
||||
/**
|
||||
* Indicates a seek from the current position
|
||||
*/
|
||||
public static final int SEEK_CUR = 1;
|
||||
|
||||
|
||||
/**
|
||||
* Indicates a seek from the end of a file
|
||||
*/
|
||||
public static final int SEEK_END = 2;
|
||||
|
||||
|
||||
private Fastpath fp; // Fastpath API to use
|
||||
private int oid; // OID of this object
|
||||
private int fd; // the descriptor of the open large object
|
||||
|
||||
|
||||
/**
|
||||
* This opens a large object.
|
||||
*
|
||||
@ -78,13 +78,13 @@ public class LargeObject
|
||||
{
|
||||
this.fp = fp;
|
||||
this.oid = oid;
|
||||
|
||||
|
||||
FastpathArg args[] = new FastpathArg[2];
|
||||
args[0] = new FastpathArg(oid);
|
||||
args[1] = new FastpathArg(mode);
|
||||
this.fd = fp.getInteger("lo_open",args);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* @return the OID of this LargeObject
|
||||
*/
|
||||
@ -92,7 +92,7 @@ public class LargeObject
|
||||
{
|
||||
return oid;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* This method closes the object. You must not call methods in this
|
||||
* object after this is called.
|
||||
@ -104,7 +104,7 @@ public class LargeObject
|
||||
args[0] = new FastpathArg(fd);
|
||||
fp.fastpath("lo_close",false,args); // true here as we dont care!!
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Reads some data from the object, and return as a byte[] array
|
||||
*
|
||||
@ -120,7 +120,7 @@ public class LargeObject
|
||||
args[0] = new FastpathArg(fd);
|
||||
args[1] = new FastpathArg(len);
|
||||
return fp.getData("loread",args);
|
||||
|
||||
|
||||
// This version allows us to break this down into 4k blocks
|
||||
//if(len<=4048) {
|
||||
//// handle as before, return the whole block in one go
|
||||
@ -145,20 +145,25 @@ public class LargeObject
|
||||
//return buf;
|
||||
//}
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Reads some data from the object into an existing array
|
||||
*
|
||||
* @param buf destination array
|
||||
* @param off offset within array
|
||||
* @param len number of bytes to read
|
||||
* @return the number of bytes actually read
|
||||
* @exception SQLException if a database-access error occurs.
|
||||
*/
|
||||
public void read(byte buf[],int off,int len) throws SQLException
|
||||
public int read(byte buf[],int off,int len) throws SQLException
|
||||
{
|
||||
System.arraycopy(read(len),0,buf,off,len);
|
||||
byte b[] = read(len);
|
||||
if(b.length<len)
|
||||
len=b.length;
|
||||
System.arraycopy(b,0,buf,off,len);
|
||||
return len;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Writes an array to the object
|
||||
*
|
||||
@ -172,7 +177,7 @@ public class LargeObject
|
||||
args[1] = new FastpathArg(buf);
|
||||
fp.fastpath("lowrite",false,args);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Writes some data from an array to the object
|
||||
*
|
||||
@ -187,7 +192,7 @@ public class LargeObject
|
||||
System.arraycopy(buf,off,data,0,len);
|
||||
write(data);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Sets the current position within the object.
|
||||
*
|
||||
@ -206,7 +211,7 @@ public class LargeObject
|
||||
args[2] = new FastpathArg(ref);
|
||||
fp.fastpath("lo_lseek",false,args);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Sets the current position within the object.
|
||||
*
|
||||
@ -220,7 +225,7 @@ public class LargeObject
|
||||
{
|
||||
seek(pos,SEEK_SET);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* @return the current position within the object
|
||||
* @exception SQLException if a database-access error occurs.
|
||||
@ -231,7 +236,7 @@ public class LargeObject
|
||||
args[0] = new FastpathArg(fd);
|
||||
return fp.getInteger("lo_tell",args);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* This method is inefficient, as the only way to find out the size of
|
||||
* the object is to seek to the end, record the current position, then
|
||||
@ -250,7 +255,7 @@ public class LargeObject
|
||||
seek(cp,SEEK_SET);
|
||||
return sz;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Returns an InputStream from this object.
|
||||
*
|
||||
@ -261,9 +266,9 @@ public class LargeObject
|
||||
*/
|
||||
public InputStream getInputStream() throws SQLException
|
||||
{
|
||||
throw org.postgresql.Driver.notImplemented();
|
||||
return new BlobInputStream(this);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Returns an OutputStream to this object
|
||||
*
|
||||
@ -274,6 +279,7 @@ public class LargeObject
|
||||
*/
|
||||
public OutputStream getOutputStream() throws SQLException
|
||||
{
|
||||
throw org.postgresql.Driver.notImplemented();
|
||||
return new BlobOutputStream(this);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
Loading…
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Reference in New Issue
Block a user