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patch to add support for callable statements to the jdbc driver. The patch was submitted by Paul Bethe pmbethe@yahoo.com

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This commit is contained in:
Barry Lind
2002-06-24 06:16:27 +00:00
parent 33086553c0
commit 12a28d12bb
6 changed files with 396 additions and 42 deletions
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288
src/interfaces/jdbc/org/postgresql/jdbc2/CallableStatement.java
View File

@ -7,7 +7,7 @@ package org.postgresql.jdbc2;
import java.sql.*;
import java.math.*;
import org.postgresql.util.*;
/*
* CallableStatement is used to execute SQL stored procedures.
*
@ -37,6 +37,7 @@ import java.math.*;
*
* @see Connection#prepareCall
* @see ResultSet
* @author Paul Bethe (implementer)
*/
public class CallableStatement extends org.postgresql.jdbc2.PreparedStatement implements java.sql.CallableStatement
@ -46,9 +47,74 @@ public class CallableStatement extends org.postgresql.jdbc2.PreparedStatement im
*/
public CallableStatement(Connection c, String q) throws SQLException
{
super(c, q);
super(c, q); // don't parse yet..
}
/**
* allows this class to tweak the standard JDBC call !see Usage
* -> and replace with the pgsql function syntax
* ie. select <function ([params])> as RESULT;
*/
protected void parseSqlStmt () throws SQLException {
modifyJdbcCall ();
super.parseSqlStmt ();
}
/**
* this method will turn a string of the form
* {? = call <some_function> (?, [?,..]) }
* into the PostgreSQL format which is
* select <some_function> (?, [?, ...]) as result
*
*/
private void modifyJdbcCall () throws SQLException {
// syntax checking is not complete only a few basics :(
originalSql = sql; // save for error msgs..
int index = sql.indexOf ("="); // is implied func or proc?
boolean isValid = true;
if (index != -1) {
isFunction = true;
isValid = sql.indexOf ("?") < index; // ? before =
}
sql = sql.trim ();
if (sql.startsWith ("{") && sql.endsWith ("}")) {
sql = sql.substring (1, sql.length() -1);
} else isValid = false;
index = sql.indexOf ("call");
if (index == -1 || !isValid)
throw new PSQLException ("postgresql.call.malformed",
new Object[]{sql, JDBC_SYNTAX});
sql = sql.replace ('{', ' '); // replace these characters
sql = sql.replace ('}', ' ');
sql = sql.replace (';', ' ');
// this removes the 'call' string and also puts a hidden '?'
// at the front of the line for functions, this will
// allow the registerOutParameter to work correctly
// because in the source sql there was one more ? for the return
// value that is not needed by the postgres syntax. But to make
// sure that the parameter numbers are the same as in the original
// sql we add a dummy parameter in this case
sql = (isFunction ? "?" : "") + sql.substring (index + 4);
sql = "select " + sql + " as " + RESULT_COLUMN + ";";
}
// internals
static final String JDBC_SYNTAX = "{[? =] call <some_function> ([? [,?]*]) }";
static final String RESULT_COLUMN = "result";
String originalSql = "";
boolean isFunction;
// functionReturnType contains the user supplied value to check
// testReturn contains a modified version to make it easier to
// check the getXXX methods..
int functionReturnType;
int testReturn;
// returnTypeSet is true when a proper call to registerOutParameter has been made
boolean returnTypeSet;
Object result;
/*
* Before executing a stored procedure call you must explicitly
* call registerOutParameter to register the java.sql.Type of each
@ -58,6 +124,8 @@ public class CallableStatement extends org.postgresql.jdbc2.PreparedStatement im
* the getXXX method whose Java type XXX corresponds to the
* parameter's registered SQL type.
*
* ONLY 1 RETURN PARAMETER if {?= call ..} syntax is used
*
* @param parameterIndex the first parameter is 1, the second is 2,...
* @param sqlType SQL type code defined by java.sql.Types; for
* parameters of type Numeric or Decimal use the version of
@ -65,7 +133,55 @@ public class CallableStatement extends org.postgresql.jdbc2.PreparedStatement im
* @exception SQLException if a database-access error occurs.
*/
public void registerOutParameter(int parameterIndex, int sqlType) throws SQLException
{}
{
if (parameterIndex != 1)
throw new PSQLException ("postgresql.call.noinout");
if (!isFunction)
throw new PSQLException ("postgresql.call.procasfunc", originalSql);
// functionReturnType contains the user supplied value to check
// testReturn contains a modified version to make it easier to
// check the getXXX methods..
functionReturnType = sqlType;
testReturn = sqlType;
if (functionReturnType == Types.CHAR ||
functionReturnType == Types.LONGVARCHAR)
testReturn = Types.VARCHAR;
else if (functionReturnType == Types.FLOAT)
testReturn = Types.REAL; // changes to streamline later error checking
returnTypeSet = true;
}
/**
* allow calls to execute update
* @return 1 if succesful call otherwise 0
*/
public int executeUpdate() throws SQLException
{
java.sql.ResultSet rs = super.executeQuery (compileQuery());
if (isFunction) {
if (!rs.next ())
throw new PSQLException ("postgresql.call.noreturnval");
result = rs.getObject(1);
int columnType = rs.getMetaData().getColumnType(1);
if (columnType != functionReturnType)
throw new PSQLException ("postgresql.call.wrongrtntype",
new Object[]{
getSqlTypeName (columnType), getSqlTypeName (functionReturnType) });
}
rs.close ();
return 1;
}
/**
* allow calls to execute update
* @return true if succesful
*/
public boolean execute() throws SQLException
{
return (executeUpdate() == 1);
}
/*
* You must also specify the scale for numeric/decimal types:
@ -82,12 +198,40 @@ public class CallableStatement extends org.postgresql.jdbc2.PreparedStatement im
*/
public void registerOutParameter(int parameterIndex, int sqlType,
int scale) throws SQLException
{}
{
registerOutParameter (parameterIndex, sqlType); // ignore for now..
}
// Old api?
//public boolean isNull(int parameterIndex) throws SQLException {
//return true;
//}
/*
* override this method to check for set @ 1 when declared function..
*
* @param paramIndex the index into the inString
* @param s a string to be stored
* @exception SQLException if something goes wrong
*/
protected void set(int paramIndex, String s) throws SQLException
{
if (paramIndex == 1 && isFunction) // need to registerOut instead
throw new PSQLException ("postgresql.call.funcover");
super.set (paramIndex, s); // else set as usual..
}
/*
* Helper - this compiles the SQL query from the various parameters
* This is identical to toString() except it throws an exception if a
* parameter is unused.
*/
protected synchronized String compileQuery()
throws SQLException
{
if (isFunction && !returnTypeSet)
throw new PSQLException("postgresql.call.noreturntype");
if (isFunction) { // set entry 1 to dummy entry..
inStrings[0] = ""; // dummy entry which ensured that no one overrode
// and calls to setXXX (2,..) really went to first arg in a function call..
}
return super.compileQuery ();
}
/*
* An OUT parameter may have the value of SQL NULL; wasNull
@ -101,14 +245,9 @@ public class CallableStatement extends org.postgresql.jdbc2.PreparedStatement im
public boolean wasNull() throws SQLException
{
// check to see if the last access threw an exception
return false; // fake it for now
return (result == null);
}
// Old api?
//public String getChar(int parameterIndex) throws SQLException {
//return null;
//}
/*
* Get the value of a CHAR, VARCHAR, or LONGVARCHAR parameter as a
* Java String.
@ -119,7 +258,8 @@ public class CallableStatement extends org.postgresql.jdbc2.PreparedStatement im
*/
public String getString(int parameterIndex) throws SQLException
{
return null;
checkIndex (parameterIndex, Types.VARCHAR, "String");
return (String)result;
}
//public String getVarChar(int parameterIndex) throws SQLException {
// return null;
@ -138,7 +278,9 @@ public class CallableStatement extends org.postgresql.jdbc2.PreparedStatement im
*/
public boolean getBoolean(int parameterIndex) throws SQLException
{
return false;
checkIndex (parameterIndex, Types.BIT, "Boolean");
if (result == null) return false;
return ((Boolean)result).booleanValue ();
}
/*
@ -150,7 +292,9 @@ public class CallableStatement extends org.postgresql.jdbc2.PreparedStatement im
*/
public byte getByte(int parameterIndex) throws SQLException
{
return 0;
checkIndex (parameterIndex, Types.TINYINT, "Byte");
if (result == null) return 0;
return (byte)((Integer)result).intValue ();
}
/*
@ -162,8 +306,11 @@ public class CallableStatement extends org.postgresql.jdbc2.PreparedStatement im
*/
public short getShort(int parameterIndex) throws SQLException
{
return 0;
checkIndex (parameterIndex, Types.SMALLINT, "Short");
if (result == null) return 0;
return (short)((Integer)result).intValue ();
}
/*
* Get the value of an INTEGER parameter as a Java int.
@ -174,7 +321,9 @@ public class CallableStatement extends org.postgresql.jdbc2.PreparedStatement im
*/
public int getInt(int parameterIndex) throws SQLException
{
return 0;
checkIndex (parameterIndex, Types.INTEGER, "Int");
if (result == null) return 0;
return ((Integer)result).intValue ();
}
/*
@ -186,7 +335,9 @@ public class CallableStatement extends org.postgresql.jdbc2.PreparedStatement im
*/
public long getLong(int parameterIndex) throws SQLException
{
return 0;
checkIndex (parameterIndex, Types.BIGINT, "Long");
if (result == null) return 0;
return ((Long)result).longValue ();
}
/*
@ -198,7 +349,9 @@ public class CallableStatement extends org.postgresql.jdbc2.PreparedStatement im
*/
public float getFloat(int parameterIndex) throws SQLException
{
return (float) 0.0;
checkIndex (parameterIndex, Types.REAL, "Float");
if (result == null) return 0;
return ((Float)result).floatValue ();
}
/*
@ -210,7 +363,9 @@ public class CallableStatement extends org.postgresql.jdbc2.PreparedStatement im
*/
public double getDouble(int parameterIndex) throws SQLException
{
return 0.0;
checkIndex (parameterIndex, Types.DOUBLE, "Double");
if (result == null) return 0;
return ((Double)result).doubleValue ();
}
/*
@ -227,7 +382,8 @@ public class CallableStatement extends org.postgresql.jdbc2.PreparedStatement im
public BigDecimal getBigDecimal(int parameterIndex, int scale)
throws SQLException
{
return null;
checkIndex (parameterIndex, Types.NUMERIC, "BigDecimal");
return ((BigDecimal)result);
}
/*
@ -240,7 +396,8 @@ public class CallableStatement extends org.postgresql.jdbc2.PreparedStatement im
*/
public byte[] getBytes(int parameterIndex) throws SQLException
{
return null;
checkIndex (parameterIndex, Types.VARBINARY, "Bytes");
return ((byte [])result);
}
// New API (JPM) (getLongVarBinary)
@ -257,7 +414,8 @@ public class CallableStatement extends org.postgresql.jdbc2.PreparedStatement im
*/
public java.sql.Date getDate(int parameterIndex) throws SQLException
{
return null;
checkIndex (parameterIndex, Types.DATE, "Date");
return (java.sql.Date)result;
}
/*
@ -269,7 +427,8 @@ public class CallableStatement extends org.postgresql.jdbc2.PreparedStatement im
*/
public java.sql.Time getTime(int parameterIndex) throws SQLException
{
return null;
checkIndex (parameterIndex, Types.TIME, "Time");
return (java.sql.Time)result;
}
/*
@ -282,7 +441,8 @@ public class CallableStatement extends org.postgresql.jdbc2.PreparedStatement im
public java.sql.Timestamp getTimestamp(int parameterIndex)
throws SQLException
{
return null;
checkIndex (parameterIndex, Types.TIMESTAMP, "Timestamp");
return (java.sql.Timestamp)result;
}
//----------------------------------------------------------------------
@ -317,7 +477,8 @@ public class CallableStatement extends org.postgresql.jdbc2.PreparedStatement im
public Object getObject(int parameterIndex)
throws SQLException
{
return null;
checkIndex (parameterIndex);
return result;
}
// ** JDBC 2 Extensions **
@ -327,9 +488,10 @@ public class CallableStatement extends org.postgresql.jdbc2.PreparedStatement im
throw org.postgresql.Driver.notImplemented();
}
public java.math.BigDecimal getBigDecimal(int i) throws SQLException
public java.math.BigDecimal getBigDecimal(int parameterIndex) throws SQLException
{
throw org.postgresql.Driver.notImplemented();
checkIndex (parameterIndex, Types.NUMERIC, "BigDecimal");
return ((BigDecimal)result);
}
public Blob getBlob(int i) throws SQLException
@ -367,10 +529,76 @@ public class CallableStatement extends org.postgresql.jdbc2.PreparedStatement im
throw org.postgresql.Driver.notImplemented();
}
// no custom types allowed yet..
public void registerOutParameter(int parameterIndex, int sqlType, String typeName) throws SQLException
{
throw org.postgresql.Driver.notImplemented();
}
/** helperfunction for the getXXX calls to check isFunction and index == 1
*/
private void checkIndex (int parameterIndex, int type, String getName)
throws SQLException {
checkIndex (parameterIndex);
if (type != this.testReturn)
throw new PSQLException("postgresql.call.wrongget",
new Object[]{getSqlTypeName (testReturn),
getName,
getSqlTypeName (type)});
}
/** helperfunction for the getXXX calls to check isFunction and index == 1
* @param parameterIndex index of getXXX (index)
* check to make sure is a function and index == 1
*/
private void checkIndex (int parameterIndex) throws SQLException {
if (!isFunction)
throw new PSQLException("postgresql.call.noreturntype");
if (parameterIndex != 1)
throw new PSQLException("postgresql.call.noinout");
}
/** helper function for creating msg with type names
* @param sqlType a java.sql.Types.XX constant
* @return String which is the name of the constant..
*/
private static String getSqlTypeName (int sqlType) {
switch (sqlType)
{
case Types.BIT:
return "BIT";
case Types.SMALLINT:
return "SMALLINT";
case Types.INTEGER:
return "INTEGER";
case Types.BIGINT:
return "BIGINT";
case Types.NUMERIC:
return "NUMERIC";
case Types.REAL:
return "REAL";
case Types.DOUBLE:
return "DOUBLE";
case Types.FLOAT:
return "FLOAT";
case Types.CHAR:
return "CHAR";
case Types.VARCHAR:
return "VARCHAR";
case Types.DATE:
return "DATE";
case Types.TIME:
return "TIME";
case Types.TIMESTAMP:
return "TIMESTAMP";
case Types.BINARY:
return "BINARY";
case Types.VARBINARY:
return "VARBINARY";
default:
return "UNKNOWN";
}
}
}

11
src/interfaces/jdbc/org/postgresql/jdbc2/Connection.java
View File

@ -17,7 +17,7 @@ import org.postgresql.largeobject.*;
import org.postgresql.util.*;
/*
* $Id: Connection.java,v 1.19 2002/06/11 02:55:16 barry Exp $
* $Id: Connection.java,v 1.20 2002/06/24 06:16:27 barry Exp $
*
* A Connection represents a session with a specific database. Within the
* context of a Connection, SQL statements are executed and results are
@ -135,11 +135,10 @@ public class Connection extends org.postgresql.Connection implements java.sql.Co
public java.sql.CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency) throws SQLException
{
throw new PSQLException("postgresql.con.call");
//CallableStatement s = new CallableStatement(this,sql);
//s.setResultSetType(resultSetType);
//s.setResultSetConcurrency(resultSetConcurrency);
//return s;
CallableStatement s = new CallableStatement(this,sql);
s.setResultSetType(resultSetType);
s.setResultSetConcurrency(resultSetConcurrency);
return s;
}
/*

13
src/interfaces/jdbc/org/postgresql/jdbc2/PreparedStatement.java
View File

@ -58,13 +58,16 @@ public class PreparedStatement extends Statement implements java.sql.PreparedSta
{
super(connection);
this.sql = sql;
this.connection = connection;
parseSqlStmt (); // this allows Callable stmt to override
}
protected void parseSqlStmt () throws SQLException {
Vector v = new Vector();
boolean inQuotes = false;
int lastParmEnd = 0, i;
this.sql = sql;
this.connection = connection;
for (i = 0; i < sql.length(); ++i)
{
int c = sql.charAt(i);
@ -118,7 +121,7 @@ public class PreparedStatement extends Statement implements java.sql.PreparedSta
* This is identical to toString() except it throws an exception if a
* parameter is unused.
*/
private synchronized String compileQuery()
protected synchronized String compileQuery()
throws SQLException
{
sbuf.setLength(0);
@ -818,7 +821,7 @@ public class PreparedStatement extends Statement implements java.sql.PreparedSta
* @param s a string to be stored
* @exception SQLException if something goes wrong
*/
private void set(int paramIndex, String s) throws SQLException
protected void set(int paramIndex, String s) throws SQLException
{
if (paramIndex < 1 || paramIndex > inStrings.length)
throw new PSQLException("postgresql.prep.range");