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Enhancements to how queries with bind values are stored internally and sent to

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the server.  Previously we allocated a new String object for the entire final
query we were sending to the database.  If you had a big query, or especially
if you had large bind values you ended up with essentially two copies in memory.
This change will reuse the existing objects and therefore should take 1/2 the
memory it does today for a given query.  This restructuring will also allow
in the future the ability to stream bytea data to the server instead of the current approach of pulling it all into memory.
I also fixed a test that was failing on a 7.2 database.
Also renamed some internal variables and some minor cleanup.

 Modified Files:
 	jdbc/org/postgresql/core/QueryExecutor.java
 	jdbc/org/postgresql/jdbc1/AbstractJdbc1Connection.java
 	jdbc/org/postgresql/jdbc1/AbstractJdbc1Statement.java
 	jdbc/org/postgresql/jdbc2/AbstractJdbc2ResultSet.java
 	jdbc/org/postgresql/jdbc2/AbstractJdbc2Statement.java
 	jdbc/org/postgresql/test/jdbc2/DatabaseMetaDataTest.java
This commit is contained in:
Barry Lind
2002-08-23 20:45:49 +00:00
parent a2a3192802
commit fe2dec75a9
6 changed files with 162 additions and 147 deletions
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13
src/interfaces/jdbc/org/postgresql/jdbc2/AbstractJdbc2ResultSet.java
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@ -15,15 +15,13 @@ import org.postgresql.util.PGbytea;
import org.postgresql.util.PSQLException;
/* $Header: /cvsroot/pgsql/src/interfaces/jdbc/org/postgresql/jdbc2/Attic/AbstractJdbc2ResultSet.java,v 1.4 2002/08/14 20:35:39 barry Exp $
/* $Header: /cvsroot/pgsql/src/interfaces/jdbc/org/postgresql/jdbc2/Attic/AbstractJdbc2ResultSet.java,v 1.5 2002/08/23 20:45:49 barry Exp $
* This class defines methods of the jdbc2 specification. This class extends
* org.postgresql.jdbc1.AbstractJdbc1ResultSet which provides the jdbc1
* methods. The real Statement class (for jdbc2) is org.postgresql.jdbc2.Jdbc2ResultSet
*/
public abstract class AbstractJdbc2ResultSet extends org.postgresql.jdbc1.AbstractJdbc1ResultSet {
protected String sqlQuery = null;
//needed for updateable result set support
protected boolean updateable = false;
protected boolean doingUpdates = false;
@ -1254,7 +1252,9 @@ public abstract class AbstractJdbc2ResultSet extends org.postgresql.jdbc1.Abstra
public void parseQuery() {
StringTokenizer st = new StringTokenizer(sqlQuery, " \r\t");
String[] l_sqlFragments = ((AbstractJdbc2Statement)statement).getSqlFragments();
String l_sql = l_sqlFragments[0];
StringTokenizer st = new StringTokenizer(l_sql, " \r\t");
boolean tableFound = false, tablesChecked = false;
String name = "";
@ -1326,11 +1326,6 @@ public abstract class AbstractJdbc2ResultSet extends org.postgresql.jdbc1.Abstra
}
public void setSQLQuery(String sqlQuery) {
this.sqlQuery = sqlQuery;
}
private class PrimaryKey {
int index; // where in the result set is this primaryKey
String name; // what is the columnName of this primary Key