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CHAPTER 5 STATEMENT AND PREPAREDSTATEMENT
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When we execute the preceding program with table t1 empty, we get the following output: B:\>java DemoStandardUpdateBatching ora10g URL:jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(PORT=1521)(HOST=rmeno n-lap))(CONNECT_DATA=(SID=ora10g))) Inserted 3 rows successfully If we execute it again, we will get an error, because x is a primary key: B:\>java DemoStandardUpdateBatching ora10g URL:jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(PORT=1521)(HOST=rmeno n-lap))(CONNECT_DATA=(SID=ora10g))) Error in standard batch update - Found a value of -3 in the update count array f or statement number 0 Error in standard batch update - Found a value of -3 in the update count array f or statement number 1 Error in standard batch update - Found a value of -3 in the update count array f or statement number 2 Exception caught! Exiting .. error message: ORA-00001: unique constraint (BENCHMARK.SYS_C005873) violated java.sql.BatchUpdateException: ORA-00001: unique constraint (BENCHMARK.SYS_C0058 73) violated Regardless of how many rows result in an error, the Oracle JDBC driver puts a value of 3 (indicating failure) in the update count for all of the rows. Let s now turn our attention to Oracle update batching.
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With Oracle update batching, the first step is to define a batch value, which is the number of operations you want to process per round-trip. You can set this batch value in two ways: By invoking the setDefaultExecuteBatch() method on the OracleConnection object: public void setDefaultExecuteBatch(int); This sets the batch size on all the statements associated with the connection to the specified value. As you may have guessed, there is a corresponding getDefault ExecuteBatch() method available in the OracleConnection interface as well. By invoking the setExecuteBatch() method on the OraclePreparedStatement object:
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public void setExecuteBatch(int); This sets the batch size on a particular statement and is usually the way applications use the batching feature. A corresponding getExecuteBatch() method is available in the OraclePreparedStatement interface as well. Remember that the statement-level batch overrides the one set at the connection level.
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If you want to explicitly execute accumulated operations before the batch value in effect is reached, then you can use the sendBatch() method of the OraclePreparedStatement interface, which returns the number of operations successfully completed: public int sendBatch(int); Just as in the case of standard update batching, you can clear the current batch of operations instead of executing it by using the clearBatch() method of the Statement interface. A clearBatch() essentially resets the batch contents to empty. public void clearBatch();
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In this section, we ll look at an example that illustrates Oracle update batching. The DemoOracleUpdateBatching class begins with the import statements and the main() method declaration. Within the main() method, we obtain the connection as usual: /* This program illustrates use of Oracle update batching. * COMPATIBLITY NOTE: runs successfully against 10.1.0.2.0. and 9.2.0.1.0. */ import java.sql.SQLException; import java.sql.Statement; // for accessing constants only import oracle.jdbc.OraclePreparedStatement; import oracle.jdbc.OracleConnection; import book.util.JDBCUtil; import book.util.Util; class DemoOracleUpdateBatching { public static void main(String args[]) { Util.checkProgramUsage( args ); OracleConnection oconn = null; OraclePreparedStatement opstmt = null; try { // get connection, set it to autocommit within JDBCUtil.getConnection() oconn = (OracleConnection)JDBCUtil.getConnection( "benchmark", "benchmark", args[0]); We prepare an insert statement, casting the returned object to the OraclePreparedStatement interface: // prepare a statement to insert data opstmt = (OraclePreparedStatement) oconn.prepareStatement( "insert into t1( x ) values ( )"); We set the batch size to 3 at the statement level: opstmt.setExecuteBatch( 3 );
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We then insert three rows, printing out the number of rows returned each time. Since the batch size is 3, Oracle queues up the batches and executes them all together with the third insert. // first insert opstmt.setInt(1, 1 ); // following insert is queued for execution by JDBC int numOfRowsInserted = opstmt.executeUpdate(); System.out.println("num of rows inserted: " + numOfRowsInserted ); // second insert opstmt.setInt(1, 2 ); // following insert is queued for execution by JDBC numOfRowsInserted = opstmt.executeUpdate(); System.out.println("num of rows inserted: " + numOfRowsInserted ); // third insert opstmt.setInt(1, 3 ); // since batch size is 3, the following insert will result // in JDBC sending all three inserts queued so far (including // the one below) for execution numOfRowsInserted = opstmt.executeUpdate(); System.out.println("num of rows inserted: " + numOfRowsInserted ); We next insert another row. This insert will get queued again in a fresh batch. // fourth insert opstmt.setInt(1, 4 ); // following insert is queued for execution by JDBC numOfRowsInserted = opstmt.executeUpdate(); System.out.println("num of rows inserted: " + numOfRowsInserted ); We send this batch explicitly using the sendBatch() method: // now if you want to explicitly send the batch, you can // use the sendBatch() method as shown below. numOfRowsInserted = opstmt.sendBatch(); System.out.println("num of rows sent for batch: " + numOfRowsInserted ); Finally, we commit our transaction and end the program: oconn.commit(); } catch (Exception e) { // handle the exception properly - in this case, we just // print a message and roll back JDBCUtil.printExceptionAndRollback( oconn, e ); } finally { // close the result set, statement, and connection.
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