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CHAPTER 11 EXPLORING THE STATEMENT
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11-21. How Do You Execute a Batch of SQL Statements in a Database Using a Statement
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The java.sql package provides the ability to send multiple updates (such as updating records or creating new records) to the database server for execution as a batch. The Statement.addBatch() method enables you to accomplish this task, which might improve the performance of the entire transaction. You can reduce the amount of time it takes to perform repetitive inserts and updates if you batch them using the Statement object s addBatch() method. The signature of addBatch() is as follows: public void addBatch(String sql) throws SQLException This adds the given SQL command to the current list of commands for this Statement object. The commands in this list can be executed as a batch by calling the method executeBatch. Its parameter is sql; typically this is a static SQL INSERT or UPDATE statement. This throws SQLException if a database access error occurs. Both the Oracle and MySQL drivers support the Statement.addBatch() and PreparedStatement. addBatch() methods, which send multiple updates to the database server. With batch updating, a set of SQL statements is assembled and then sent altogether to the database server for execution. Batch updating can improve performance. Using the batch functionality involves two methods (the descriptions of the methods are from the JDK documentation): addBatch(String sql): Adds the given SQL command to the current list of commands for this Statement object. The commands in this list can be executed as a batch by calling the method executeBatch(). executeBatch(): Submits a batch of commands to the database for execution and, if all commands execute successfully, returns an array of update counts. The int elements of the returned array are ordered to correspond to the commands in the batch, which are ordered according to how they were added to the batch. The elements in the array returned by the method executeBatch may be one of the following: A number greater than or equal to zero: Indicates that the command was processed successfully and is an update count giving the number of rows in the database that were affected by the command s execution. A value of SUCCESS_NO_INFO: Indicates that the command was processed successfully but that the number of rows affected is unknown. If one of the commands in a batch update fails to execute properly, this method throws a BatchUpdateException, and a JDBC driver may or may not continue to process the remaining commands in the batch. However, the driver s behavior must be consistent with a particular DBMS, either always continuing to process commands or never continuing to process commands. If the driver continues processing after a failure, the array returned by the method BatchUpdateException. getUpdateCounts will contain as many elements as there are commands in the batch, and at least one of the elements will be a value of EXECUTE_FAILED, which indicates that the command failed to execute successfully and occurs only if a driver continues to process commands after a command fails. This example creates a batch of insert statements. Note that autocommit is disabled, so you have the choice of committing or not committing in the event of an exception. Statement stmt = null; Connection conn = null;
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CHAPTER 11 EXPLORING THE STATEMENT
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try { // get a Connection object conn = getConnection(); // disable autocommit conn.setAutoCommit(false); // the number of statements that can be batched depends on a specific drive stmt = conn.createStatement(); stmt.addBatch("DELETE FROM animals_table"); stmt.addBatch("INSERT INTO animals_table(id, name) VALUES(111, 'ginger')"); stmt.addBatch("INSERT INTO animals_table(id, name) VALUES(222, 'lola')"); stmt.addBatch("INSERT INTO animals_table(id, name) VALUES(333, 'freddy')"); // Execute the batch int[] updateCounts = stmt.executeBatch(); // All statements were successfully executed. // updateCounts array contains one element for // each batched statement; updateCounts[i] contains // the number of rows affected by that statement. checkUpdateCounts(updateCounts); // Since there were no errors, commit conn.commit(); } catch (BatchUpdateException e) { // Not all of the statements were successfully executed int[] updateCounts = e.getUpdateCounts(); // Some databases will continue to execute after one fails. // If so, updateCounts.length will equal the number of // batched statements. If not, updateCounts.length will // equal the number of successfully executed statements checkUpdateCounts(updateCounts); // Either commit the successfully executed statements // or roll back the entire batch conn.rollback(); } catch (SQLException e) { // handle the exception } finally { // close database/JDBC resources such as // ResultSet(s), Statement(s), and Connection(s) } ... public static void checkUpdateCounts(int[] updateCounts) { for (int i=0; i < updateCounts.length; i++) { if (updateCounts[i] >= 0) { // Successfully executed; the number represents number of affected rows System.out.println("Succ. executed; updateCount="+updateCounts[i]); } else if (updateCounts[i] == Statement.SUCCESS_NO_INFO) {
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