无法在H2 DB中调用触发器
我尝试运行一个简单的类从Java代码调用TRIGGER，我使用H2 DB，你能帮助我吗？ 这是我的简单代码（如H2中的示例代码）：
public class TriggerTest { public static void main(String[] args) throws Exception { System.out.println(TriggerTest.MyTrigger.class.getName()); Class.forName("org.h2.Driver"); Connection conn = DriverManager.getConnection("jdbc:h2:tcp://localhost/~/chap1", "sa", "sa"); Statement stat = conn.createStatement(); stat.execute("Drop Table if exists INVOICE"); stat.execute("Drop Table if exists INVOICE_SUM"); stat.execute("CREATE TABLE INVOICE(ID INT PRIMARY KEY, AMOUNT DECIMAL)"); stat.execute("CREATE TABLE INVOICE_SUM(AMOUNT DECIMAL)"); stat.execute("INSERT INTO INVOICE_SUM VALUES(0.0)"); stat.execute("CREATE TRIGGER INV_INS AFTER INSERT ON INVOICE FOR EACH ROW CALL \""+TriggerTest.MyTrigger.class.getName()+"\""); stat.execute("CREATE TRIGGER INV_UPD AFTER UPDATE ON INVOICE FOR EACH ROW CALL \""+TriggerTest.MyTrigger.class.getName()+"\""); stat.execute("CREATE TRIGGER INV_DEL AFTER DELETE ON INVOICE FOR EACH ROW CALL \""+TriggerTest.MyTrigger.class.getName()+"\""); stat.execute("INSERT INTO INVOICE VALUES(1, 10.0)"); stat.execute("INSERT INTO INVOICE VALUES(2, 19.95)"); stat.execute("UPDATE INVOICE SET AMOUNT=20.0 WHERE ID=2"); stat.execute("DELETE FROM INVOICE WHERE ID=1"); ResultSet rs; rs = stat.executeQuery("SELECT AMOUNT FROM INVOICE_SUM"); rs.next(); System.out.println("The sum is " + rs.getBigDecimal(1)); conn.close(); } public static class MyTrigger implements Trigger { public void init(Connection conn, String schemaName, String triggerName, String tableName, boolean before, int type) { // Initializing trigger } public void fire(Connection conn, Object[] oldRow, Object[] newRow) throws SQLException { BigDecimal diff = null; if (newRow != null) { diff = (BigDecimal) newRow[1]; } if (oldRow != null) { BigDecimal m = (BigDecimal) oldRow[1]; diff = diff == null ? m.negate() : diff.subtract(m); } PreparedStatement prep = conn.prepareStatement( "UPDATE INVOICE_SUM SET AMOUNT=AMOUNT+?"); prep.setBigDecimal(1, diff); prep.execute(); } } 和错误：线程“main”中的exceptionorg.h2.jdbc.JdbcSQLException：创建或初始化触发器“INV_INS”对象，类“vn.com.khangpn.core.trigger.TriggerTest $ MyTrigger”时出错：原因：“org.h2 .message.DbException：Class“”vn.com.khangpn.core.trigger.TriggerTest $ MyTrigger“”not found [90086-169]“; 详细了解根本原因; SQL语句：
在H2中， 触发器类必须在数据库引擎的类路径中可用（使用服务器模式时，它必须位于服务器的类路径中）。