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HSQLDB - Lightweight 100% Java SQL Database Engine
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package org.hsqldb.test;

import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;

import org.hsqldb.lib.ArrayUtil;
import org.hsqldb.trigger.Trigger;

/**
 *
 * @author fredt
 */
public class TestTriggers extends TestBase {

    Connection conn;
    private static String dbPath = "/hsql/testtrig/trigs";

    public TestTriggers(String testName) {
        super(testName, "jdbc:hsqldb:file:" + dbPath, false, false);
        TestUtil.deleteDatabase(dbPath);
    }

    public void setUp() throws Exception {

        super.setUp();

        try {
            openConnection();
        } catch (SQLException ex) {
            throw new RuntimeException(ex);
        }
    }

    public void tearDown() {

        try {
            conn.close();
        } catch (SQLException ex) {
            throw new RuntimeException(ex);
        }

        super.tearDown();
    }

    public void testTriggerAction() {

        runScript();

        try {
            runStatements();
        } catch (SQLException e) {
            e.printStackTrace();
            assertTrue(false);
        }

        try {
            shutdownDatabase();
        } catch (SQLException e) {
            e.printStackTrace();
            assertTrue(false);
        }

        try {
            openConnection();
        } catch (SQLException e) {
            e.printStackTrace();
            assertTrue(false);
        }

        try {
            runStatements();
        } catch (SQLException e) {
            e.printStackTrace();
            assertTrue(false);
        }
    }

    public void testTriggerCondition() {

    }

    private void openConnection() throws SQLException {
        conn = newConnection();
    }

    private void runScript() {
        TestUtil.testScript(conn, "testrun/hsqldb/TestTriggers.txt");
    }

    private void shutdownDatabase() throws SQLException {

        Statement st = conn.createStatement();

        st.execute("shutdown");
        st.close();
    }

    private void runStatements() throws SQLException {

        Statement st = conn.createStatement();

        st.execute("delete from testtrig");
        st.execute("alter table testtrig alter column c1 restart with 0");
        clearCalls();
        st.execute(
            "insert into testtrig values (default, 'inserted val 1', 100)");
        checkCallCount(3);
        checkCalls(Trigger.INSERT_AFTER, 1);
        checkCalls(Trigger.INSERT_BEFORE_ROW, 1);
        checkCalls(Trigger.INSERT_AFTER_ROW, 1);
        clearCalls();
        st.execute(
            "insert into testtrig (c2, c3) select c2, c3 from testtrig where c1 < 0");
        checkCallCount(1);
        checkCalls(Trigger.INSERT_AFTER, 1);
        checkCalls(Trigger.INSERT_BEFORE_ROW, 0);
        checkCalls(Trigger.INSERT_AFTER_ROW, 0);
        clearCalls();
        st.execute("update testtrig set c2 = c2 || ' updated' where c1 = 0");
        checkCallCount(3);
        checkCalls(Trigger.UPDATE_AFTER, 1);
        checkCalls(Trigger.UPDATE_BEFORE_ROW, 1);
        checkCalls(Trigger.UPDATE_AFTER_ROW, 1);
        clearCalls();
        st.execute("update testtrig set c2 = c2 || ' updated' where c1 < 0");
        checkCallCount(1);
        checkCalls(Trigger.UPDATE_AFTER, 1);
        checkCalls(Trigger.UPDATE_BEFORE_ROW, 0);
        checkCalls(Trigger.UPDATE_AFTER_ROW, 0);
        clearCalls();
        st.execute("update testtrig set c2 = null where c1 = 0");
        checkCallCount(1);
        checkCalls(Trigger.UPDATE_AFTER, 1);
        checkCalls(Trigger.UPDATE_BEFORE_ROW, 0);
        checkCalls(Trigger.UPDATE_AFTER_ROW, 0);
        st.close();
    }

    void checkCalls(int trigType, int callCount) {
        assertEquals("call count mismatch", TriggerClass.callCounts[trigType],
                     callCount);
    }

    void clearCalls() {

        TriggerClass.callCount = 0;

        ArrayUtil.fillArray(TriggerClass.callCounts, 0);
    }

    void checkCallCount(int count) {
        assertEquals("trigger call mismatch", count, TriggerClass.callCount);
    }
}