insert时返回键值

通过java，insert数据时返回键值。

结论

1. 不仅可以返回主键，还可以返回具体某列的值。
2. 只能作用于简单的insert的语句，insert select、merge语句不支持（只测试过ojdbc-14.jar）
3. 不支持batch批处理

实例

package database;
//import 略
public class ConnectionTest {

    private static String dbDriver = "oracle.jdbc.driver.OracleDriver";
    private static String dbURL = "jdbc:oracle:thin:@localhost:1521:orcl";
    private static String dbUser = "testuser";
    private static String dbPwd = "testuser";

    private static Connection con;
    private static Statement sm = null;
    private static PreparedStatement ps = null;
    private static ResultSet rs = null;

    private String insertSqlStr = "insert into testtable values(testseq.nextVal, " +
            "testseq.nextVal + 100, testseq.nextVal + 1000)";
    @BeforeClass 
    public static  void initCon() {
        try {
            Class.forName(dbDriver);
            con = DriverManager.getConnection(dbURL, dbUser, dbPwd);
            con.setAutoCommit(false);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }

    }

    @AfterClass 
    public static void close() {
        try {
            con.rollback();
            con.close();
            if (sm != null) {
                sm.close();
            }
            if (ps != null) {
                ps.close();
            }
            if (rs != null) {
                rs.close();
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }

    }

    @Test(expected= SQLException.class)
    public void statementTest1() throws SQLException {
        sm = con.createStatement();
        sm.execute(insertSqlStr);
        rs = sm.getGeneratedKeys();
    }

    //默认返回rowid
    @Test
    public void statementTest2() throws SQLException {
        sm = con.createStatement();
        sm.execute(insertSqlStr, Statement.RETURN_GENERATED_KEYS);
        rs = sm.getGeneratedKeys();
        printResultSet(rs);
    }

    @Test
    public void statementTest3() throws SQLException {
        sm = con.createStatement();
        sm.execute(insertSqlStr, new int[]{1, 2, 3});
        rs = sm.getGeneratedKeys();
        printResultSet(rs);
    }

    @Test
    public void statementTest4() throws SQLException {
        sm = con.createStatement();
        sm.execute(insertSqlStr, new String[]{"ID", "COL1", "COL2"});
        rs = sm.getGeneratedKeys();
        printResultSet(rs);
    }

    @Test(expected= SQLException.class)
    public void prepareStatementTest1() throws SQLException {
        ps = con.prepareStatement(insertSqlStr);
        ps.execute();
        rs = ps.getGeneratedKeys();
    }

    //默认返回rowid
    @Test
    public void prepareStatementTest2() throws SQLException {
        ps = con.prepareStatement(insertSqlStr, Statement.RETURN_GENERATED_KEYS);
        ps.execute();
        rs = ps.getGeneratedKeys();
        printResultSet(rs);
    }

    @Test
    public void prepareStatementTest3() throws SQLException {
        ps = con.prepareStatement(insertSqlStr, new int[]{1, 2, 3});
        ps.executeUpdate();
        rs = ps.getGeneratedKeys();
        printResultSet(rs);
    }

    @Test
    public void prepareStatementTest4() throws SQLException {
        ps = con.prepareStatement(insertSqlStr, new String[]{"ID", "COL1", "COL2"});
        ps.executeUpdate();
        rs = ps.getGeneratedKeys();
        printResultSet(rs);
    }

    //批处理不支持返回指定col值
    @Test
    public void batch1() throws SQLException {
        ps = con.prepareStatement("insert into testtable values(testseq.nextVal, ?, ?)",
                new String[]{"ID", "COL1", "COL2"});
        ps.setInt(1, 101);
        ps.setInt(2, 1001);
        ps.addBatch();
        ps.setInt(1, 102);
        ps.setInt(2, 1002);
        ps.addBatch();
        ps.executeBatch();
//      rs = ps.getGeneratedKeys();
//      printResultSet(rs);
    }



    private void printResultSet(ResultSet resultSet) {
        StringBuffer priBuffer;
        try {
            while(resultSet.next()) {
                ResultSetMetaData rsmd = rs.getMetaData();
                priBuffer = new StringBuffer();
                for (int i = 1, len = rsmd.getColumnCount(); i <= len; i++) {
                    priBuffer.append(rsmd.getColumnName(i)).append(": ")
                        .append(resultSet.getObject(i)).append("  ");
                }
                System.out.println(priBuffer.toString());
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

spring jdbc 相关API

spring 内部实现是也是基于上面实例