类用户{

public static void main(String arg[]) throws SQLException {
    Connection con = DBConnect.getConnection();
    con.setAutoCommit(false);
    PreparedStatement pstmt;
    System.out.println(con.getMetaData().supportsSavepoints()); // true
    try {
        pstmt = con.prepareStatement("insert into emp(emp_id, emp_name, salary, address, contact_number)values(?,?,?,?,?)");
        pstmt.setInt(1, 1);
        pstmt.setString(2, "a");
        pstmt.setDouble(3, 8);
        pstmt.setString(4, "s");
        pstmt.setInt(5, 9);
        pstmt.executeUpdate();
        con.commit();
        Savepoint sp = con.setSavepoint();
        if (myMethod(con)) {
            /**
             * I want to rollback the nested transaction if any error occur
             */
            con.rollback(sp);
        }
    } catch (SQLException e) {
        e.printStackTrace();
    }
}

public static boolean myMethod(Connection con) throws SQLException {

    PreparedStatement pstmt;
    try {
        pstmt = con.prepareStatement("insert into emp(emp_id, emp_name, salary, address, contact_number)values(?,?,?,?,?)");
        pstmt.setInt(1, 2);
        pstmt.setString(2, "G");
        pstmt.setDouble(3, 8);
        pstmt.setString(4, "G");
        pstmt.setInt(5, 10);
        pstmt.executeUpdate();
        con.commit();
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return true;
}


}

在上面的代码中,如果任何条件失败,我想回滚嵌套事务。我刚提交第一笔交易后就创建了一个保存点。

java.sql.SQLException: SAVEPOINT _667166fe_13ab4b3e3de__8000 does not exist
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2928)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1571)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1666)
at com.mysql.jdbc.Connection.execSQL(Connection.java:2988)
at com.mysql.jdbc.Statement.executeUpdate(Statement.java:935)
at com.mysql.jdbc.Statement.executeUpdate(Statement.java:873)
at com.mysql.jdbc.Connection.rollback(Connection.java:4777)
at com.User.main(User.java:31)


我想知道嵌套事务是否会回滚吗?

最佳答案

由于您已经在mycc()中的myMethod()方法之前和之后调用了con.commit();,因此没有Savepoint sp = con.setSavepoint();,因此没有任何抱怨。

savepoint请在此处参考文档:


Oracle SAVEPOINT Statement
SQLite Save Point


如果要设置保存点,请删除COMMIT removes all the save points.呼叫。

在代码的当前状态下,无法进行回滚,因为所有事务(如果成功)都将被提交。

10-04 21:34