如何在JAVA（ResultSet）中检查合并查询是否成功？

Question

我想检查此查询是否返回结果或错误。 我使用next()方法，对于SELECT查询进行同步，它检查是否存在下一行，但是不确定MERGE

public ResultSet example{   
    String sqlQuery = "MERGE INTO bonuses b "
    +"USING ( "
    +"SELECT employee_id, salary, dept_no "
    +"FROM employee@link_to) e "
    +"ON (b.employee_id = e.employee_id) "
    +"WHEN MATCHED THEN "
    +"UPDATE SET b.bonus = e.salary * 0.1 "
    +"WHEN NOT MATCHED THEN "
    +"INSERT (b.employee_id, b.bonus) "
    +"VALUES (e.employee_id, e.salary * 0.05) "

    PreparedStatement stmt = conn.prepareStatement(sql);
    ResultSet rs;
    try {
      rs = stmt.executeQuery();
      Err.errN(rs);
    } finally {

    }
    return rs;
}

Answer 1

您可以尝试以下方法：

........
int affected_rows_number=stmt.executeUpdate("your_query");

affected_rows_number行数显示了受影响的行数。 您可以了解它是否有效或现在。