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我正在尝试使用 Java 中的准备好的语句执行选择查询。在 Where 子句中,我正在检查时间戳类型列上的条件,如下所示。

String selectSQL = "select * from db.keycontacts WHERE CREATEDDATETIME>?";
PreparedStatement preparedStatement = connect.prepareStatement(selectSQL);
preparedStatement.setTimestamp(1, convertStrToTimestamp(lastSyncTimeStamp));
resultSet = preparedStatement.executeQuery(selectSQL );

//将timestampString转换为java.sql.Timestamp的函数

private java.sql.Timestamp convertStrToTimestamp(String dateTimeStr){

      java.sql.Timestamp timeStampDate = null;
      try {
            DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");//2015-05-11 18:26:55
            java.util.Date dateObj = (java.util.Date)formatter.parse(dateTimeStr);
            timeStampDate = new Timestamp(dateObj.getTime());
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

      return timeStampDate;
  }

执行查询时,出现以下异常。

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '?' at line 1

那么我到底哪里出错了?

提前致谢。

4

1 回答 1

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删除参数

resultSet = preparedStatement.executeQuery(selectSQL );

并更改为

resultSet = preparedStatement.executeQuery( );

您传入的preparedStatement.executeQuery(selectSQL );查询优先于您传入的查询,connect.prepareStatement(selectSQL);后者是您设置任何参数的简单字符串 ( "select * from db.keycontacts WHERE CREATEDDATETIME>?"),因此存在语法错误?

并且您也可以说该语句已准备好,PreparedStatement preparedStatement = connect.prepareStatement(selectSQL);因为它是从StatementexecuteQuery()继承的,它将在不准备的情况下执行查询。

于 2015-05-14T06:15:13.753 回答