PreparedStatement抛出语法错误 [英] PreparedStatement throws syntax error

问题描述

我正在使用PreparedStatements准备一个查询，当我用条件参数硬编码查询时它运行正常。

Im preparing a query using PreparedStatements and it runs fine when i hardcode te query with the condition parameter.

但如果参数是从setString传递的，则抛出错误（ ）方法。

but throws error , if the parameter is passed from setString() method.

com.mysql.jdbc.JDBC4PreparedStatement@2cf63e26: select * from linkedin_page_mess ages where company_id = '2414183' 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

在错误日志中，我的查询上面看起来很好。

In the error log, above my query looks fine.

public JSONObject getLinkedInMessages(String compId)
    {
            linlogger.log(Level.INFO, "Called getLinkedInMessages method");
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;

        JSONObject resObj = new JSONObject();
        JSONArray tempArray = new JSONArray();
        try
        {
            conn = InitOrGetConnection();
            String query = "select * from linkedin_page_messages where company_id = ?";
            PreparedStatement pst=conn.prepareStatement(query);
            pst.setString(1, compId);
            System.out.println("\n\n"+pst.toString());
            rs= pst.executeQuery(query);


             // process resultset logics
        }
       catch(Exception e)
        {   
            System.out.println(e);
            linlogger.log(Level.INFO, "Exception occured "+e.toString());
        }
    }

PreparedStatements有什么问题吗？

Is there anything wrong with the PreparedStatements?

推荐答案

删除此行中的参数：

rs= pst.executeQuery(query);

必须

rs= pst.executeQuery();

因为语句是在 PreparedStatement pst = conn.prepareStatement（query）准备的;

execute（String sql）继承自语句并将执行声明（sql）没有准备好。

execute(String sql) is inherited from Statement and will execute the satement (sql) without prepared it.

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