PreparedStatement引发语法错误
我使用PreparedStatements准备查询,当我使用condition参数对查询进行硬编码时,它运行良好。
但如果从setString()方法传递参数,则会抛出错误。
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,我的查询上方看起来不错。
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?
回答:
删除此行中的参数:
rs= pst.executeQuery(query);
一定是
rs= pst.executeQuery();
因为该声明是在 PreparedStatement pst=conn.prepareStatement(query);
execute(String
sql)是从Statement继承的,将在不准备状态的情况下执行状态(sql)。
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