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The program is not accepting the query given below-

 public class loginDaos {

       public void create(loginBean bean) {
           ConnectionPool c = ConnectionPool.getInstance();
           c.initialize();
           Connection con = c.getConnection();
           try {
               String sql = "INSERT INTO login VALUES(?,?,?,?)";
               PreparedStatement pstmt = con.prepareStatement(sql);
               pstmt.setString(1, bean.getCode());
               pstmt.setString(2, bean.getUserid());
               pstmt.setString(3, bean.getPassword());
               pstmt.setString(4, bean.getPosition());
               pstmt.executeUpdate(sql);
           }
       } catch (Exception e) {
           e.printStackTrace();
       }
   }


   public static void main(String args[]) {
       loginDaos ld = new loginDaos();
       loginBean lb = new loginBean("representative", "rep7", "rep7", "r");
       ld.create(lb);

   }
   }

The table is:

 CREATE TABLE login
( userid char(25);
  password varchar(45),
  code char(5),
  position char(),
  PRIMARY KEY (code)
 );

I have currently kept the value of userid,password, code and position as String.The stack trace is:

 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
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
    at com.mysql.jdbc.Util.getInstance(Util.java:381)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1030)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3491)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3423)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1936)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2060)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2536)
    at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1564)
    at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1485)
    at login.loginDaos.create(loginDaos.java:33)
    at login.loginDaos.main(loginDaos.java:42)

BUILD SUCCESSFUL (total time: 0 seconds)

Help!

4

1 回答 1

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当您使用 aPreparedStatement时，您应该使用executeQuery(),executeUpdate()或execute()不带String参数的方法。

因此，要解决问题，请使用：

// ....
pstmt.setString(3, bean.getPassword());
pstmt.setString(4, bean.getPosition());
pstmt.executeUpdate();

MySQL 驱动程序实现有一个错误，因为JDBC 规范声明接受字符串的方法SQLException在调用PreparedStatement或CallableStatement实现时应该抛出一个。在这种情况下，它只会抛出异常，因为它会尝试直接执行参数化查询。

于 2013-04-26T14:51:33.043 回答