Java 和 MySQL，SELECT 有效；插入不

Question

我正在做一个 Java WebService，它执行一些 SQL 查询。

SELECT FROM a table 方法工作正常。 但 INSERT INTO 语句不会；它实际上并不更新数据库的表。我猜为什么。

SELECT FROM 方法:

@WebMethod(operationName = "retrievePlayer")
public String retrievePlayer(@WebParam(name = "user") String user, @WebParam(name = "password") String password)
    {

    String customerInfo = "";

    try
      {
      Class.forName("com.mysql.jdbc.Driver").newInstance();
      Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", "root", "root");

      PreparedStatement statement
        =  con.prepareStatement("select user, password, level from mytable where user=\"" + user + "\";");
       ResultSet result = statement.executeQuery();

       while(result.next())
          {
          customerInfo = customerInfo
                     + result.getString("user")
                     + "&" + result.getString("password")
                     + "&"+result.getString("level");
          }
       }
       catch(Exception exc){ System.out.println(exc.getMessage()); }        

       return customerInfo;
       }

INSERT方法，不起作用:

@WebMethod(operationName = "createPlayer")
public void createPlayer(@WebParam(name = "user") String user, @WebParam(name = "password") String password)
    {
    try
      {
      Class.forName("com.mysql.jdbc.Driver").newInstance();
      Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", "root", "root");

      PreparedStatement statement
            =  con.prepareStatement("insert into mytable ('user', 'password', 'level') values ('" + user + "','" + password + "','0,1');");
      statement.executeQuery();*/

      }
    catch(Exception exc){ System.out.println(exc.getMessage()); }
    }

提前致谢。

Answer 1

插入时，交换

statement.executeQuery

与

statement.executeUpdate