Question

我写了get方法，但是我想编写set方法但是它给了我错误说 - PreparedStatement类型中的方法setString（int，String）不适用于参数（String，String，String），String，String，）我的代码如下包com.glomindz.mercuri.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

 import com.glomindz.mercuri.pojo.User;
 import com.glomindz.mercuri.util.MySingleTon;

 public class UserServicesDAO {

private Connection connection;

public UserServicesDAO() {
    // connection = new MySingleTon().getConnection();
    connection = MySingleTon.getInstance().getConnection();

}

public List<User> get_all_data() {
    List<User> usersList = new ArrayList<User>();
    try {
        PreparedStatement stmt = connection.prepareStatement("INSERT INTO              spl_user_master(name,email,mobile,password,role,status,last_update)VALUES(?,?,?,?,?,?,?)");
         stmt.setString("Charlie Sheen","help@glomindz.com","9654087107","cbf51a71a11d7ec348b0d7e9b2f0055f","admin","3","null");

        boolean execute = stmt.execute();
        System.out.println(execute);
        ResultSet resultSet = stmt.getResultSet();
        System.out.println(resultSet.getMetaData());
        while (resultSet.next()) {
            User user = new User();
            user.setId(resultSet.getInt("id"));
            user.setName(resultSet.getString("name"));
            user.setEmail(resultSet.getString("email"));
            user.setMobile(resultSet.getString("mobile"));
            user.setPassword(resultSet.getString("password"));
            user.setRole(resultSet.getString("role"));
            user.setStatus(resultSet.getString("status"));
            user.setLast_udpate(resultSet.getString("last_update"));
            usersList.add(user);
        }
    } 

    catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return usersList;

}

public static void main(String[] args) {
    UserServicesDAO userdao = new UserServicesDAO();
    List<User> data = userdao.get_all_data();
    System.out.println(data);
    System.exit(0);
}

} 我的用户类是包com.glomindz.mercuri.pojo;

     public class User {

private int  id;

     private String  Name;

private String  email;

private String  mobile;

private String  password;

private String  role;

private String  status;

private String  last_update;

public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

public String getName() {
  return Name;
 }

 public void setName(String name) {
  Name = name;
 }

  public String getEmail() {
  return email;
 }

  public void setEmail(String email) {
  this.email = email;
  }

  public String getMobile() {
  return mobile;
  }

  public void setMobile(String mobile) {
  this.mobile = mobile;
  }

  public String getPassword() {
  return password;
   }

  public void setPassword(String password) {
  this.password = password;
 }

  public String getRole() {
  return role;
  }

   public void setRole(String role) {
  this.role = role;
   }

   public String getStatus() {
  return status;
 }

  public void setStatus(String status) {
      this.status = status;
  }
  public String getLast_update() {
  return last_update;
  }



  public void setLast_udpate(String last_update) {
// TODO Auto-generated method stub

   }




     @Override
   public String toString() {
   return "User [id=" + id + "Name=" + Name + ", email=" + email + ", mobile=" + mobile
          + ", password=" + password + ", role=" + role + ", status="
          + status + ", last_update=" + last_update + "]";
    }



    }

Answer 1

PreparedStatement.setString()不是变量arity方法;它不需要变量号。论点。每个占位符（？）必须使用

单独设置

stmt.setString(1, "Charlie Sheen");
stmt.setString(2, "help@glomindz.com");

等等。

使用Spring的JdbcTemplate

jdbcTemplate.update("INSERT INTO spl_user_master(name,email,mobile,password,role,status,last_update)VALUES(?,?,?,?,?,?,?)", new Object[] {
         "Charlie Sheen","help@glomindz.com","9654087107","cbf51a71a11d7ec348b0d7e9b2f0055f","admin","3","null"});

Answer 2

stmt.setString("Charlie Sheen","help@glomindz.com","9654087107","cbf51a71a11d7ec348b0d7e9b2f0055f","admin","3","null");

这不起作用。您必须单独设置，例如：

stmt.setString(1, "Charlie Sheen);

其中1是变量的位置，“Charlie Sheen”是值。您需要为PreparedStatement中的每个占位符?执行此操作。

Answer 3

问题是，您不能使用setString一次设置所有参数。您需要逐个使用setString设置每个参数。：

stmt.setString("Charlie Sheen","help@glomindz.com","9654087107","cbf51a71a11d7ec348b0d7e9b2f0055f","admin","3","null");

来自javadocs：

setString

void setString（int parameterIndex，                  字符串x）                  抛出SQLException

将指定参数设置为给定的Java String值。该   驱动程序将其转换为SQL VARCHAR或LONGVARCHAR值（取决于   关于参数的大小相对于驱动程序对VARCHAR的限制   当它将数据发送到数据库时。

参数：parameterIndex - 第一个参数是1，第二个参数是   2，... x - 参数值

抛出：SQLException - 如果parameterIndex不对应a   SQL语句中的参数标记;如果数据库访问错误   发生或在关闭的PreparedStatement上调用此方法

Answer 4

如this Oracle教程中所示，setString方法接受一个整数，表示参数的编号和表示值的字符串。所以，在你的情况下，你需要做这样的事情：

PreparedStatement stmt = connection.prepareStatement("INSERT INTO spl_user_master(name,email,mobile,password,role,status,last_update)VALUES(?,?,?,?,?,?,?)");
stmt.setString(1, "Charlie Sheen");
stmt.setString(2, "help@glomindz.com");
...

Answer 5

正如其他人发布的那样，您将错误的参数传递给setString()方法。请记住，您必须为查询中单独定义的每个占位符?设置值。

PreparedStatement stmt = connection.prepareStatement("INSERT INTO
     spl_user_master(name,email,mobile,password,role,status,last_update)
     VALUES(?,?,?,?,?,?,?)");
stmt.setString(1,"Charlie Sheen");
stmt.setString(2,"help@glomindz.com");

     ... so on ...

如果相应的列定义为setString()，请记住SQL VARCHAR or LONGVARCHAR用于设置SQL VARCHAR or LONGVARCHAR值代替占位符。对于其他数据类型，API中有各种setXXX()方法。

- PreparedStatement类型中的方法setString（int，String）不适用于参数（String，String，String，String，String，

5 个答案: