Java使用Statement接口执行SQL语句操作实例分析

发布时间：2020-09-11 23:02:27 作者：Young-xy
来源：脚本之家阅读：234

本文实例讲述了Java使用Statement接口执行SQL语句操作的方法。分享给大家供大家参考，具体如下：

Statement执行SQL语句：

1. 对数据库的曾删改操作时，使用stmt.executeUpdate(sql) 执行给定 SQL 语句，分别为 insert 、update、delete.

2. 对数据库做查询时，直接使用 stmt.executeQuery(sql)，返回结果可以为一个resultSet结果集。

首先做一些准备工作：

①对要进行操作的数据库表进行封装，比如说我的数据mydata中的aistu表，用AiMember.java进行封装，以便后面操作。具体如下：

package com.mysqltest.jdbc.model;
/**
 * 定义一个model
 * 成员模型
 * @author AI_STU
 *
 */
public class AiMember {
  private String name;
  private int id;
  private int age;
  private String email;
  private String tel;
  private double salary;
  private String riqi;
  /**
   * alt+shift+s 添加构造函数generating constructor using fields.
   * @param name
   * @param id
   * @param age
   * @param email
   * @param tel
   * @param salary
   * @param riqi
   */
  public AiMember(String name, int id, int age, String email, String tel, double salary, String riqi) {
    super();
    this.name = name;
    this.id = id;
    this.age = age;
    this.email = email;
    this.tel = tel;
    this.salary = salary;
    this.riqi = riqi;
  }
  //重构
  public AiMember(int id) {
    super();
    this.id = id;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public int getId() {
    return id;
  }
  public void setId(int id) {
    this.id = id;
  }
  public int getAge() {
    return age;
  }
  public void setAge(int age) {
    this.age = age;
  }
  public String getEmail() {
    return email;
  }
  public void setEmail(String email) {
    this.email = email;
  }
  public String getTel() {
    return tel;
  }
  public void setTel(String tel) {
    this.tel = tel;
  }
  public double getSalary() {
    return salary;
  }
  public void setSalary(double salary) {
    this.salary = salary;
  }
  public String getRiqi() {
    return riqi;
  }
  public void setRiqi(String riqi) {
    this.riqi = riqi;
  }
}

②对连接MySQL数据库，和关闭连接方法进行封装，这里用DbUtil.java进行封装，具体如下：

package com.mysqltest.jdbc.modelComp;
public class CompMember {
  private int id;
  private String name;
  private int age;
  private double salary;
  /**
   * 构造函数1
   * @param name
   * @param age
   * @param salary
   */
  public CompMember(String name, int age, double salary) {
    super();
    this.name = name;
    this.age = age;
    this.salary = salary;
  }
  /**
   * 重载构造函数
   * @param id
   * @param name
   * @param age
   * @param salary
   */
  public CompMember(int id, String name, int age, double salary) {
    super();
    this.id = id;
    this.name = name;
    this.age = age;
    this.salary = salary;
  }
  /**
   * get,set方法
   */
  public int getId() {
    return id;
  }
  public void setId(int id) {
    this.id = id;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public int getAge() {
    return age;
  }
  public void setAge(int age) {
    this.age = age;
  }
  public double getSalary() {
    return salary;
  }
  public void setSalary(double salary) {
    this.salary = salary;
  }
  @Override
  /**
   * 改写toString,使得显示更好
   */
  public String toString() {
    return "["+this.id+"]"+this.name+","+this.age+","+this.salary;
  }
}

准备工作做好了，下面开始使用Statement接口执行sql语句来实现增删改：

①增：

package com.mysqltest.jdbc.two2;
import java.sql.Connection;
import java.sql.Statement;
import com.mysqltest.jdbc.model.AiMember;
import com.mysqltest.jdbc.util.DbUtil;
public class Demo3 {
  /**
   * 添加成员到表中1
   * @param name
   * @param id
   * @param age
   * @param email
   * @param tel
   * @param salary
   * @param riqi
   * @return
   * @throws Exception
   */
  @SuppressWarnings("unused")
  private static int addMember(String name,int id,int age,String email,String tel,double salary,String riqi) throws Exception{
    DbUtil dbUtil = new DbUtil();//之前封装好的
    Connection con = dbUtil.getCon(); //获取数据库连接
    String sql = "insert into aistu values('"+name+"',"+id+",'"+age+"','"+email+"','"+tel+"','"+salary+"','"+riqi+"')";
    Statement stmt = con.createStatement();//获取statement
    int result = stmt.executeUpdate(sql);
    dbUtil.close(stmt, con);
    return result;
  }
  /**
   * 添加成员到表中2方法
   * @param mem
   * @return
   * @throws Exception
   */
  private static int addMember2(AiMember mem) throws Exception{ //AiMember也是之前封装好的
//    mem.getName();
    DbUtil dbUtil = new DbUtil();//之前封装好的
    Connection con = dbUtil.getCon(); //获取数据库连接
    String sql = "insert into aistu values('"+mem.getName()+"',"+mem.getId()+",'"+mem.getAge()+"','"+mem.getEmail()+"','"+mem.getTel()+"','"+mem.getSalary()+"','"+mem.getRiqi()+"')";
    Statement stmt = con.createStatement();//获取statement
    int result = stmt.executeUpdate(sql);
    dbUtil.close(stmt, con);
    return result;
  }
//  private static int addMenber2()
  public static void main(String[] args) throws Exception {
    /*int result = addMember("刘翔", 4, 28, "15xliu@stu.edu.cn", "13411957776", 8000.00, "2015-09-10");
    if(result==1){
      System.out.println("添加成功");
    }else{
      System.out.println("添加失败");
    }*/ //多行注释，ctrl+shift+/
    AiMember mem = new AiMember("李娜", 6, 25, "15nli@stu.edu.cn", "13411957775", 8000.00, "2015-09-03");
    int result = addMember2(mem);
    if(result==1){
      System.out.println("添加成功");
    }else{
      System.out.println("添加失败");
    }
  }
}

②改：

package com.mysqltest.jdbc.two3;
import java.sql.Connection;
import java.sql.Statement;
import com.mysqltest.jdbc.model.AiMember;
import com.mysqltest.jdbc.util.DbUtil;
public class Demo4 {
  private static DbUtil dbUtil = new DbUtil();
//  @SuppressWarnings("unused")
  /**
   * 修改成员
   * @param mem
   * @return
   * @throws Exception
   */
  private static int updateMember(AiMember mem) throws Exception {
    Connection con = dbUtil.getCon(); // 获取数据库连接
    String sql = "update aistu set name='" + mem.getName() + "',id=" + mem.getId() + ",age='" + mem.getAge()
        + "',email='" + mem.getEmail() + "',tel='" + mem.getTel() + "',salary='" + mem.getSalary() + "',riqi='"
        + mem.getRiqi() + "' where id=" + mem.getId();
    //格式化，ctrl+a全选，然后ctrl+shift+f格式化
    Statement stmt = con.createStatement();// 获取statement
    int result = stmt.executeUpdate(sql);
    dbUtil.close(stmt, con);
    return result;
//    return 0;
  }
  public static void main(String[] args) throws Exception {
    AiMember mem = new AiMember("劳尔", 6, 24, "14elao@stu.edu.cn", "13411957770", 18000.00, "2014-09-03");
    int result = updateMember(mem);
    if (result==1) {
      System.out.println("更新成功");
    } else {
      System.out.println("更新失败");
    }
  }
}

③删：

package com.mysqltest.jdbc.two4;
import java.sql.Connection;
import java.sql.Statement;
import com.mysqltest.jdbc.model.AiMember;
import com.mysqltest.jdbc.util.DbUtil;
public class Demo5 {
  private static DbUtil dbUtil = new DbUtil();
  public static int deletMember(AiMember mem) throws Exception{
    Connection con = dbUtil.getCon(); // 获取数据库连接
    String sql = "delete from aistu where id="+mem.getId();
    Statement stmt = con.createStatement();// 获取statement
    int result = stmt.executeUpdate(sql);
    dbUtil.close(stmt, con);
    return result;
  }
  public static void main(String[] args) throws Exception {
    AiMember mem = new AiMember(5);
    int result = deletMember(mem);
    if (result==1) {
      System.out.println("成功删除成员");
    } else {
      System.out.println("删除成员失败");
    }
  }
}

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Java使用Statement接口执行SQL语句操作实例分析

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