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：
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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：
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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：
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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：
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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：
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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"); } }} |
希望本文所述对大家java程序设计有所帮助。
原文链接：https://blog.csdn.net/u010986080/article/details/51812936
