Java使用JDBC连接MYSQL数据库增删改查示例详解编程语言

JDBC连接MYSQL数据库：

import java.sql.Connection; 
import java.sql.DriverManager; 
 
public class Mysql { 
    public static void main(String arg[]) { 
        try { 
            Connection con = null; //定义一个MYSQL链接对象 
            Class.forName("com.mysql.jdbc.Driver").newInstance(); //MYSQL驱动 
            con = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test", "root", "root"); //链接本地MYSQL 
            System.out.print("yes"); 
        } catch (Exception e) { 
            System.out.print("MYSQL ERROR:" + e.getMessage()); 
        } 
 
    } 
} 

Class.forName(“com.mysql.jdbc.Driver”).newInstance(); 我们链接的是MYSQL数据库，所以需要一个MYSQL的数据库驱动，如果你的环境中没有安装， 可以下载：mysql-connector-java-5.1.17-bin.jar JAR包，然后放进jdk1.6.0_37/jre/lib/ext 重启eclispe 就可以在JRE系统库中看到。

con = DriverManager.getConnection;(“jdbc:mysql://127.0.0.1:3306/test”, “root”, “root”); 是链接数据库的语句， 返回Connection con;对象。参数格式：(“jdbc:mysql://ip:端口/数据库名称”, 用户名,密码)

写入一条数据

import java.sql.Connection; 
import java.sql.DriverManager; 
import java.sql.ResultSet; 
import java.sql.Statement; 
 
public class Mysql { 
 
    /** 
     * 入口函数 
     * @param arg 
     */ 
    public static void main(String arg[]) { 
        try { 
            Connection con = null; //定义一个MYSQL链接对象 
            Class.forName("com.mysql.jdbc.Driver").newInstance(); //MYSQL驱动 
            con = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test", "root", "root"); //链接本地MYSQL 
 
            Statement stmt; //创建声明 
            stmt = con.createStatement(); 
 
            //新增一条数据 
            stmt.executeUpdate("INSERT INTO user (username, password) VALUES ('init', '123456')"); 
            ResultSet res = stmt.executeQuery("select LAST_INSERT_ID()"); 
            int ret_id; 
            if (res.next()) { 
                ret_id = res.getInt(1); 
                System.out.print(ret_id); 
            } 
 
        } catch (Exception e) { 
            System.out.print("MYSQL ERROR:" + e.getMessage()); 
        } 
 
    } 
} 

stmt.executeUpdate INSERT; DELETE; UPDATE;语句都用executeUpdate函数来操作 stmt.executeQuery SELECT;语句都用stmt.executeQuery函数来操作 ResultSet res = stmt.executeQuery;(“select LAST;_INSERT_ID()”); 查询最后插入数据的ID号，返回ResultSet res;对象

删除和更新数据

import java.sql.Connection; 
import java.sql.DriverManager; 
import java.sql.ResultSet; 
import java.sql.Statement; 
 
public class Mysql { 
 
    /** 
     * 入口函数 
     * @param arg 
     */ 
    public static void main(String arg[]) { 
        try { 
            Connection con = null; //定义一个MYSQL链接对象 
            Class.forName("com.mysql.jdbc.Driver").newInstance(); //MYSQL驱动 
            con = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test", "root", "root"); //链接本地MYSQL 
 
            Statement stmt; //创建声明 
            stmt = con.createStatement(); 
 
            //新增一条数据 
            stmt.executeUpdate("INSERT INTO user (username, password) VALUES ('init', '123456')"); 
            ResultSet res = stmt.executeQuery("select LAST_INSERT_ID()"); 
            int ret_id; 
            if (res.next()) { 
                ret_id = res.getInt(1); 
                System.out.print(ret_id); 
            } 
 
            //删除一条数据 
            String sql = "DELETE FROM user WHERE id = 1"; 
            long deleteRes = stmt.executeUpdate(sql); //如果为0则没有进行删除操作，如果大于0，则记录删除的条数 
            System.out.print("DELETE:" + deleteRes); 
 
            //更新一条数据 
            String updateSql = "UPDATE user SET username = 'xxxx' WHERE id = 2"; 
            long updateRes = stmt.executeUpdate(updateSql); 
            System.out.print("UPDATE:" + updateRes); 
 
        } catch (Exception e) { 
            System.out.print("MYSQL ERROR:" + e.getMessage()); 
        } 
 
    } 
}

删除和更新数据都使用stmt.executeUpdate函数。 删除和更新数据都会返回一个Long的结果，如果为0，则删除或者更新失败，如果大于0则是操作删除的记录数

查询语句

import java.sql.Connection; 
import java.sql.DriverManager; 
import java.sql.ResultSet; 
import java.sql.ResultSetMetaData; 
import java.sql.Statement; 
 
public class Mysql { 
 
    /** 
     * 入口函数 
     * @param arg 
     */ 
    public static void main(String arg[]) { 
        try { 
            Connection con = null; //定义一个MYSQL链接对象 
            Class.forName("com.mysql.jdbc.Driver").newInstance(); //MYSQL驱动 
            con = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test", "root", "root"); //链接本地MYSQL 
 
            Statement stmt; //创建声明 
            stmt = con.createStatement(); 
 
            //新增一条数据 
            stmt.executeUpdate("INSERT INTO user (username, password) VALUES ('init', '123456')"); 
            ResultSet res = stmt.executeQuery("select LAST_INSERT_ID()"); 
            int ret_id; 
            if (res.next()) { 
                ret_id = res.getInt(1); 
                System.out.print(ret_id); 
            } 
 
            //删除一条数据 
            String sql = "DELETE FROM user WHERE id = 1"; 
            long deleteRes = stmt.executeUpdate(sql); //如果为0则没有进行删除操作，如果大于0，则记录删除的条数 
            System.out.print("DELETE:" + deleteRes); 
 
            //更新一条数据 
            String updateSql = "UPDATE user SET username = 'xxxx' WHERE id = 2"; 
            long updateRes = stmt.executeUpdate(updateSql); 
            System.out.print("UPDATE:" + updateRes); 
 
            //查询数据并输出 
            String selectSql = "SELECT * FROM user"; 
            ResultSet selectRes = stmt.executeQuery(selectSql); 
            while (selectRes.next()) { //循环输出结果集 
                String username = selectRes.getString("username"); 
                String password = selectRes.getString("password"); 
                System.out.print("/r/n/r/n"); 
                System.out.print("username:" + username + "password:" + password); 
            } 
 
        } catch (Exception e) { 
            System.out.print("MYSQL ERROR:" + e.getMessage()); 
        } 
 
    } 
} 

查询语句使用stmt.executeQuery函数

• rs.absolute() //绝对位置，负数表示从后面数
• rs.first()第一条
• rs.last()最后一条
• rs.previoust()前一条
• rs.next()后一条
• rs.beforeFirst()第一条之前
• rs.afterLast()最后之后
• rs.isFirst(),rs.isLast(),rs.isBeforeFirst(),rs.isAfterLast