JDBC

Java DataBase Connectivity,Java数据库连接

import java.sql.DriverManager;import java.sql.Connection;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;public class Test {    public static void main(String[] args) throws ClassNotFoundException,            SQLException {        Connection conn = null;        Statement stmt = null;        ResultSet rs = null;        try {            Class.forName("com.mysql.jdbc.Driver");// 加载MySQL驱动            // 获取数据库连接对象            conn = DriverManager.getConnection(                    "jdbc:mysql://localhost:3306/school", "root", "123456");            //查            stmt = conn.createStatement();            rs = stmt.executeQuery("select * from student");            while (rs.next()) {                // System.out.println(String.format("编号%d,姓名:%s",rs.getInt("id"),rs.getString("name")));                System.out.println(String.format("编号%d,姓名:%s", rs.getInt(1),                        rs.getString(2)));// 索引从1开始            }            //增            stmt.executeUpdate("insert into student(name) values('雷科巴'),('巴乔'),('梅西')");//返回3            //删            stmt.executeUpdate("delete from student");            //改            stmt.executeUpdate("update student set name='席尔瓦' where id=3");        } finally {            if (rs != null) {                rs.close();            }            if (stmt != null) {                stmt.close();            }            if (conn != null) {                conn.close();            }        }    }}

使用预编译语句PrepareStatement

import java.sql.DriverManager;import java.sql.Connection;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.PreparedStatement;public class Test {    public static void main(String[] args) throws ClassNotFoundException,            SQLException {        Connection conn = null;        PreparedStatement  stmt = null;        ResultSet rs = null;        try {            Class.forName("com.mysql.jdbc.Driver");// 加载MySQL驱动            // 获取数据库连接对象            conn = DriverManager.getConnection(                    "jdbc:mysql://localhost:3306/school", "root", "123456");            stmt=conn.prepareStatement("select name from student where id=?");            stmt.setInt(1, 14);//索引从1开始            rs=stmt.executeQuery();            if(rs.next()){                System.out.println(rs.getString("name"));            }        } finally {            if (rs != null) {                rs.close();            }            if (stmt != null) {                stmt.close();            }            if (conn != null) {                conn.close();            }        }    }}