Java连接MySQL数据库

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1.安装MySQL数据库，建立自己的测试用例

2.下载Connector/J，加压将.jar文件复制到Jre\lib\ext目录下。网址：http://www.mysql.com/downloads/connector/j/

3.创建连接和关闭数据库的类DBHelper.java

import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.SQLException;public class DBHelper{private static final String url = "jdbc:mysql://127.0.0.1/test";private static final String driverName = "com.mysql.jdbc.Driver";private static final String user = "root";private static final String password = "111111";public Connection conn = null;public PreparedStatement pst = null;public DBHelper(String sql){try{Class.forName(driverName);//驱动器载入conn = DriverManager.getConnection(url, user, password);//获取连接pst = conn.prepareStatement(sql);//与准备之行语句}catch(Exception e){e.printStackTrace();}}public void close(){try{this.conn.close();this.pst.close();}catch(SQLException e){e.printStackTrace();}}}

4.创建Demo.java类进行测试

import java.sql.ResultSet;import java.sql.SQLException;public class Demo{static String sql = null;static DBHelper db1 = null;static ResultSet ret = null;public static void main(String[] args){sql = "select * from Employees";db1 = new DBHelper(sql);try{ret = db1.pst.executeQuery();while(ret.next()){String id = ret.getString(1);String age = ret.getString(2);String first = ret.getString(3);String last = ret.getString(4);System.out.println(id + "\t" + age + "\t" + first + "\t" + last);}ret.close();db1.close();}catch(SQLException e){e.printStackTrace();}}}

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