Java 连接 MySQL 数据库

下载 MySQL 数据库：http://dev.mysql.com/downloads/mysql/ ，解压到本地即可

下载 jar 包：http://dev.mysql.com/downloads/connector/j/ ，下载 zip 压缩包

创建数据库并插入若干数据：

create table mydb;

use mydb;
create table student(name varchar(8), no char(7));
insert into student values(‘zhang‘, ‘011‘);

insert into student values(‘li‘, ‘021‘);
select * from student;

数据库连接类：

package g.dao;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;
public class DbConnection {
public static Connection getConnection() throws ClassNotFoundException, SQLException {
Class.forName("com.mysql.jdbc.Driver");

        String url = "jdbc:mysql://127.0.0.1:3306/mydb";
Connection connection = DriverManager.getConnection(url, "root", "root");
return connection;

    }
public static void free(Connection connection, Statement statement, ResultSet resultSet) {

        try {

            if (resultSet != null) {

                resultSet.close();

            }

            if (statement != null) {

                statement.close();

            }

            if (connection != null) {

                connection.close();

            }

        } catch (SQLException e) {

            e.printStackTrace();

        }

    }

}

测试JDBC连接：

package g.dao;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;
public class TestJDBC {
public static void main(String[] args) {
Connection connection = null;

        PreparedStatement statement = null;

        ResultSet resultSet = null;
try {

            connection = DbConnection.getConnection();

            String sql = "select * from student";

            statement = connection.prepareStatement(sql);

            resultSet = statement.executeQuery();
while (resultSet.next()) {

                System.out.println(resultSet.getString("name") + " : "

                        + resultSet.getString("no"));

            }
} catch (ClassNotFoundException e) {

            e.printStackTrace();

        } catch (SQLException e) {

            e.printStackTrace();

        }

    }

}

Java 连接 MySQL 数据库