jdbc连接 MySQL数据库（入门：jdbc mysql 驱动下载）

代码 

package com.study.everyday.apr.jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class Jdbc {
	public static void main(String[] args) {
		String url = "jdbc:mysql://localhost:3306/bob";
		// jdbc:mysql://[hostname][:port]/dbname
		// jdbc:mysql://localhost/addressbook?user=root&password=jjx
		String user = "root";
		String password = "";   //数据库密码为空
		String sql = "select classId,className from	bob.class limit 0, 50 ";
		try {
			try {
				Class.forName("com.mysql.jdbc.Driver");
			} catch (ClassNotFoundException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			Connection con = DriverManager.getConnection(url, user, password);
			Statement stmt = con.createStatement();
			ResultSet rs = stmt.executeQuery(sql);
			while (rs.next()) {
				System.out.println(rs.getString("classId") + " "
						+ rs.getString("className"));
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

注意：

mysql驱动下载 ：http://dev.mysql.com/downloads/connector/j/

 选择相应运行环境的点击 Download 下载，

将驱动放到 Libraries 中。

用的数据库数据：

/*字段信息 - bob.class*/
----------------------------

Field      Type         Collation       Null    Key     Default  Extra           Privileges                       Comment
---------  -----------  --------------  ------  ------  -------  --------------  -------------------------------  -------
classId    int(11)      (NULL)          NO      PRI     (NULL)   auto_increment  select,insert,update,references         
className  varchar(50)  gbk_chinese_ci  YES             (NULL)                   select,insert,update,references         

/*索引信息 - bob.class*/
----------------------------

Table   Non_unique  Key_name  Seq_in_index  Column_name  Collation  Cardinality  Sub_part  Packed  Null    Index_type  Comment
------  ----------  --------  ------------  -----------  ---------  -----------  --------  ------  ------  ----------  -------
class            0  PRIMARY              1  classId      A                    3    (NULL)  (NULL)          BTREE              

/*DDL 信息 - bob.class*/
--------------------------

Table   Create Table                                                                         
------  -------------------------------------------------------------------------------------
class   CREATE TABLE `class` (                                                               
          `classId` int(11) NOT NULL auto_increment,                                         
          `className` varchar(50) default NULL,                                              
          PRIMARY KEY  (`classId`)                                                           
        ) ENGINE=InnoDB DEFAULT CHARSET=gbk CHECKSUM=1 DELAY_KEY_WRITE=1 ROW_FORMAT=DYNAMIC  

原文来自：http://bobshute.javaeye.com/blog/381671Java