SpringJdbc 【springjdbc的使用方法】

1 什么是springjdbc

　　spring对jdbc的封装

2 使用SpringJdbc的编程步骤

　　2.1 导包

　　　　spring-jdbc : springjdbc的包
　　　　mysql ： MySQL的驱动包
　　　　dbcp ：数据库连接池
　　　　spring-webmvc : springmvc框架包
　　　　annotation ：@resource需要用到的包，该包在Tomcat中有，如果是web项目而且运行环境是Tomcat的话就不需要导入这个包了
　　　　junit ： 单元测试包

　　2.2 添加spring配置文件

 <?xml version="1.0" encoding="UTF-8"?>

 <beans xmlns="http://www.springframework.org/schema/beans"

     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"

     xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:jee="http://www.springframework.org/schema/jee"

     xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop"

     xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:util="http://www.springframework.org/schema/util"

     xmlns:jpa="http://www.springframework.org/schema/data/jpa"

     xsi:schemaLocation="

         http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd

         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd

         http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd

         http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd

         http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd

         http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd

         http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd

         http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd

         http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd">

 </beans>

spring配置文件

　　2.3 添加含有数据库信息的的properties文件

driverClassName=oracle.jdbc.driver.OracleDriver

url=jdbc:oracle:thin:@176.114.0.23:1521:orcl

username=jsd1608

password=jsd1608

maxactive=1

maxwait=3000

properties文件【oracle】

 driverClassName=com.mysql.jdbc.Driver

 url=jdbc:mysql://127.0.0.1:3306/xiangxu

 username=root

 password=182838

 maxActive=1

 maxWait=3000

properties文件【MySQL】

　　2.4 在spring配置文件中配置 Jdbc Temple

　　　　2.4.1 配置properties的bean

　　　　2.4.2 配置数据库链接池

　　　　2.4.3 配置jdbcTemplate

　　2.5 在spring配置文件中配置注解扫描

 <?xml version="1.0" encoding="UTF-8"?>

 <beans xmlns="http://www.springframework.org/schema/beans"

     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"

     xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:jee="http://www.springframework.org/schema/jee"

     xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop"

     xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:util="http://www.springframework.org/schema/util"

     xmlns:jpa="http://www.springframework.org/schema/data/jpa"

     xsi:schemaLocation="

         http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd

         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd

         http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd

         http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd

         http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd

         http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd

         http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd

         http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd

         http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd">

     <!-- 读取config.properties文件 -->

     <util:properties id="config"

     location="classpath:config.properties"/>

     <!-- 配置连接池 -->

     <bean id="ds"

     class="org.apache.commons.dbcp.BasicDataSource"

        destroy-method="close">

       <property name="driverClassName"

       value="#{config.driverClassName}" />

       <property name="url"

       value="#{config.url}" />

       <property name="username"

       value="#{config.username}" />

       <property name="password"

       value="#{config.password}" />

     </bean>

     <!-- 配置jdbcTemplate -->

     <bean id="jt" class="org.springframework.jdbc.core.JdbcTemplate">

         <property name="dataSource" ref="ds"></property>

     </bean>

     <!-- 组件扫描 -->

     <context:component-scan base-package="dao"></context:component-scan>

 </beans>

配置好的spring配置文件

3 利用springjdbc中JdbcTemplate类中的方法去实现数据库操作

 package dao;

 import java.io.Serializable;

 import java.sql.ResultSet;

 import java.sql.SQLException;

 import java.util.ArrayList;

 import java.util.List;

 import javax.annotation.Resource;

 import org.springframework.jdbc.core.JdbcTemplate;

 import org.springframework.jdbc.core.RowMapper;

 import org.springframework.stereotype.Repository;

 import entity.Admin;

 @Repository("adminDao")

 public class AdminDao implements Serializable {

     /**

      * JdbcTemplate提供了很多方法

      *         这些方法对jdbc api做了封装，从而简化了代码；不再需要考虑获取连接，关闭连接。

      * 另外，如果发生了异常，会自动封装成RuntimeException然后抛出

      * @param emp

      */

     @Resource(name="jt")

     private JdbcTemplate jt;

     /**

      * 向数据库插入数据

      * @param

      */

     public void insert(Admin admin) {

         String sql = "INSERT INTO admin "

                 + "(name, password, gender) "

                 + "VALUES "

                 + "(?,?,?) ";

         Object [] args = {admin.getName(), admin.getPassword(), admin.getGender()};

         jt.update(sql, args); // update() 这个方法可以完成：插入 删除 修改 都能完成

     }

     /**

      * 查询数据库中的所有数据

      * @return

      */

     public List<Admin> findAll() {

         List<Admin> admins = new ArrayList<Admin>();

         String sql = "SELECT * "

                 + "FROM admin ";

         admins = jt.query(sql, new AdminRowMapper());  // query() 方法可以实现 查询 功能

         return admins;

     }

     /**

      * 查询满足条件的员工信息（bug版）

      * @param id

      * @return

      */

     public Admin findById(Integer id) {

         Admin admin = null;

         String sql = "SELECT * "

                 + "FROM admin "

                 + "WHERE id = ? ";

         Object [] args = {id};

         admin = jt.queryForObject(sql, args, new AdminRowMapper());

         return admin;

     }

 //    查询满足条件的用户所有信息（加强版）

     public Admin findById2(Integer id) {

         Admin admin = null;

         String sql = "SELECT * "

                 + "FROM admin "

                 + "WHERE id = ? ";

         Object [] args = {id};

         List<Admin> admins = jt.query(sql, args, new AdminRowMapper());

         if(admins != null && admins.size() > 0) {

             admin = admins.get(0);

         }

         return admin;

     }

 //    修改满足指定条件的员工信息

     public void modify(Admin admin){

         String sql = "UPDATE admin "

                 + "SET name = ?, gender = ? "

                 + "WHERE id = ? ";

         Object[] args = {admin.getName(), admin.getGender(), admin.getId()};

         jt.update(sql, args);

     }

 //    删除满足指定条件的员工信息

     public void delete(Integer id) {

         String sql = "DELETE FROM "

                 + "admin "

                 + "WHERE id = ? ";

         Object [] args = {id};

         jt.update(sql, args);

     }

 //    编写一个内部类：需要实现RowMapper接口

 //    该类的作用：告诉spring怎么将数据库中的记录变成对象

     class AdminRowMapper implements RowMapper<Admin> {

 //        rs:查询到的结果集

 //        rowNum:记录的下标（从0开始）

         public Admin mapRow(ResultSet rs, int rowNum) throws SQLException {

             Admin admin = new Admin();

             admin.setId(rs.getInt("id"));

             admin.setName(rs.getString("name"));

             admin.setPassword(rs.getString("password"));

             admin.setGender(rs.getString("gender"));

             return admin;

         }

     }

 }

springjdbc中JdbcTemplate类中的方法使用案例

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