spring再学习之整合JDBC

一、JDBCTemplate JDBC模板

user类

package cn.itcast.bean;

import java.util.Date;

public class User {
    private Integer id;

    private String username;

    private Date birthday;

    private String sex;

    private String address;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username == null ? null : username.trim();
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex == null ? null : sex.trim();
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address == null ? null : address.trim();
    }
}

准备数据库：

package cn.itcast.a_jdbctemplate;

import java.beans.PropertyVetoException;

import org.junit.Test;
import org.springframework.jdbc.core.JdbcTemplate;

import com.mchange.v2.c3p0.ComboPooledDataSource;

//演示JDBC模板
public class Demo {
    
    @Test
    public void fun1() throws Exception {
        //0准备连接池C3p0
        ComboPooledDataSource dataSource = new ComboPooledDataSource();
        dataSource.setDriverClass("com.mysql.jdbc.Driver");
        dataSource.setJdbcUrl("jdbc:mysql:///mybatis");
        dataSource.setUser("root");
        dataSource.setPassword("mysqladmin");

        //1创建JDBC模板对象
        JdbcTemplate it = new JdbcTemplate();
        
        it.setDataSource(dataSource);
            
        //2、书写sql语句，并执行
        String sql="insert into user(username) value('rose')";
        it.update(sql);
        
    }

}

结果：

二、UserDao用JDBCJDBCTemplate实现

public interface UserDao {
    
    //增
    void save (User u);
    //删
    void delete(Integer id);
    //改
    void update(User u);
    //查
    User getById(Integer id);
    //查
    int getTotalCount();
    //查 

}

实现类：

手动注入JDBC模板

private JdbcTemplate it;

package cn.itcast.a_jdbctemplate;

import java.sql.ResultSet;
import java.sql.SQLException;

import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;

import cn.itcast.bean.User;

public class UserDaoImpl implements UserDao{
    private JdbcTemplate it;
    @Override
    public void save(User u) {
        String sql="insert into user value(null,?)";
        // TODO Auto-generated method stub
        it.update(sql, u.getUsername());
    }

    public JdbcTemplate getIt() {
        return it;
    }

    public void setIt(JdbcTemplate it) {
        this.it = it;
    }

    @Override
    public void delete(Integer id) {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void update(User u) {
        // TODO Auto-generated method stub
        
    }

    @Override
    public User getById(Integer id) {
        
        String sql = "select * from user where id=?";
        
       return it.queryForObject(sql, new RowMapper<User>() {
            
            @Override
            public User mapRow(ResultSet rs, int arg1) throws SQLException {
                
                User u = new User();
                u.setId(rs.getInt("id"));
                u.setUsername(rs.getString("name")); 
                // TODO Auto-generated method stub
                return u;
            }
            
        }, id);
        
        // TODO Auto-generated method stub
    }

    @Override
    public int getTotalCount() {
        
        String sql = "select count(*) from user";
        // TODO Auto-generated method stub
        return it.queryForObject(sql,Integer.class);
    }

}

配置文件：

顺序：

 

db.properties配置文件

jdbc.jdbcUrl=jdbc:mysql:///mybatis
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.user=root
jdbc.password=*****

spring配置文件：

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

<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
       xmlns="http://www.springframework.org/schema/beans" 
       xmlns:p="http://www.springframework.org/schema/p" 
       xmlns:context="http://www.springframework.org/schema/context" 
       xsi:schemaLocation="http://www.springframework.org/schema/beans 
       http://www.springframework.org/schema/beans/spring-beans-4.2.xsd 
       http://www.springframework.org/schema/context 
       http://www.springframework.org/schema/context/spring-context-4.2.xsd ">      
   
   <!--指定Spring读取db.properties  -->
   <context:property-placeholder location="classpath:db.properties"  />
   
      
   <!-- 1.将连接池交给Spring管理 -->   
      <bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
          <property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
          <property name="driverClass" value="${jdbc.driverClass}"></property>
          <property name="user" value="${jdbc.user}"></property>
          <property name="password" value="${jdbc.password}"></property>
      </bean>
   <!-- 2.将JDBCTemplate放入Spring容器 -->
      <bean name="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
           <property name="dataSource" ref="dataSource"></property>
      </bean>
   <!-- 3.将UserDao放入spring容器 -->
   <bean name="userDao" class="cn.itcast.a_jdbctemplate.UserDaoImpl">
        <property name="it" ref="jdbcTemplate"></property>
   
   </bean>

</beans>

测试：

package cn.itcast.a_jdbctemplate;

import javax.annotation.Resource;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import cn.itcast.bean.User;

//演示JDBC模板
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class Demo02 {
    @Resource(name="userDao")
    private UserDao ud;
    @Test
    public void fun() throws Exception{
        int totalCount = ud.getTotalCount();
        System.out.println(totalCount);
        } 
}

 结果：

数据库资料：

控制台输出结果：

14

三、通过继承来准备JDBC模板

配置文件修改：

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

<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
       xmlns="http://www.springframework.org/schema/beans" 
       xmlns:p="http://www.springframework.org/schema/p" 
       xmlns:context="http://www.springframework.org/schema/context" 
       xsi:schemaLocation="http://www.springframework.org/schema/beans 
       http://www.springframework.org/schema/beans/spring-beans-4.2.xsd 
       http://www.springframework.org/schema/context 
       http://www.springframework.org/schema/context/spring-context-4.2.xsd ">      
   
   <!--指定Spring读取db.properties  -->
   <context:property-placeholder location="classpath:db.properties"  />
   
      
   <!-- 1.将连接池交给Spring管理 -->   
      <bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
          <property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
          <property name="driverClass" value="${jdbc.driverClass}"></property>
          <property name="user" value="${jdbc.user}"></property>
          <property name="password" value="${jdbc.password}"></property>
      </bean>
   <!-- 2.将UserDao放入spring容器 -->
   <bean name="userDao" class="cn.itcast.a_jdbctemplate.UserDaoImpl">
     <!--   <property name="it" ref="jdbcTemplate"></property>-->
        <property name="dataSource" ref="dataSource"></property>
   </bean>


</beans>