Spring 对JDBC的支持（JdbcTemplate）

Posted 2020-08-22 酒香逢

Spring对数据库的操作，使用JdbcTemplate对象

需要引入相关的jar文件

　　如版本：（Spring核心jar包就不列了）

　　spring-jdbc-3.2.5.RELEASE.jar

　　spring-tx-3.2.5.RELEASE.jar

　　C3P0连接池：c3p0-0.9.1.2.jar

　　数据库驱动包：mysql-connector-java-5.1.22-bin.jar

 

例：（对象的获取及注入通过spring来实现）

核心jdbc操作

 1 package test.jdbc;
 2 
 3 import java.sql.ResultSet;
 4 import java.sql.SQLException;
 5 import java.text.SimpleDateFormat;
 6 import java.util.List;
 7 import java.util.Map;
 8 
 9 import org.springframework.jdbc.core.JdbcTemplate;
10 import org.springframework.jdbc.core.RowMapper;
11 
12 public class StudentDao {
13 
14     private JdbcTemplate jdbcTemplate;
15 
16     public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
17         this.jdbcTemplate = jdbcTemplate;
18     }
19     
20     public Student getOneById(String id){
21         List<Student> list = jdbcTemplate.query(
22                 "select * from student where id = ?"
23                 , new objectRowMapper()
24                 , id);
25         return (list!=null && list.size() > 0) ?list.get(0):null;
26     }
27     public List<Student> getAll(){
28         List<Student> list = jdbcTemplate.query(
29                 "select * from student"
30                 , new objectRowMapper());
31         return list;
32     }
33     
34     class objectRowMapper implements RowMapper<Student>{
35 
36         public Student mapRow(ResultSet rs, int index) throws SQLException {
37             Student std = new Student();
38             std.setId(rs.getInt("id"));
39             std.setSname(rs.getString("sname"));
40             std.setSclass(rs.getInt("sclass"));
41             if(rs.getTimestamp("startdate")!=null){
42                 std.setStartdate(new java.util.Date(rs.getTimestamp("startdate").getTime()) );
43             }
44             if(rs.getDate("stopdate")!=null){
45                 std.setStopdate(rs.getDate("stopdate"));
46             }
47             System.out.println(index);
48             return std;
49         }
50         
51     }
52 }

Student实体类：

 1 package test.jdbc;
 2 
 3 import java.util.Date;
 4 
 5 public class Student {
 6     private int sid;
 7     private String sname;
 8     private int sclass;
 9     private Date startdate;
10     private Date stopdate;
11 
12     public int getId() {
13         return sid;
14     }
15     public void setId(int id) {
16         this.sid = id;
17     }
18     
19     public Date getStartdate() {
20         return startdate;
21     }
22     public void setStartdate(Date startdate) {
23         this.startdate = startdate;
24     }
25     public Date getStopdate() {
26         return stopdate;
27     }
28     public void setStopdate(Date stopdate) {
29         this.stopdate = stopdate;
30     }
31     public String getSname() {
32         return sname;
33     }
34     public void setSname(String sname) {
35         this.sname = sname;
36     }
37     public int getSclass() {
38         return sclass;
39     }
40     public void setSclass(int sclass) {
41         this.sclass = sclass;
42     }
43     @Override
44     public String toString() {
45         return "Student [sid=" + sid + ", sname=" + sname + ", sclass="
46                 + sclass + ", startdate=" + startdate + ", stopdate="
47                 + stopdate + "]";
48     }
49     
50 }

bean.xml（Spring容器对象配置文件）

<?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:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">
    
    <!-- 1. 数据源对象: C3P0连接池 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/test01"></property>
        <property name="user" value="root"></property>
        <property name="password" value="123456"></property>
        <property name="initialPoolSize" value="3"></property>
        <property name="maxPoolSize" value="10"></property>
        <property name="maxStatements" value="100"></property>
        <property name="acquireIncrement" value="2"></property>
    </bean>
    
    <!-- 2. 创建JdbcTemplate对象 -->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    
    <!-- dao 实例 -->
    <bean id="studentDao" class="test.jdbc.StudentDao">
        <property name="jdbcTemplate" ref="jdbcTemplate"></property>
    </bean>
</beans> 

测试类

 1 public class App {
 2         // 容器对象
 3         ApplicationContext ac = new ClassPathXmlApplicationContext("test/jdbc/bean.xml");
 4         
 5         @Test
 6         public void testApp() throws Exception {
 7             StudentDao std = (StudentDao) ac.getBean("studentDao");
 8             std.getOneById("13");
 9             System.out.println(std.getAll()); ;
10         }
11 }