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- spring 提供用于操作JDBC工具类，类似：DBUtils。
- 依赖 连接池DataSource （数据源）
-
环境搭建
-
创建表
create database spring_day;
use spring_day;
create table t_user(
id int primary key auto_increment,
username varchar(50),
password varchar(32)
);
insert into t_user(username,password) values('jack','1234');
insert into t_user(username,password) values('rose','5678');
或者用下面代码创建表
ApplicationContext applicationContext = new ClassPathXmlApplicationContext(xmlPath);
JdbcTemplate jdbcTemplate = (JdbcTemplate) applicationContext.getBean("jdbcTemplate");
jdbcTemplate.execute("create table t_user(+ "+
" id int primary key auto_increment," +
" username varchar(50)," +
"password varchar(32)");
System.out.println("账户表 t_user 创建成功");-
导入jar包
-
javabean
public class User {
private Integer id;
private String username;
private String password;
-
使用api（了解）
public static void main(String[] args) {
// 1 创建数据源 (连接池) dbcp
BasicDataSource dataSource = new BasicDataSource();
// * 基本 4 项
dataSource.setDriverClassName("com.mysql.jdbc.Driver");
dataSource.setUrl("jdbc:mysql://localhost:3306/spring_day");
dataSource.setUsername("root");
dataSource.setPassword("123456");
// 2 创建模板
JdbcTemplate jdbcTemplate = new JdbcTemplate();
jdbcTemplate.setDataSource(dataSource);
// 3 通过 api 操作
jdbcTemplate.update("insert into t_user(username,password) values(?,?);", "tom" , "998");
}-
配置DBCP
UserDao
private JdbcTemplate jdbcTemplate;
public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
this.jdbcTemplate = jdbcTemplate;
}
public void updata(User user) {
String sql = "updata t_user set username=?, password=? where id =?";
Object[] args = {user.getUsername(),user.getPassword(),user.getId()};
jdbcTemplate.update(sql,args);
}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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.3.xsd">
<!-- 创建数据源 -->
<bean id="dataSourceId" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
<property name="url" value="jdbc:mysql://localhost:3306/spring_day"></property>
<property name="username" value="root"></property>
<property name="password" value="123456"></property>
</bean>
<!-- 创建模板 ,需要注入数据源-->
<bean id="jdbcTemplateId" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSourceId"></property>
</bean>
<!-- 配置dao -->
<bean id="UserDaoId" class="com.c_dbcp.UserDao">
<property name="jdbcTemplate" ref="jdbcTemplateId"></property>
</bean>
</beans>TestDBCP
@Test
public void demo02 () {
User user = new User();
user.setId(1);
user.setUsername("接客");
user.setPassword("998");
String xmlPath = "com/c_dbcp/beans.xml";
ApplicationContext applicationContext = new ClassPathXmlApplicationContext(xmlPath);
UserDao userDao = (UserDao) applicationContext.getBean("UserDaoId");
userDao.updata(user);
}-
配置C3P0
UserDao
public class UserDao {
private JdbcTemplate jdbcTemplate;
public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
this.jdbcTemplate = jdbcTemplate;
}
public void updata(User user) {
String sql = "update t_user set username=?, password=? where id =?";
Object[] args = {user.getUsername(),user.getPassword(),user.getId()};
jdbcTemplate.update(sql,args);
}
// 查询所有
public List<User> findAll() {
return jdbcTemplate.query("select * from t_user",new Object[]{}, new BeanPropertyRowMapper<User>(User.class));
}
}
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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.3.xsd">
<!-- 创建数据源 c3p0 -->
<bean id="dataSourceId" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="com.mysql.jdbc.Driver"></property>
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/spring_day"></property>
<property name="user" value="root"></property>
<property name="password" value="123456"></property>
</bean>
<!-- 创建模板 ,需要注入数据源-->
<bean id="jdbcTemplateId" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSourceId"></property>
</bean>
<!-- 配置dao -->
<bean id="UserDaoId" class="com.d_c3p0.UserDao">
<property name="jdbcTemplate" ref="jdbcTemplateId"></property>
</bean>
</beans>TestC3P0
public class TestC3P0 {
@Test
public void demo02 () {
User user = new User();
user.setId(1);
user.setUsername("接客");
user.setPassword("999");
String xmlPath = "com/d_c3p0/beans.xml";
ApplicationContext applicationContext = new ClassPathXmlApplicationContext(xmlPath);
UserDao userDao = (UserDao) applicationContext.getBean("UserDaoId");
userDao.updata(user);
List<User> allUser = userDao.findAll();
for (User user : allUser) {
System.out.println(user);
}
}
}
-
使用JdbcDaoSupport
-
dao层
-
spring配置文件
<!-- 创建数据源 c3p0 -->
<bean id="dataSourceId" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="com.mysql.jdbc.Driver"></property>
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/spring_day"></property>
<property name="user" value="root"></property>
<property name="password" value="123456"></property>
</bean>
<!-- 配置dao -->
<bean id="UserDaoId" class="com.e_jdbcdaosupport.UserDao">
<property name="dataSource" ref="dataSourceId"></property>
</bean>-
源码分析
-
配置properties（先创建properties文件）
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.jdbcUrl=jdbc:mysql://localhost:3306/spring_day
jdbc.user=root
jdbc.password=123456-
Spring配置
<!-- 加载配置文件
"classpath:"前缀表示 src下
在配置文件之后通过 ${key} 获得内容
-->
<context:property-placeholder location="classpath:com/itheima/f_properties/jdbcInfo.properties"/>
<!-- 创建数据源 c3p0-->
<bean id="dataSourceId" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${jdbc.driverClass}"></property>
<property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
<property name="user" value="${jdbc.user}"></property>
<property name="password" value="${jdbc.password}"></property>
</bean>