JdbcTemplate

环境搭建

spring 提供用于操作JDBC工具类，类似：DBUtils。
依赖 连接池DataSource （数据源）

导入jar包

javabean

public class User {
	private Integer id;
	private String username;
	private String password;
}

dao层

public class UserDao {
    JdbcTemplate jdbcTemplate;

    public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
        this.jdbcTemplate = jdbcTemplate;
    }

    public List<Map<String, Object>> SelectAll(){
        List<Map<String, Object>> maps = jdbcTemplate.queryForList("select * from user ");
        return maps;
    }
}

两种连接池 spring配置

BDCP

	<!--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/nais"></property>
		<property name="username" value="root"></property>
		<property name="password" value="passw0rd"></property>
	</bean>
	<!--创建模板，注入数据源-->
	<bean id="jdbcTemplateId" class="org.springframework.jdbc.core.JdbcTemplate">
		<property name="dataSource" ref="dataSourceId"></property>
	</bean>
	<!--配置dao层-->
	<bean id="UserDaoId" class="jdbc.a_domain.c_dbcp.UserDao">
		<property name="jdbcTemplate" ref="jdbcTemplateId"></property>
	</bean>

C3P0

<!-- 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/nais"></property>
		<property name="user" value="root"></property>
		<property name="password" value="1234"></property>
	</bean>

Test

  public void demo01(){
        //创建dao
        String xmlPath="jdbc/a_domain/c_dbcp/beans.xml";
        ApplicationContext applicationContext=new ClassPathXmlApplicationContext(xmlPath);
        UserDao userDao = (UserDao) applicationContext.getBean("UserDaoId");
        List<Map<String, Object>> maps = userDao.SelectAll();
        for (Map<String, Object> map : maps) {
            System.out.println(map);
        }
    }