spring养成计划 - spring基础 - (JdbcTemplate)

一 jabcTemplate概述

（一）jdbcTemplate作用

（二）创建jdbcTemplate对象

<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.xsd">
    <!--配置jdbcTemplate-->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/eesy"></property>
        <property name="username" value="root"></property>
        <property name="password" value="kwantler"></property>
    </bean>
</beans>

/**
 * JdbcTemplate的最基本用法
 */
public class JdbcTemplateDemo01 {
    public static void main(String[] args) {

        ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
        JdbcTemplate jt = ac.getBean("jdbcTemplate", JdbcTemplate.class);
        //jt.execute("insert into account (name, money) VALUES ('eee', 100)");
        // 添加
        //jt.update("insert into account (name, money) VALUES (?, ?)","fff", 2000);
        // 更新
        //jt.update("update account set name=?, money=? where id=?","aaa", 2000, 6);
        // 删除
        //jt.update("delete FROM account where id=?",6);
        // 查询所有
        /*List<Account> accounts = jt.query("select * from account where money>?", new BeanPropertyRowMapper<Account>(Account.class),1000f);
        for (Account acc: accounts) {
            System.out.println(acc);
        }*/
        // 查询一个
        /*List<Account> accounts = jt.query("select * from account where money>?", new BeanPropertyRowMapper<Account>(Account.class),500f);
        System.out.println(accounts.get(0));*/
        // 查询返回一行一列
        Integer count = jt.queryForObject("select count(*) from account where money>?",Integer.class,5000f);



    }
}
/*
class AccountRowMapper implements RowMapper<Account>{
    @Override
    public Account mapRow(ResultSet resultSet, int i) throws SQLException {
        Account account = new Account();
        account.setId(resultSet.getInt("id"));
        account.setName(resultSet.getString("name"));
        account.setMoney(resultSet.getFloat("money"));
        return account;
    }
}*/

• 方式2

<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.xsd">
    <bean id="accountDao" class="com.lc.dao.impl.AccountDaoImpl">
        <!--<property name="jdbcTemplate" ref="jdbcTemplate"></property>-->
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <!--配置jdbcTemplate-->
    <!--<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"></property>
    </bean>-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/eesy"></property>
        <property name="username" value="root"></property>
        <property name="password" value="kwantler"></property>
    </bean>
</beans>

继承JdbcDaoSupport 
public class AccountDaoImpl extends JdbcDaoSupport implements AccountDao {

    @Override
    public List<Account> findAll() {
        try {
            return super.getJdbcTemplate().query("select * from account", new BeanPropertyRowMapper<Account>(Account.class));
        } catch (Exception e) {
            throw new RuntimeException("列表查询");
        }
    }
}