JdbcTemplate模板的增删改查

1、在application.xml中配置了连接池数据源c3p0

<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver"/>
        <property name="jdbcUrl" value="jdbc:mysql:///demo"/>
        <property name="user" value="root"/>
        <property name="password" value="root"/>
</bean>

2、JdbcTemplate模板注入容器，并配置数据源属性

<bean name="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"/>
</bean>

3、把自己调用的接口注入容器，并配置JdbcTemplate模板属性(xm方法配置属性注意写set)

<bean name="userDao" class="com.spring.riview.a_jdbcemplate.UserDaoImpl">
        <property name="jt" ref="jdbcTemplate"/>
</bean

4、在自己的实现类中书写sql

package com.spring.riview.a_jdbcemplate;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

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

import com.spring.riview.entity.User;
//JdBc模板实现
public class UserDaoImpl implements UserDao {
    
    private JdbcTemplate jt;
    
    public void setJt(JdbcTemplate jt) {
        this.jt = jt;
    }

    @Override
    public void save(User user) {
        String sql = "insert into t_user values(null,?,?)";
        jt.update(sql, user.getName(),user.getAge());
    }

    @Override
    public void delete(Integer id) {
        String sql = "delete from t_user where id=?";
        jt.update(sql, id);
    }

    @Override
    public void update(User user) {
        String sql = "update t_user set name=?,age=? where id = ?";
        jt.update(sql, user.getName(),user.getAge(),user.getId());

    }

    @Override//查找一个封装为对象
    public User getById(Integer id) {
        String sql = "select * from t_user  where id = ?";
        User user = jt.queryForObject(sql, new RowMapper<User>(){
            @Override
            public User mapRow(ResultSet rs, int arg1) throws SQLException {
                User user =    new User(rs.getInt("id"), rs.getString("name"), rs.getString("age"));
                return user;
            }},id);
        return user;
    }

    @Override//统计个数
    public int getToalCount() {
        String sql = "select count(id) from t_user";
        int num = jt.queryForObject(sql, Integer.class);
        return num;
    }

    @Override//查找所有封装为list<User>
    public List<User> list() {
        String sql = "select * from t_user";
        List<User> list = jt.query(sql,  new RowMapper<User>(){
            @Override
            public User mapRow(ResultSet rs, int arg1) throws SQLException {
                User user =    new User(rs.getInt("id"), rs.getString("name"), rs.getString("age"));
                return user;
            }});
        return list;
    }
    
}

5、在测试（业务）方法中调用

需要用到的包

JdbcTemplate模板的增删改查

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