今天主要是开发环境搭建

IDEA 跟MAVEN 安装没啥说的

然后是jdbcTemplate， 这个东西依赖了Spring的框架，所以需要在pom.xml 里增加对应的包

<!--mysql connector-->
    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.45</version>
    </dependency>
    <!--spring jdbc support-->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
    <version>${org.springframework.version}</version>
</dependency>
<dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>${org.springframework.version}</version>
</dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>${org.springframework.version}</version>
    </dependency>

然后就是applicationContext.xml 文件

主要是数据库连接属性的设置，这里并没有使用连接池技术，先实现简单的一些操作

<?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.xsd">


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

    <bean name="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/xiuzhen"/>
        <property name="username" value="root"/>
        <property name="password" value="root" />
    </bean>

    <bean name="userDaoImpl" class="com.bbq.dao.imple.UserDaoImpl">
        <property name="dbHandle" ref="jdbcTemplate"></property>
    </bean>

</beans>

然后写了Dao接口 简单的两个接口方法

package com.bbq.dao;

import com.bbq.beans.Student;

import java.util.List;

public interface UserDao {

    List<Student> getByName(String name);

    Student getById(int Id);
}

实现接口的类,这里主要是对数据库查询结果到实体的映射需要理解， 代码里是对每个字段逐一的赋值完成的，而且有多种的转换的方法（ResultSetExtractor，RowCallbackHandler，RowMapper）

但是本质上就是结果集到实体的转换

public class UserDaoImpl implements UserDao {
    private JdbcTemplate dbHandle;

    public JdbcTemplate getDbHandle() {
        return dbHandle;
    }

    public void setDbHandle(JdbcTemplate dbHandle) {
        this.dbHandle = dbHandle;
    }

    public List<Student> getByName(String name) {
        String sql = "select * from students where name='" + name+"'";
        return (List<Student>)dbHandle.query(sql, new RowMapper(){
            public Object mapRow(ResultSet rs, int rowNumber) throws SQLException{
                Student st = new Student();
                st.setName(rs.getString("name"));
                st.setQQ(rs.getString("QQ"));
                st.setEntryDate(rs.getDate("start_time"));
                st.setCareerype(rs.getInt("career_type"));
                st.setSchool(rs.getString("school"));
                st.setIdOnSite(rs.getString("online_id"));
                st.setDailyReportUrl(rs.getString("report_url"));
                st.setBrotherName(rs.getString("brother_name"));
                st.setCreateAt(rs.getLong("create_at"));
                st.setUpdateAt(rs.getLong("update_at"));
                return st;
            }
        });
    }

    public Student getById(int Id) {
        String sql = "select * from students where id=" + Id;
        return dbHandle.queryForObject(sql, new RowMapper<Student>() {
             public Student mapRow(ResultSet rs, int rowNumber) throws SQLException {
                Student st = new Student();
                st.setName(rs.getString("name"));
                st.setQQ(rs.getString("QQ"));
                st.setEntryDate(rs.getDate("start_time"));
                st.setCareerype(rs.getInt("career_type"));
                st.setSchool(rs.getString("school"));
                st.setIdOnSite(rs.getString("online_id"));
                st.setDailyReportUrl(rs.getString("report_url"));
                st.setBrotherName(rs.getString("brother_name"));
                st.setCreateAt(rs.getLong("create_at"));
                st.setUpdateAt(rs.getLong("update_at"));
                return st;
            }
        });
    }

    public static void main(String[] args){
        UserDaoImpl userDaoImp = new UserDaoImpl();
        Student st = userDaoImp.getById(1);
       System.out.println(st.getBrotherName());
    }
}

然后利用spring test框架对其测试了下，可以通过测试

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class TestStudentDao {

    @Autowired
    private UserDaoImpl userDaoImpl;

    @Test
    public  void testGetById(){
        Student st = userDaoImpl.getById(1);
        org.junit.Assert.assertEquals("张三", st.getName());
    }

    @Test
    public void testGetByName() {
        List<Student> stWithSameName = userDaoImpl.getByName("张三2");
        org.junit.Assert.assertEquals(1, stWithSameName.size());
    }
}

明天的任务：

     mybaits 同时学习junit测试，重写一遍测试