mybatis 学习二 MyBatis简介与配置MyBatis+Spring+MySql

1.2.2建立MySql数据库

在C:\Program Files\MySQL\MySQL Server 5.7\bin下面：

　　首先连接MySQL：        mysql  -u root -p

/* 建立数据库 */
CREATE DATABASE STUDENT_MANAGER;
USE STUDENT_MANAGER;  

/***** 建立student表 *****/
CREATE TABLE STUDENT_TBL
(
   STUDENT_ID         VARCHAR(255) PRIMARY KEY,
   STUDENT_NAME       VARCHAR(10) NOT NULL,
   STUDENT_SEX        VARCHAR(10),
   STUDENT_BIRTHDAY   DATE,
   CLASS_ID           VARCHAR(255)
);  

/*插入学生数据*/
INSERT INTO STUDENT_TBL (STUDENT_ID,
                         STUDENT_NAME,
                         STUDENT_SEX,
                         STUDENT_BIRTHDAY,
                         CLASS_ID)
  VALUES   (123456,
            ‘某某某‘,
            ‘女‘,
            ‘1980-08-01‘,
            121546
            )  

创建连接MySql使用的配置文件mysql.properties。

Mysql.properties代码  

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/student_manager?user=root&password=limingnihao&useUnicode=true&characterEncoding=UTF-8  

1.2.3搭建MyBatis环境

1.2.3.1创建实体类: StudentEntity

package com.deppon.test04.entity;

import java.io.Serializable;
import java.util.Date;

public class StudentEntity implements Serializable {  

    private static final long serialVersionUID = 3096154202413606831L;
    private Date studentBirthday;
    private String studentID;
    private String studentName;
    private String studentSex;  

    public Date getStudentBirthday() {
        return studentBirthday;
    }  

    public String getStudentID() {
        return studentID;
    }  

    public String getStudentName() {
        return studentName;
    }  

    public String getStudentSex() {
        return studentSex;
    }  

    public void setStudentBirthday(Date studentBirthday) {
        this.studentBirthday = studentBirthday;
    }  

    public void setStudentID(String studentID) {
        this.studentID = studentID;
    }  

    public void setStudentName(String studentName) {
        this.studentName = studentName;
    }  

    public void setStudentSex(String studentSex) {
        this.studentSex = studentSex;
    }
}  

1.2.3.2创建数据访问接口

Student类对应的dao接口：StudentMapper。

public interface StudentMapper {  

    public StudentEntity getStudent(String studentID);  

    public StudentEntity getStudentAndClass(String studentID);  

    public List<StudentEntity> getStudentAll();  

    public void insertStudent(StudentEntity entity);  

    public void deleteStudent(StudentEntity entity);  

    public void updateStudent(StudentEntity entity);
}  

1.2.3.3创建SQL映射语句文件

Student类的sql语句文件StudentMapper.xml
resultMap标签：表字段与属性的映射。
Select标签：查询sql。

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.deppon.test04.dao.StudentMapper">  

    <resultMap type="StudentEntity" id="studentResultMap">
        <id property="studentID" column="STUDENT_ID"/>
        <result property="studentName" column="STUDENT_NAME"/>
        <result property="studentSex" column="STUDENT_SEX"/>
        <result property="studentBirthday" column="STUDENT_BIRTHDAY"/>
    </resultMap>  

    <!-- 查询学生，根据id -->
    <select id="getStudent" parameterType="String" resultType="com.deppon.test04.entity.StudentEntity" resultMap="studentResultMap">
        <![CDATA[
            SELECT * from STUDENT_TBL ST
                WHERE ST.STUDENT_ID = #{studentID}
        ]]>
    </select>  

    <!-- 查询学生列表 -->
    <select id="getStudentAll"  resultType="com.deppon.test04.entity.StudentEntity" resultMap="studentResultMap">
        <![CDATA[
            SELECT * from STUDENT_TBL
        ]]>
    </select>  

</mapper>  

1.2.3.4创建MyBatis的mapper配置文件

在src/main/resource中创建MyBatis配置文件：mybatis-config.xml。typeAliases标签：给类起一个别名。com.manager.data.model.StudentEntity类，可以使用StudentEntity代替。Mappers标签：加载MyBatis中实体类的SQL映射语句文件。

<?xml version="1.0" encoding="UTF-8" ?>  

<!DOCTYPE configuration
  PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-config.dtd">  

<configuration>
    <!-- 全局别名设置，在映射文件中只需写别名，而不必写出整个类路径  -->
    <typeAliases>
         <typeAlias type="com.deppon.test04.entity.StudentEntity" alias="StudentEntity"/>
    </typeAliases>   

    <mappers>
        <mapper resource="src/main/resources/StudentMapper.xml" />
    </mappers>  

</configuration>  

1.2.3.5修改Spring 的配置文件

主要是添加SqlSession的制作工厂类的bean：SqlSessionFactoryBean，（在mybatis.spring包中）。需要指定配置文件位置和dataSource。
和数据访问接口对应的实现bean。通过MapperFactoryBean创建出来。需要执行接口类全称和SqlSession工厂bean的引用