上一节我们使用JPA来进行数据库操作，这次我们集成MyBatis来操作数据库。Spring Boot与MyBatis集成有两种方式，一种是基于注解，一种是基于XML配置文件。我个人更喜欢使用XML方式，因为更直观，也更容易维护。喜欢使用注解的同学可以移步至http://www.mybatis.org/mybatis-3/zh/java-api.html��。
引入MyBatis及数据库相关依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-autoconfigure</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.1.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>com.zaxxer</groupId>
<artifactId>HikariCP</artifactId>
</dependency>
数据库配置文件
#HikariDataSource database settings
spring.datasource.type=com.zaxxer.hikari.HikariDataSource
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/spring_boot?characterEncoding=utf-8
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.maximum-pool-size=80
spring.datasource.max-idle=10
spring.datasource.max-active=150
spring.datasource.max-wait=10000
spring.datasource.min-idle=5
spring.datasource.initial-size=5
spring.datasource.validation-query=SELECT 1
spring.datasource.test-on-borrow=false
spring.datasource.test-while-idle=true
spring.datasource.time-between-eviction-runs-millis=18800
spring.datasource.jdbc-interceptors=ConnectionState;SlowQueryReport(threshold=0)
mybatis.mapper-locations=classpath*:com/bluecoffee/mapper/**/*Mapper.xml
mybatis.type-aliases-package=com.bluecoffee.domain.**
创建业务实体类
public class Book {
private Long bookId;
private String title;
private String author;
private Date createTime;
public Book(){}
public Book(Long bookId,String title,String author,Date createTime){
this.bookId = bookId;
this.title = title;
this.author = author;
this.createTime = createTime;
}
public Book(String title,String author,Date createTime){
this.title = title;
this.author = author;
this.createTime = createTime;
}
//省略getter/setter方法
}
创建数据库操作接口类
@Mapper
public interface BookDao {
Book getById(Long bookId);
void insertBook(Book book);
void deleteAll();
void updateByPrimaryKey(Book book);
List<Book> likeTitle(String title);
}
创建SqlMapper.xml文件
<?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.bluecoffee.repository.BookDao">
<resultMap id="bookMap" type="com.bluecoffee.domain.Book">
<id property="bookId" column="book_id" />
<result property="title" column="title" />
<result property="author" column="author" />
<result property="createTime" column="create_time" />
</resultMap>
<delete id="deleteAll">
delete from BOOK
</delete>
<insert id="insertBook" parameterType="com.bluecoffee.domain.Book">
INSERT
INTO BOOK(BOOK_ID,TITLE,AUTHOR,CREATE_TIME)
VALUES
(#{bookId},#{title},#{author},#{createTime})
</insert>
<select id="getById" resultMap="bookMap" resultType="com.bluecoffee.domain.Book">
SELECT *
FROM BOOK
WHERE book_id = #{bookId,jdbcType=BIGINT}
</select>
<select id="likeTitle" resultMap="bookMap" parameterType="string" resultType="java.util.List">
SELECT *
FROM BOOK
WHERE TITLE LIKE CONCAT('%',#{title},'%')
</select>
<update id="updateByPrimaryKey" parameterType="com.bluecoffee.domain.Book" >
update BOOK
<set >
<if test="title != null" >
title = #{title,jdbcType=VARCHAR},
</if>
<if test="author != null" >
author = #{author,jdbcType=VARCHAR},
</if>
<if test="createTime != null" >
create_time = #{createTime,jdbcType=TIMESTAMP},
</if>
</set>
where book_id = #{bookId,jdbcType=BIGINT}
</update>
</mapper>
完整的项目目录结构如下所示
工程目录
单元测试用例
@Test
public void testBook(){
try{
//删除所有书籍
bookDao.deleteAll();
//创建10本书
for(int i=1;i<=10;i++){
bookDao.insertBook(new Book(Long.parseLong(i + ""), "book" + i, "author" + i, new Date()));
}
//根据主键查询
Book book = bookDao.getById(Long.parseLong("9"));
Assert.assertEquals("book9",book.getTitle());
//根据主键更新
book.setBookId(Long.parseLong("9"));
book.setTitle("book9_update");
bookDao.updateByPrimaryKey(book);
Assert.assertEquals("book9_update",book.getTitle());
//根据书名模糊查询
List<Book> books = bookDao.likeTitle("book");
Assert.assertEquals(10,books.size());
}catch (Exception ex){
Assert.fail(ex.getMessage());
}
}
数据分页
数据分页有很多种方法，Github上有一个不错的插件，我觉得不错，分享一下，项目地址在Mybatis-PageHelper，下面介绍一下使用方法，详细的文档大家可以自己去Github上看看。
引入PageHelper依赖
<!-- 分页插件 begin-->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>4.2.1</version>
</dependency>
<dependency>
<groupId>com.github.jsqlparser</groupId>
<artifactId>jsqlparser</artifactId>
<version>0.9.5</version>
</dependency>
<!-- 分页插件 end-->
对PageHelper进行基本的配置，该配置必须在Spring Boot启动后就加载
package com.bluecoffee.configuration;
import com.github.pagehelper.PageHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.util.Properties;
/**
* MyBatis通用分页插件配置
*
* Created by bluecoffee on 16/12/19.
*/
@Configuration
public class MyBatisConfiguration {
private static final Logger logger = LoggerFactory.getLogger(MyBatisConfiguration.class);
@Bean
public PageHelper pageHelper() {
logger.info("MyBatis PageHelper Register");
PageHelper pageHelper = new PageHelper();
Properties p = new Properties();
p.setProperty("offsetAsPageNum", "true");
p.setProperty("rowBoundsWithCount", "true");
p.setProperty("pageSizeZero", "true");
p.setProperty("reasonable", "false");
pageHelper.setProperties(p);
return pageHelper;
}
}
对分页进行单元测试
@Test
public void testPage(){
try{
//删除所有书籍
bookDao.deleteAll();
//创建8本书
for(int i=1;i<=8;i++){
bookDao.insertBook(new Book(Long.parseLong(i + ""), "book" + i, "author" + i, new Date()));
}
//根据书名模糊查询,返回第一页数据,每页最多5条数据
PageHelper.startPage(1, 5);
List<Book> books = bookDao.likeTitle("book");
Assert.assertEquals(5,books.size());
PageHelper.startPage(2, 5);
books = bookDao.likeTitle("book");
Assert.assertEquals(3,books.size());
}catch (Exception ex){
Assert.fail(ex.getMessage());
}
}
