Spring boot后台搭建一使用MyBatis集成Mapper和PageHelper

目标：

　　使用 Spring boot+MyBatis+mysql 集成 Mapper 和 PageHelper，实现基本的增删改查

先建一个基本的 Spring Boot 项目开启 Spring Boot 参考

使用的 spring boot 版本为 2.1.6.RELEASE

1.集成MyBatis

　　引入mybatis-spring-boot-starter和数据库连接驱动

　　修改pom.xml

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.0.1</version>
</dependency>

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <scope>runtime</scope>
</dependency>

2.Druid数据源

Druid是一个关系型数据库连接池

阿里巴巴数据库事业部出品，为监控而生的数据库连接池。https://github.com/alibaba/druid

　　（1）引入依赖

　　　　修改pom.xml

<!-- druid数据源驱动 -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid-spring-boot-starter</artifactId>
    <version>1.1.16</version>
</dependency>

　　（2）配置

　　在 src/main/resources/application.properties 里添加

# 数据库访问配置, 使用druid数据源
spring.datasource.druid.db-type=mysql
spring.datasource.druid.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.druid.url = jdbc:mysql://127.0.0.1:3306/bms?useUnicode=true&characterEncoding=UTF-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC&zeroDateTimeBehavior=convertToNull
spring.datasource.druid.username=root
spring.datasource.druid.password=root
# 连接池配置
spring.datasource.druid.initial-size=5
spring.datasource.druid.min-idle=5
spring.datasource.druid.max-active=20
# 配置获取连接等待超时的时间
spring.datasource.druid.max-wait=30000
# 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
spring.datasource.druid.time-between-eviction-runs-millis=60000
# 配置一个连接在池中最小生存的时间，单位是毫秒
spring.datasource.druid.min-evictable-idle-time-millis=300000
spring.datasource.druid.validation-query= select '1' from dual
spring.datasource.druid.test-while-idle=true
spring.datasource.druid.test-on-borrow=false
spring.datasource.druid.test-on-return=false
# 打开PSCache，并且指定每个连接上PSCache的大小
spring.datasource.druid.pool-prepared-statements=true
spring.datasource.druid.max-open-prepared-statements=20
spring.datasource.druid.max-pool-prepared-statement-per-connection-size=20
# 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
spring.datasource.druid.filters=stat,wall

# WebStatFilter配置
spring.datasource.druid.web-stat-filter.enabled=true
spring.datasource.druid.web-stat-filter.url-pattern=/*
spring.datasource.druid.web-stat-filter.exclusions='*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*'

#是否启用StatFilter默认值true
spring.datasource.druid.stat-view-servlet.enabled=true
# 访问路径为/druid时，跳转到StatViewServlet
spring.datasource.druid.stat-view-servlet.url-pattern=/druid/*

#druid监控管理界面登录帐号
spring.datasource.druid.stat-view-servlet.login-username=admin
#druid监控管理界面登录密码
spring.datasource.druid.stat-view-servlet.login-password=123456
spring.datasource.druid.stat-view-servlet.allow=127.0.0.1
#是否开启重置功能
druid.monitor.resetEnable=false

# 配置StatFilter
spring.datasource.druid.filter.stat.log-slow-sql=true

　　配置了Druid作为连接池，并开启了Druid的监控功能

　　（3）运行项目

　　浏览器打开http://localhost:8080/druid/login.html

Spring boot后台搭建一使用MyBatis集成Mapper和PageHelper

　　输入配置的用户名admin和密码123456登录后

Spring boot后台搭建一使用MyBatis集成Mapper和PageHelper

3.集成通用Mapper和PageHelper分页插件

可以简化工作：

　　通用Mapper可以简化对单表的CRUD操作

　　PageHelper分页插件可以自动拼接分页SQL

　　可以使用MyBatis Geneator来自动生成实体类，Mapper接口和Mapper xml代码

　　（1）引入依赖

　　　　修改pom.xml

　　　　<1>通用Mapper和PageHelper

<!-- 通用mapper -->
<dependency>
    <groupId>tk.mybatis</groupId>
    <artifactId>mapper-spring-boot-starter</artifactId>
    <version>2.1.5</version>
</dependency>
<!-- pagehelper 分页插件 -->
<dependency>
    <groupId>com.github.pagehelper</groupId>
    <artifactId>pagehelper-spring-boot-starter</artifactId>
    <version>1.2.10</version>
</dependency>

　　　　<2>MyBatis Geneator

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
        <plugin>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-maven-plugin</artifactId>
            <version>1.3.7</version>
            <dependencies>
                <dependency>
                     <groupId>mysql</groupId>
                     <artifactId>mysql-connector-java</artifactId>
                     <version>${mysql.version}</version>
                </dependency>
                <dependency>
                     <groupId>tk.mybatis</groupId>
                     <artifactId>mapper</artifactId>
                     <version>4.1.5</version>
                </dependency>
            </dependencies>
            <executions>
                <execution>
                    <id>Generate MyBatis Artifacts</id>
                    <phase>package</phase>
                    <goals>
                        <goal>generate</goal>
                    </goals>
                </execution>
            </executions>
            <configuration>
                <!--允许移动生成的文件 -->
                <verbose>true</verbose>
                <!-- 是否覆盖 -->
                <overwrite>true</overwrite>
                <!-- 自动生成的配置 -->
                <configurationFile>src/main/resources/mybatis-generator.xml</configurationFile>
            </configuration>
        </plugin>
   </plugins>
</build>

　　（2）配置

　　　　<1>配置MyBatis

　　　　修改src/main/resources/application.properties

# type-aliases扫描路径
mybatis.type-aliases-package=com.sfn.bms.system.model
# mapper xml实现扫描路径
mybatis.mapper-locations=classpath:mapper/*xml

　　　　<2>配置通用Mapper

　　　　修改src/main/resources/application.properties

mapper.mappers=com.sfn.bms.common.config.MyMapper
mapper.not-empty=false
mapper.identity=MYSQL

　　　　定义MyMapper接口　

package com.sfn.bms.common.config;

import tk.mybatis.mapper.common.Mapper;
import tk.mybatis.mapper.common.MySqlMapper;

public interface MyMapper<T> extends Mapper<T>, MySqlMapper<T> {
    
}

　　注：

　　　　该接口不能被扫描到，自己定义的Mapper都需要继承这个接口

　　　　<3>配置PageHelper

　　　　修改src/main/resources/application.properties

pagehelper.helper-dialect=mysql
pagehelper.reasonable=true
pagehelper.support-methods-arguments=true
pagehelper.params=count=countsql

　　　　<4>配置Geneator

　　　　在src/main/resources 下新建 mybatis-generator.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
    <context id="testTables" targetRuntime="MyBatis3Simple" defaultModelType="flat">

        <plugin type="tk.mybatis.mapper.generator.MapperPlugin">
            <!-- 该配置会使生产的Mapper自动继承MyMapper -->
            <property name="mappers" value="com.sfn.bms.common.config.MyMapper" />
            <!-- caseSensitive默认false，当数据库表名区分大小写时，可以将该属性设置为true -->
            <property name="caseSensitive" value="false"/>
        </plugin>

        <!-- 阻止生成自动注释 -->
        <commentGenerator>
            <property name="javaFileEncoding" value="UTF-8"/>
            <property name="suppressDate" value="true"/>
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>

        <!-- 数据库链接地址账号密码 -->
        <jdbcConnection
                driverClass="com.mysql.cj.jdbc.Driver"
                connectionURL="jdbc:mysql://localhost:3306/bms?serverTimezone=Asia/Shanghai&amp;nullCatalogMeansCurrent=true"
                userId="root"
                password="root">
        </jdbcConnection>

        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>

        <!-- 生成Model类存放位置 -->
        <javaModelGenerator targetPackage="com.sfn.bms.system.model" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>

        <!-- 生成映射文件存放位置 -->
        <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>

        <!-- 生成Dao类存放位置 -->
        <!-- 客户端代码，生成易于使用的针对Model对象和XML配置文件的代码
            type="ANNOTATEDMAPPER",生成Java Model 和基于注解的Mapper对象
            type="XMLMAPPER",生成SQLMap XML文件和独立的Mapper接口 -->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.sfn.bms.system.mapper" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>

        <!-- 配置需要生成的表 -->
        <table tableName="T_USER" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false">
            <generatedKey column="id" sqlStatement="mysql" identity="true"/>
        </table>
    </context>
</generatorConfiguration>

　　（3）代码生成

　　　　run—》edit configurations

　　　　command line：mybatis-generator:generate -e

Spring boot后台搭建一使用MyBatis集成Mapper和PageHelper

　　　　执行后输出

"C:\Program Files\Java\jdk1.8.0_151\bin\java" -Dmaven.multiModuleProjectDirectory=E:\java\project\newbms "-Dmaven.home=D:\Program Files\JetBrains\IntelliJ IDEA 2017.3.5\plugins\maven\lib\maven3" "-Dclassworlds.conf=D:\Program Files\JetBrains\IntelliJ IDEA 2017.3.5\plugins\maven\lib\maven3\bin\m2.conf" "-javaagent:D:\Program Files\JetBrains\IntelliJ IDEA 2017.3.5\lib\idea_rt.jar=8709:D:\Program Files\JetBrains\IntelliJ IDEA 2017.3.5\bin" -Dfile.encoding=UTF-8 -classpath "D:\Program Files\JetBrains\IntelliJ IDEA 2017.3.5\plugins\maven\lib\maven3\boot\plexus-classworlds-2.5.2.jar" org.codehaus.classworlds.Launcher -Didea.version=2017.3.5 mybatis-generator:generate -e
[INFO] Error stacktraces are turned on.
[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building bms 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- mybatis-generator-maven-plugin:1.3.7:generate (default-cli) @ bms ---
[INFO] Connecting to the Database
[INFO] Introspecting table USER
[INFO] Generating Record class for table user
[INFO] Generating Mapper Interface for table user
[INFO] Generating SQL Map for table user
[INFO] Saving file UserMapper.xml
[INFO] Saving file User.java
[INFO] Saving file UserMapper.java
[WARNING] Existing file E:\java\project\newbms\src\main\java\com\sfn\bms\system\model\User.java was overwritten
[WARNING] Existing file E:\java\project\newbms\src\main\java\com\sfn\bms\system\mapper\UserMapper.java was overwritten
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.720 s
[INFO] Finished at: 2019-06-21T12:43:01+08:00
[INFO] Final Memory: 27M/398M
[INFO] ------------------------------------------------------------------------

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