SpringBoot二十九：Mybatis****

pom文件引入以下依赖

<dependencies>
	<dependency>
		<groupId>mysql</groupId>
		<artifactId>mysql-connector-java</artifactId>
	</dependency>
	<dependency>
		<groupId>org.mybatis.spring.boot</groupId>
		<artifactId>mybatis-spring-boot-starter</artifactId>
		<version>1.1.1</version>
	</dependency>
	<dependency>
		<groupId>org.mybatis.generator</groupId>
		<artifactId>mybatis-generator-core</artifactId>
		<version>1.3.2</version>
	</dependency>
</dependencies>

mybatis****插件

<build>
	<plugins>
		<!-- mybatis****插件 -->
		<plugin>
			<groupId>org.mybatis.generator</groupId>
			<artifactId>mybatis-generator-maven-plugin</artifactId>
			<version>1.3.2</version>
		</plugin>
	</plugins>
</build>

generator的配置文件generatorConfig.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>
	<!--导入属性配置 -->
	<properties resource="datasource.properties"></properties>

	<!--指定特定数据库的jdbc驱动jar包的位置 -->
	<classPathEntry location="${db.driverLocation}" />
	<!-- <classPathEntry
		location="D:/Java/Maven/reponsitory/mysql/mysql-connector-java/5.1.45/mysql-connector-java-5.1.45.jar" /> -->

	<context id="default" targetRuntime="MyBatis3">

		<!-- 一些工具 生成的实体类时的一些方法 -->
		<plugin type="org.mybatis.generator.plugins.SerializablePlugin"></plugin>
		<!--<plugin type="org.mybatis.generator.plugins.EqualsHashCodePlugin"></plugin> -->
		<!--<plugin type="org.mybatis.generator.plugins.ToStringPlugin"></plugin> -->

		<!-- optional，旨在创建class时，对注释进行控制 -->
		<commentGenerator>
			<!-- 插入一个日期字段 -->
			<property name="suppressDate" value="true" />
			<!-- 是否去除自动生成的注释 true：是 ： false:否 -->
			<property name="suppressAllComments" value="true" />
		</commentGenerator>

		<!--jdbc的数据库连接 -->
		<jdbcConnection driverClass="${db.driverClassName}"
			connectionURL="${db.url}" userId="${db.username}"
			password="${db.password}">
		</jdbcConnection>


		<!-- 非必需，类型处理器，在数据库类型和java类型之间的转换控制 -->
		<javaTypeResolver>
			<!-- This property is used to specify whether MyBatis Generator should 
				force the use of java.math.BigDecimal for DECIMAL and NUMERIC fields, -->
			<!-- 默认false，把JDBC DECIMAL 和 NUMERIC 类型解析为 Integer，为 true时把JDBC DECIMAL 
				和 NUMERIC 类型解析为java.math.BigDecimal -->
			<property name="forceBigDecimals" value="false" />
		</javaTypeResolver>


		<!-- Model模型生成器,用来生成含有主键key的类，记录类 以及查询Example类 targetPackage 指定生成的model生成所在的包名 
			targetProject 指定在该项目下所在的路径 -->
		<javaModelGenerator
			targetPackage="cn.com.javakf.po" targetProject="./src/main/java">
			<!-- 是否允许子包，即targetPackage.schemaName.tableName -->
			<property name="enableSubPackages" value="false" />
			<!-- 是否对model添加 构造函数 -->
			<property name="constructorBased" value="true" />
			<!-- 是否对类CHAR类型的列的数据进行trim操作 -->
			<property name="trimStrings" value="true" />
			<!-- 建立的Model对象是否 不可改变 即生成的Model对象不会有 setter方法，只有构造方法 -->
			<property name="immutable" value="false" />
		</javaModelGenerator>

		<!--mapper映射文件生成所在的目录 为每一个数据库的表生成对应的SqlMap文件 -->
		<sqlMapGenerator targetPackage="cn.com.javakf.mapper"
			targetProject="./src/main/java">
			<property name="enableSubPackages" value="false" />
		</sqlMapGenerator>

		<!-- targetPackage：mapper接口dao生成的位置 -->
		<javaClientGenerator type="XMLMAPPER"
			targetPackage="cn.com.javakf.mapper" targetProject="./src/main/java">
			<!-- enableSubPackages:是否让schema作为包的后缀 -->
			<property name="enableSubPackages" value="false" />
		</javaClientGenerator>


		<!-- 配置表信息 -->
		<!-- schema即为数据库名 tableName为对应的数据库表 domainObjectName是要生成的实体类 enable*ByExample 
			是否生成 example类 个人觉得生成那么多的example类很繁琐，因此设置为false -->
		<table schema="mybatis" tableName="user" domainObjectName="user"
			enableCountByExample="false" enableDeleteByExample="false"
			enableSelectByExample="false" enableUpdateByExample="false">
		</table>

		<table schema="mybatis" tableName="orders"
			domainObjectName="orders" enableCountByExample="false"
			enableDeleteByExample="false" enableSelectByExample="false"
			enableUpdateByExample="false">
		</table>
	</context>

</generatorConfiguration>

数据库配置信息datasource.properties

db.driverLocation=D:/Java/Maven/reponsitory/mysql/mysql-connector-java/5.1.45/mysql-connector-java-5.1.45.jar
db.driverClassName=com.mysql.jdbc.Driver
db.url=jdbc:mysql://127.0.0.1:3306/mybatis
db.username=root
db.password=123456

运行方式1：运行generator，自动生成代码

右击项目名：Run as–>maven build,在Goals:mybatis-generator:generate

运行方式2：main运行generator，自动生成代码

public class Generator {
	public void generator() throws Exception {

		List<String> warnings = new ArrayList<String>();
		boolean overwrite = true;
		// 指定****配置文件
		String genCfg = "/generatorConfig.xml";
		File configFile = new File(Generator.class.getResource(genCfg).getFile());
		ConfigurationParser cp = new ConfigurationParser(warnings);
		Configuration config = cp.parseConfiguration(configFile);
		DefaultShellCallback callback = new DefaultShellCallback(overwrite);
		MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
		myBatisGenerator.generate(null);

	}

	public static void main(String[] args) throws Exception {
		try {
			Generator generator = new Generator();
			generator.generator();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}

报错1：

Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
Caused by: com.mysql.cj.exceptions.InvalidConnectionAttributeException: The server time zone value '�й���׼ʱ��' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.

解决：修改datasource.properties

db.driverLocation=D:/Java/Maven/reponsitory/mysql/mysql-connector-java/5.1.45/mysql-connector-java-5.1.45.jar
db.driverClassName=com.mysql.cj.jdbc.Driver
db.url=jdbc:mysql://localhost:3306/mybatis?useUnicode=true&characterEncoding=utf8&serverTimezone=UTC  
db.username=root
db.password=123456

报错2：自动生成mybatis实体类时多出了***WithBLOBs

解决：修改generatorConfig.xml

<property name="nullCatalogMeansCurrent" value="true" />

代码托管：springboot_mybatis_generator