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原文链接：https://blog.csdn.net/qq_16804847/article/details/116227307

1.1 环境切换

1.1.1 业务需求

软件一般会在多个不同的环境中运行. 开发阶段有一个dev环境.开发完成会进行测试.则会有测试环境.最终项目部署到用户的服务中 生产环境.
问题: 如果每次切换环境,如果都需要手动的修改配置文件,则造成诸多的不便.
需求: 如果能够简化环境切换带来的影响.

1.1.2 多环境编辑

要求: 如果采用多环境测试,则要求每个环境中的数据项都应该保持一致. 否则缺失可能导致项目启动异常.
多环境配置: 关键语法"—" 环境分割
定义环境名称:

spring:
  config:
    activate:
      on-profile: prod

 
 
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默认环境名称:

#默认环境选项
spring:
  profiles:
    #默认环境配置名称
    active: test

 
 
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全部配置:

#默认环境选项
spring:
  profiles:
    #默认环境配置名称
    active: test

#环境分割

#YML文件语法

1.YML数据结构k-v结构

2.k与v 需要使用 :“空格” 连接

3.YMl配置文件有父子级关系 所以注意缩进项的位置

spring:
config:
activate:
on-profile: prod
server:
port: 80 #配置端口
servlet: #web项目发布路径
context-path: / #/表示根目录

#定义dept属性值 YML文件默认支持UTF-8
dept:
id: 100
name: 财务部

#环境分割线

每个环境都应该有自己的名称

spring:
config:
activate:
on-profile: test
server:
port: 8080 #配置端口
servlet: #web项目发布路径
context-path: / #/表示根目录

#定义dept属性值 YML文件默认支持UTF-8
dept:
id: 100
name: 集團本部

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1.2 热部署

1.2.1 需求说明

在开发阶段每次修改完源码都要重启服务器,程序才能生效. 能否让程序自动的完成监控,重启服务器.

1.2.2 引入jar包

		<!--支持热部署 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
		</dependency>

 
 
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1.2.3 配置IDEA环境

组合键: ctrl + shift + alt + / 或者 ctrl + alt + a

2.勾选自动编译

3).启动IDEA自动编译

2. SpringBoot整合Mybatis

2.1 导入数据库

2.1.1 安装SqlYog

1).解压安装包

2).运行sql文件
根据资料中的破解码 完成破解 输入用户名和密码 点解链接

3).正确的展现

2.1.2 导入数据库

1).新建数据库

2).导入数据

2.2 创建SpringBoot项目

2.2.1 创建项目

2.2.2 导入POM.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.jt</groupId>
	<artifactId>springboot_demo_2</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>springboot_demo_2</name>
	<description>Demo project for Spring Boot</description>
<span class="token generics function"><span class="token punctuation">&lt;</span>parent<span class="token punctuation">&gt;</span></span>
	<span class="token generics function"><span class="token punctuation">&lt;</span>groupId<span class="token punctuation">&gt;</span></span>org<span class="token punctuation">.</span>springframework<span class="token punctuation">.</span>boot<span class="token operator">&lt;</span><span class="token operator">/</span>groupId<span class="token operator">&gt;</span>
	<span class="token generics function"><span class="token punctuation">&lt;</span>artifactId<span class="token punctuation">&gt;</span></span>spring<span class="token operator">-</span>boot<span class="token operator">-</span>starter<span class="token operator">-</span>parent<span class="token operator">&lt;</span><span class="token operator">/</span>artifactId<span class="token operator">&gt;</span>
	<span class="token generics function"><span class="token punctuation">&lt;</span>version<span class="token punctuation">&gt;</span></span><span class="token number">2.4</span><span class="token number">.5</span><span class="token operator">&lt;</span><span class="token operator">/</span>version<span class="token operator">&gt;</span>
	<span class="token operator">&lt;</span>relativePath<span class="token operator">/</span><span class="token operator">&gt;</span> <span class="token operator">&lt;</span><span class="token operator">!</span><span class="token operator">--</span> lookup parent from repository <span class="token operator">--</span><span class="token operator">&gt;</span>
<span class="token operator">&lt;</span><span class="token operator">/</span>parent<span class="token operator">&gt;</span>

<span class="token generics function"><span class="token punctuation">&lt;</span>properties<span class="token punctuation">&gt;</span></span>
	<span class="token generics function"><span class="token punctuation">&lt;</span>java<span class="token punctuation">.</span>version<span class="token punctuation">&gt;</span></span><span class="token number">1.8</span><span class="token operator">&lt;</span><span class="token operator">/</span>java<span class="token punctuation">.</span>version<span class="token operator">&gt;</span>
<span class="token operator">&lt;</span><span class="token operator">/</span>properties<span class="token operator">&gt;</span>
<span class="token generics function"><span class="token punctuation">&lt;</span>dependencies<span class="token punctuation">&gt;</span></span>

	<span class="token operator">&lt;</span><span class="token operator">!</span><span class="token operator">--</span>spring<span class="token operator">-</span>boot<span class="token operator">-</span>starter 启动项  只要导入jar包 则可以完成自动的配置
		暂时没有数据库的链接
	<span class="token operator">--</span><span class="token operator">&gt;</span>
	<span class="token generics function"><span class="token punctuation">&lt;</span>dependency<span class="token punctuation">&gt;</span></span>
		<span class="token generics function"><span class="token punctuation">&lt;</span>groupId<span class="token punctuation">&gt;</span></span>org<span class="token punctuation">.</span>springframework<span class="token punctuation">.</span>boot<span class="token operator">&lt;</span><span class="token operator">/</span>groupId<span class="token operator">&gt;</span>
		<span class="token generics function"><span class="token punctuation">&lt;</span>artifactId<span class="token punctuation">&gt;</span></span>spring<span class="token operator">-</span>boot<span class="token operator">-</span>starter<span class="token operator">-</span>jdbc<span class="token operator">&lt;</span><span class="token operator">/</span>artifactId<span class="token operator">&gt;</span>
	<span class="token operator">&lt;</span><span class="token operator">/</span>dependency<span class="token operator">&gt;</span>

	<span class="token operator">&lt;</span><span class="token operator">!</span><span class="token operator">--</span>引入数据库驱动 <span class="token operator">--</span><span class="token operator">&gt;</span>
	<span class="token generics function"><span class="token punctuation">&lt;</span>dependency<span class="token punctuation">&gt;</span></span>
		<span class="token generics function"><span class="token punctuation">&lt;</span>groupId<span class="token punctuation">&gt;</span></span>mysql<span class="token operator">&lt;</span><span class="token operator">/</span>groupId<span class="token operator">&gt;</span>
		<span class="token generics function"><span class="token punctuation">&lt;</span>artifactId<span class="token punctuation">&gt;</span></span>mysql<span class="token operator">-</span>connector<span class="token operator">-</span>java<span class="token operator">&lt;</span><span class="token operator">/</span>artifactId<span class="token operator">&gt;</span>
		<span class="token generics function"><span class="token punctuation">&lt;</span>scope<span class="token punctuation">&gt;</span></span>runtime<span class="token operator">&lt;</span><span class="token operator">/</span>scope<span class="token operator">&gt;</span>
	<span class="token operator">&lt;</span><span class="token operator">/</span>dependency<span class="token operator">&gt;</span>

	<span class="token generics function"><span class="token punctuation">&lt;</span>dependency<span class="token punctuation">&gt;</span></span>
		<span class="token generics function"><span class="token punctuation">&lt;</span>groupId<span class="token punctuation">&gt;</span></span>org<span class="token punctuation">.</span>springframework<span class="token punctuation">.</span>boot<span class="token operator">&lt;</span><span class="token operator">/</span>groupId<span class="token operator">&gt;</span>
		<span class="token generics function"><span class="token punctuation">&lt;</span>artifactId<span class="token punctuation">&gt;</span></span>spring<span class="token operator">-</span>boot<span class="token operator">-</span>starter<span class="token operator">-</span>web<span class="token operator">&lt;</span><span class="token operator">/</span>artifactId<span class="token operator">&gt;</span>
	<span class="token operator">&lt;</span><span class="token operator">/</span>dependency<span class="token operator">&gt;</span>
	<span class="token generics function"><span class="token punctuation">&lt;</span>dependency<span class="token punctuation">&gt;</span></span>
		<span class="token generics function"><span class="token punctuation">&lt;</span>groupId<span class="token punctuation">&gt;</span></span>org<span class="token punctuation">.</span>mybatis<span class="token punctuation">.</span>spring<span class="token punctuation">.</span>boot<span class="token operator">&lt;</span><span class="token operator">/</span>groupId<span class="token operator">&gt;</span>
		<span class="token generics function"><span class="token punctuation">&lt;</span>artifactId<span class="token punctuation">&gt;</span></span>mybatis<span class="token operator">-</span>spring<span class="token operator">-</span>boot<span class="token operator">-</span>starter<span class="token operator">&lt;</span><span class="token operator">/</span>artifactId<span class="token operator">&gt;</span>
		<span class="token generics function"><span class="token punctuation">&lt;</span>version<span class="token punctuation">&gt;</span></span><span class="token number">2.1</span><span class="token number">.4</span><span class="token operator">&lt;</span><span class="token operator">/</span>version<span class="token operator">&gt;</span>
	<span class="token operator">&lt;</span><span class="token operator">/</span>dependency<span class="token operator">&gt;</span>

	<span class="token generics function"><span class="token punctuation">&lt;</span>dependency<span class="token punctuation">&gt;</span></span>
		<span class="token generics function"><span class="token punctuation">&lt;</span>groupId<span class="token punctuation">&gt;</span></span>org<span class="token punctuation">.</span>springframework<span class="token punctuation">.</span>boot<span class="token operator">&lt;</span><span class="token operator">/</span>groupId<span class="token operator">&gt;</span>
		<span class="token generics function"><span class="token punctuation">&lt;</span>artifactId<span class="token punctuation">&gt;</span></span>spring<span class="token operator">-</span>boot<span class="token operator">-</span>devtools<span class="token operator">&lt;</span><span class="token operator">/</span>artifactId<span class="token operator">&gt;</span>
		<span class="token generics function"><span class="token punctuation">&lt;</span>scope<span class="token punctuation">&gt;</span></span>runtime<span class="token operator">&lt;</span><span class="token operator">/</span>scope<span class="token operator">&gt;</span>
		<span class="token generics function"><span class="token punctuation">&lt;</span>optional<span class="token punctuation">&gt;</span></span><span class="token boolean">true</span><span class="token operator">&lt;</span><span class="token operator">/</span>optional<span class="token operator">&gt;</span>
	<span class="token operator">&lt;</span><span class="token operator">/</span>dependency<span class="token operator">&gt;</span>

	<span class="token generics function"><span class="token punctuation">&lt;</span>dependency<span class="token punctuation">&gt;</span></span>
		<span class="token generics function"><span class="token punctuation">&lt;</span>groupId<span class="token punctuation">&gt;</span></span>org<span class="token punctuation">.</span>projectlombok<span class="token operator">&lt;</span><span class="token operator">/</span>groupId<span class="token operator">&gt;</span>
		<span class="token generics function"><span class="token punctuation">&lt;</span>artifactId<span class="token punctuation">&gt;</span></span>lombok<span class="token operator">&lt;</span><span class="token operator">/</span>artifactId<span class="token operator">&gt;</span>
		<span class="token generics function"><span class="token punctuation">&lt;</span>optional<span class="token punctuation">&gt;</span></span><span class="token boolean">true</span><span class="token operator">&lt;</span><span class="token operator">/</span>optional<span class="token operator">&gt;</span>
	<span class="token operator">&lt;</span><span class="token operator">/</span>dependency<span class="token operator">&gt;</span>
	<span class="token generics function"><span class="token punctuation">&lt;</span>dependency<span class="token punctuation">&gt;</span></span>
		<span class="token generics function"><span class="token punctuation">&lt;</span>groupId<span class="token punctuation">&gt;</span></span>org<span class="token punctuation">.</span>springframework<span class="token punctuation">.</span>boot<span class="token operator">&lt;</span><span class="token operator">/</span>groupId<span class="token operator">&gt;</span>
		<span class="token generics function"><span class="token punctuation">&lt;</span>artifactId<span class="token punctuation">&gt;</span></span>spring<span class="token operator">-</span>boot<span class="token operator">-</span>starter<span class="token operator">-</span>test<span class="token operator">&lt;</span><span class="token operator">/</span>artifactId<span class="token operator">&gt;</span>
		<span class="token generics function"><span class="token punctuation">&lt;</span>scope<span class="token punctuation">&gt;</span></span>test<span class="token operator">&lt;</span><span class="token operator">/</span>scope<span class="token operator">&gt;</span>
	<span class="token operator">&lt;</span><span class="token operator">/</span>dependency<span class="token operator">&gt;</span>
<span class="token operator">&lt;</span><span class="token operator">/</span>dependencies<span class="token operator">&gt;</span>

<span class="token generics function"><span class="token punctuation">&lt;</span>build<span class="token punctuation">&gt;</span></span>
	<span class="token generics function"><span class="token punctuation">&lt;</span>plugins<span class="token punctuation">&gt;</span></span>
		<span class="token generics function"><span class="token punctuation">&lt;</span>plugin<span class="token punctuation">&gt;</span></span>
			<span class="token generics function"><span class="token punctuation">&lt;</span>groupId<span class="token punctuation">&gt;</span></span>org<span class="token punctuation">.</span>springframework<span class="token punctuation">.</span>boot<span class="token operator">&lt;</span><span class="token operator">/</span>groupId<span class="token operator">&gt;</span>
			<span class="token generics function"><span class="token punctuation">&lt;</span>artifactId<span class="token punctuation">&gt;</span></span>spring<span class="token operator">-</span>boot<span class="token operator">-</span>maven<span class="token operator">-</span>plugin<span class="token operator">&lt;</span><span class="token operator">/</span>artifactId<span class="token operator">&gt;</span>
			<span class="token generics function"><span class="token punctuation">&lt;</span>configuration<span class="token punctuation">&gt;</span></span>
				<span class="token generics function"><span class="token punctuation">&lt;</span>excludes<span class="token punctuation">&gt;</span></span>
					<span class="token generics function"><span class="token punctuation">&lt;</span>exclude<span class="token punctuation">&gt;</span></span>
						<span class="token generics function"><span class="token punctuation">&lt;</span>groupId<span class="token punctuation">&gt;</span></span>org<span class="token punctuation">.</span>projectlombok<span class="token operator">&lt;</span><span class="token operator">/</span>groupId<span class="token operator">&gt;</span>
						<span class="token generics function"><span class="token punctuation">&lt;</span>artifactId<span class="token punctuation">&gt;</span></span>lombok<span class="token operator">&lt;</span><span class="token operator">/</span>artifactId<span class="token operator">&gt;</span>
					<span class="token operator">&lt;</span><span class="token operator">/</span>exclude<span class="token operator">&gt;</span>
				<span class="token operator">&lt;</span><span class="token operator">/</span>excludes<span class="token operator">&gt;</span>
			<span class="token operator">&lt;</span><span class="token operator">/</span>configuration<span class="token operator">&gt;</span>
		<span class="token operator">&lt;</span><span class="token operator">/</span>plugin<span class="token operator">&gt;</span>
	<span class="token operator">&lt;</span><span class="token operator">/</span>plugins<span class="token operator">&gt;</span>
<span class="token operator">&lt;</span><span class="token operator">/</span>build<span class="token operator">&gt;</span>

</project>

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2.2.3 Mavenjar包作用范围

1.test范围是指测试范围有效,在编译和打包时都不会使用这个依赖
2.compile范围是指编译范围内有效,在编译和打包时都会将依赖存储进去
3.provided依赖,在编译和测试过程中有效,最后生成的war包时不会加入 例如:
servlet-api,因为servlet-api tomcat服务器已经存在了,如果再打包会冲突
4.runtime在运行时候依赖,在编译时候不依赖
默认依赖范围是compile

2.2.4 数据源配置

#SpringBoot 开箱即用
spring:
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/jtadmin?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf8&autoReconnect=true&allowMultiQueries=true
    username: root
    password: root

 
 
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关于参数说明:
1.serverTimezone=GMT%2B8 %2B “+” 号 新版本的驱动要求必须配置时区
2.&useUnicode=true&characterEncoding=utf8 使用Unicode编码 要求字符UTF-8编码
3.&autoReconnect=true 是否自动重连.
4.&allowMultiQueries=true 是否允许批量操作 同时执行多个sql!

2.2.5 Mybatis相关配置

#SpringBoot整合Mybatis配置
mybatis:
  #定义别名包
  type-aliases-package: com.jt.pojo
  mapper-locations: classpath:/mybatis/mappers/*.xml
  #开启驼峰映射
  configuration:
    map-underscore-to-camel-case: true

 
 
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2.2.6 编辑Mapper接口/映射文件

2.2.7 将Mapper接口交给容器管理

2.2.8 Mybatis测试

编辑测试类,注意包路径的写法.

@SpringBootTest
public class TestSpringBoot {
<span class="token annotation punctuation">@Autowired</span>
<span class="token keyword">private</span> DemoUserMapper userMapper<span class="token punctuation">;</span>

<span class="token annotation punctuation">@Test</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">testFindAll</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{<!-- --></span>

    System<span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>userMapper<span class="token punctuation">.</span><span class="token function">findAll</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

}

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2.3 关于绑定异常

2.3.1 报错说明

绑定异常: mapper的接口与xml的映射文件之间绑定异常.

	org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.jt.mapper.DemoUserMapper.findAll

 
 
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代码排查:
1).检查Mapper接口的路径

2).检查mapper.xml引入过程

3).检查mapper.xml映射文件

4).检查方法名称
检查mapper接口方法名称,与标签的ID是否一致.

5). 清空/重新编译项目
1).clean项目

2).build项目

6).将我的代码全部复制 测试一下. 只粘贴pom.xml 和src文件.

7).检查目录层级,是否使用/进行分割.

2.3.2 关于数据库密码问题

默认的数据库密码 root/root
创建数据库密码时 以数字0开头 012345
问题解释: 数据密码在进行编译时. 如果遇到首字母为0则自动删除.
解决方案: 如果以特殊数字开头 则 “012345” 引号包裹

2.4 关于Mapper接口代理对象创建流程

说明: 当springBoot启动时,加载pom.xml文件.实例化对象的流程图.

2.5 Mybatis入库练习

2.5.1 编辑Mapper接口

2.5.2 编辑Mapper.xml 文件

<!--
		完成用户入库操作 id="与方法名称保持一致"
		sql结束时不需要添加;号 在Mysql数据库中执行;号没有问题,
		但是如果在Oracle中执行则必然报错.
	-->
	<insert id="insertUser">
		insert into demo_user(id,name,age,sex)
			values(null,#{name},#{age},#{sex})
	</insert>

 
 
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2.5.3 业务调用

 	//新增用户
    @Test
    public void testInsert(){
        DemoUser user = new DemoUser();
        user.setId(null).setName("mybatis信息").setAge(18).setSex("男");
        userMapper.insertUser(user);
    }

 
 
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2.6 Mybatis更新练习

2.6.1 Mapper接口

2.6.2 编辑Mapper.xml映射文件

在mapper.xml文件中 实现更新操作

2.6.3 编辑测试类

标签：gt,Springboot,spring,boot,lt,mybatis,artifactId,groupId,搭建
来源： https://blog.csdn.net/yanguicehn/article/details/116257404