Back-end lecturer management module
The structure of the back-end project
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Module description
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Provide unified management of packaging methods and versions
Add the pom type after the node
pom
Delete the content in pom.xml
<!-- 以下内容删除 --> <dependencies>
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency>
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies>
Treat unused dependencies
Comments should be made temporarily, otherwise an error will be reported during runtime
MP code generator
The first step is to import dependencies
The second step is to write the code
Need to change
String projectPath = System.getProperty("user.dir");//相对路径可能会出现问题
gc.setOutputDir("D:\\JAVA---SpringBoot分布式项目实战\\guli_parent\\service\\service_edu" + "/src/main/java");
gc.setIdType(IdType.ID_WORKER_STR); //主键策略，判断类型
dsc.setUrl("jdbc:mysql://localhost:3306/guli?serverTimezone=GMT%2B8");
dsc.setPassword("123456");
pc.setModuleName("eduservice"); //模块名
//包 com.atguigu.eduservice
pc.setParent("com.atguigu");
strategy.setInclude("edu_teacher");//指定表
Simple crud MP has been automatically implemented in mapper and service
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Scan the mapper
Mapper is an interface, there is no implementation class, it is handed over to spring for management and assembly
method one
Put it on the startup class
Method Two
Put it on the mapper interface
Method Three
Put in the configuration class
/Add or not
It's the same if you add it or not here
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Must be added at the beginning of this
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Time display problem
"gmtCreate":"2019-10-30T06:18:46.000+0000"
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AthPathVariable
@DeleteMapping("{id}")
public R removeTeacher(@ApiParam(name = "id", value = "讲师ID", required = true)
@PathVariable String id) {
Receive the parameters passed in the path
Integrate swagger
first step
Import dependencies
Second step
Write configuration class
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References between different modules
first step
Reference in pom
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Second step
Configure package scanning rules (Springboot only scans all packages under this category by default)
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Unified result return (Json)
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Introduced when used, the same as references between different modules
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Conditional query pagination
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RequestBody
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Among them, requirede=false, indicating that you can enter without passing a value
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Solve the problem that the database cannot be found in Chinese
Configure in the configuration file
spring.datasource.url=jdbc:mysql://localhost:3306/guli?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf8
Conditional query and auto-fill
One is the attribute name fieldname
One is the field column in the table
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Add lecturer
id is automatically created using snowflake algorithm (no need to add)
gmtCreater
gmtModified uses auto-fill (no need to add)
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Modify lecturer
When experimenting, each must have an initial value
method one
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Method Two
The id must be included in the json when modifying
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Unified exception handling
Use: add a class and an annotation
Which uses the unified result return, the introduction is the same as above
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Solve the problem of introducing duplication
Prevent the introduction of duplication
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Dependency pass
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