01-代码生成器核心逻辑

image-20220305215234413

参考资料 mybatis-plus: https://baomidou.com/

参考资料 freemarker: http://freemarker.foofun.cn/

1. 核心是2条SQL

  • 查询当前数据库中所有表的表信息
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select * from information_schema.TABLES where TABLE_SCHEMA=(select database())
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{
	TABLE_CATALOG=def,
	TABLE_COMMENT=,   //表注释
	TABLE_NAME=...,   //表名
	TABLE_SCHEMA=..., //数据库名
	ENGINE=InnoDB,
	TABLE_TYPE=BASETABLE,
	TABLE_ROWS=...,
	AVG_ROW_LENGTH=...,
	DATA_LENGTH=...,
	DATA_FREE=0,
	INDEX_LENGTH=0,
	ROW_FORMAT=Dynamic,
	VERSION=10,
	CREATE_OPTIONS=,
	CREATE_TIME=2022-02-22T18: 54: 40,
	MAX_DATA_LENGTH=0,
	TABLE_COLLATION=utf8mb4_general_ci
},
{...}
  • 查询具体表名的所有字段的字段信息(order by的作用确保主键在第一个元素)
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select * from information_schema.COLUMNS where TABLE_SCHEMA = (select database()) and TABLE_NAME='表名' order by ORDINAL_POSITION
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{
	TABLE_CATALOG=def,
	IS_NULLABLE=NO,
	TABLE_NAME=...,     //表名
	TABLE_SCHEMA=...,   //数据库名
	EXTRA=,
	COLUMN_NAME=...,    //字段名
	COLUMN_KEY=PRI,
	CHARACTER_OCTET_LENGTH=80,
	PRIVILEGES=select,insert,update,references,
	COLUMN_COMMENT=..., //字段注释
	COLLATION_NAME=utf8mb4_general_ci,
	COLUMN_TYPE=varchar(20),
	GENERATION_EXPRESSION=,
	ORDINAL_POSITION=1,
	CHARACTER_MAXIMUM_LENGTH=...,
	DATA_TYPE=varchar,
	CHARACTER_SET_NAME=utf8mb4
},
{...}

2. 读取表和字段Demo

2.1 Demo

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pom.xml

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      <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>
      <!-- mybatis-plus -->
      <dependency>
          <groupId>com.baomidou</groupId>
          <artifactId>mybatis-plus-boot-starter</artifactId>
          <version>3.5.1</version>
      </dependency>
      <!-- mysql -->
      <dependency>
          <groupId>mysql</groupId>
          <artifactId>mysql-connector-java</artifactId>
      </dependency>
<!-- druid -->
      <dependency>
          <groupId>com.alibaba</groupId>
          <artifactId>druid</artifactId>
          <version>1.1.22</version>
      </dependency>
<!-- lombok -->
      <dependency>
          <groupId>org.projectlombok</groupId>
          <artifactId>lombok</artifactId>
          <version>1.18.12</version>
      </dependency>

application.yml

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spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource
    url: jdbc:mysql://localhost:3306/mydata?serverTimezone=Asia/Shanghai
    username: root
    password: 123456

ReadtableApplication.java

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import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class ReadtableApplication {
    public static void main(String[] args) {
        SpringApplication.run(ReadtableApplication.class, args);
    }
}

TableDao.java

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import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
import java.util.List;
import java.util.Map;

@Mapper
public interface TableDao {

    @Select("select * from information_schema.TABLES where TABLE_SCHEMA=(select database())")
    List<Map<String, String>> listTable();

    @Select("select * from information_schema.COLUMNS where TABLE_SCHEMA = (select database()) and TABLE_NAME=#{tableName} order by ORDINAL_POSITION")
    List<Map<String, String>> listTableColumn(String tableName);
}

Column.java

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import lombok.Data;

/**
 * 字段
 */
@Data
public class Column {
    private String fieldID;             //null
    private String isPk;                //COLUMN_KEY=PRI, 主键
    private String hbaseFieldName;      //null
    private String fieldName;           //COLUMN_NAME
    private String dataType;            //DATA_TYPE
    private String isNull;              //IS_NULLABLE=NO,值n; IS_NULLABLE=YES,值y
    private String description;         //COLUMN_COMMENT
    private String fieldLength;         //COLUMN_TYPE=类型(20),值20
    private String fieldInput;          //null
    private String internationalKey;    //null
    private String internationalValue;  //null
}

Table.java

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import lombok.Data;
import java.util.List;

/**
 * 表
 */
@Data
public class Table {
    private String tableEn;         //TABLE_NAME
    private String tableCn;         //TABLE_COMMENT
    private List<Column> columns;   //表内的字段
}

ReadtableApplicationTests.java

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import com.jerry.readtable.model.Column;
import com.jerry.readtable.model.Table;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.util.CollectionUtils;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;

/**
 * 通过Mybatis-Plus读取数据库表结构和字段
 * @author Jerry(姜源)
 * @date 2022-03-01 23:24
 */
@SpringBootTest
class ReadtableApplicationTests {

    @Autowired
    private TableDao tableDao;

    @Test
    void testTableDao() {
        //数据表列表
        List<Map<String, String>> tables = tableDao.listTable();
        System.out.println("tables = " + tables);

        List<Table> tableList = new LinkedList<>();
        //数据表结构
        if (!CollectionUtils.isEmpty(tables)) {
            //遍历表
            for (Map<String, String> table : tables) {
                Table t = new Table();
                t.setTableEn(table.get("TABLE_NAME"));
                t.setTableCn(table.get("TABLE_COMMENT"));

                List<Map<String, String>> tableColumns = tableDao.listTableColumn(t.getTableEn());
                System.out.println("tableColumns = " + tableColumns);

                List<Column> columnList = new LinkedList<>();
                //遍历表中的字段
                for (Map<String, String> tableColumn : tableColumns) {
                    Column column = new Column();
                    column.setFieldID(null);
                    column.setIsPk("PRI".equals(tableColumn.get("COLUMN_KEY")) ? "y" : "n");
                    column.setHbaseFieldName(null);
                    column.setFieldName(tableColumn.get("COLUMN_NAME"));
                    //兼容text或longtext类型也标记entity与varchar的类型一样，都是char类型，entity中会写入为String
                    String dataType = tableColumn.get("DATA_TYPE");
                    column.setDataType("text".equals(dataType) || "longtext".equals(dataType) ? "char" : dataType);
                    column.setIsNull("NO".equals(tableColumn.get("IS_NULLABLE")) ? "n" : "y");
                    column.setDescription(tableColumn.get("COLUMN_COMMENT"));
                    column.setFieldLength(extDigit(tableColumn.get("COLUMN_TYPE")));
                    column.setFieldInput(null);
                    column.setInternationalKey(null);
                    column.setInternationalValue(null);
                    columnList.add(column);
                }
                t.setColumns(columnList);
                tableList.add(t);
            }
        }
        System.out.println("result = " + tableList);
    }

    /**
     * 提取数字
     */
    public static String extDigit(String source) {
        String regEx = "[^0-9]";
        return Pattern.compile(regEx).matcher(source).replaceAll("").trim();
    }
}

2.2 运行结果

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2022-03-05 21:14:37.390  INFO 6900 --- [           main] com.alibaba.druid.pool.DruidDataSource   : {dataSource-1} inited
#score, student
tables = [{TABLE_CATALOG=def, TABLE_COMMENT=, TABLE_NAME=score, TABLE_SCHEMA=mydata, ENGINE=InnoDB, TABLE_TYPE=BASE TABLE, TABLE_ROWS=18, AVG_ROW_LENGTH=910, DATA_LENGTH=16384, DATA_FREE=0, INDEX_LENGTH=0, ROW_FORMAT=Dynamic, VERSION=10, CREATE_OPTIONS=, CREATE_TIME=2022-02-22T18:54:40, MAX_DATA_LENGTH=0, TABLE_COLLATION=utf8mb4_general_ci}, {TABLE_CATALOG=def, TABLE_COMMENT=, TABLE_NAME=student, TABLE_SCHEMA=mydata, ENGINE=InnoDB, TABLE_TYPE=BASE TABLE, TABLE_ROWS=8, AVG_ROW_LENGTH=2048, DATA_LENGTH=16384, DATA_FREE=0, INDEX_LENGTH=0, ROW_FORMAT=Dynamic, VERSION=10, CREATE_OPTIONS=, CREATE_TIME=2022-02-22T18:46:32, MAX_DATA_LENGTH=0, TABLE_COLLATION=utf8mb4_general_ci}]
#score字段
tableColumns = [{TABLE_CATALOG=def, IS_NULLABLE=NO, TABLE_NAME=score, TABLE_SCHEMA=mydata, EXTRA=, COLUMN_NAME=s_id, COLUMN_KEY=PRI, CHARACTER_OCTET_LENGTH=80, PRIVILEGES=select,insert,update,references, COLUMN_COMMENT=成绩id, COLLATION_NAME=utf8mb4_general_ci, COLUMN_TYPE=varchar(20), GENERATION_EXPRESSION=, ORDINAL_POSITION=1, CHARACTER_MAXIMUM_LENGTH=20, DATA_TYPE=varchar, CHARACTER_SET_NAME=utf8mb4}, {TABLE_CATALOG=def, IS_NULLABLE=NO, TABLE_NAME=score, TABLE_SCHEMA=mydata, EXTRA=, COLUMN_NAME=c_id, COLUMN_KEY=PRI, CHARACTER_OCTET_LENGTH=80, PRIVILEGES=select,insert,update,references, COLUMN_COMMENT=课程id, COLLATION_NAME=utf8mb4_general_ci, COLUMN_TYPE=varchar(20), GENERATION_EXPRESSION=, ORDINAL_POSITION=2, CHARACTER_MAXIMUM_LENGTH=20, DATA_TYPE=varchar, CHARACTER_SET_NAME=utf8mb4}, {TABLE_CATALOG=def, IS_NULLABLE=YES, TABLE_NAME=score, TABLE_SCHEMA=mydata, EXTRA=, COLUMN_NAME=s_score, COLUMN_KEY=, NUMERIC_PRECISION=10, PRIVILEGES=select,insert,update,references, COLUMN_COMMENT=成绩分数, NUMERIC_SCALE=0, COLUMN_TYPE=int(3), GENERATION_EXPRESSION=, ORDINAL_POSITION=3, DATA_TYPE=int}]
#student字段
tableColumns = [{TABLE_CATALOG=def, IS_NULLABLE=NO, TABLE_NAME=student, TABLE_SCHEMA=mydata, EXTRA=, COLUMN_NAME=s_id, COLUMN_KEY=PRI, CHARACTER_OCTET_LENGTH=80, PRIVILEGES=select,insert,update,references, COLUMN_COMMENT=学生id, COLLATION_NAME=utf8mb4_general_ci, COLUMN_TYPE=varchar(20), GENERATION_EXPRESSION=, ORDINAL_POSITION=1, CHARACTER_MAXIMUM_LENGTH=20, DATA_TYPE=varchar, CHARACTER_SET_NAME=utf8mb4}, {TABLE_CATALOG=def, IS_NULLABLE=YES, TABLE_NAME=student, TABLE_SCHEMA=mydata, EXTRA=, COLUMN_NAME=s_name, COLUMN_KEY=, CHARACTER_OCTET_LENGTH=80, PRIVILEGES=select,insert,update,references, COLUMN_COMMENT=学生姓名, COLLATION_NAME=utf8mb4_general_ci, COLUMN_TYPE=varchar(20), GENERATION_EXPRESSION=, ORDINAL_POSITION=2, CHARACTER_MAXIMUM_LENGTH=20, DATA_TYPE=varchar, CHARACTER_SET_NAME=utf8mb4}, {TABLE_CATALOG=def, IS_NULLABLE=YES, TABLE_NAME=student, TABLE_SCHEMA=mydata, EXTRA=, COLUMN_NAME=s_birth, COLUMN_KEY=, CHARACTER_OCTET_LENGTH=80, PRIVILEGES=select,insert,update,references, COLUMN_COMMENT=学生生日, COLLATION_NAME=utf8mb4_general_ci, COLUMN_TYPE=varchar(20), GENERATION_EXPRESSION=, ORDINAL_POSITION=3, CHARACTER_MAXIMUM_LENGTH=20, DATA_TYPE=varchar, CHARACTER_SET_NAME=utf8mb4}, {TABLE_CATALOG=def, IS_NULLABLE=YES, TABLE_NAME=student, TABLE_SCHEMA=mydata, EXTRA=, COLUMN_NAME=s_sex, COLUMN_KEY=, CHARACTER_OCTET_LENGTH=40, PRIVILEGES=select,insert,update,references, COLUMN_COMMENT=学生性别, COLLATION_NAME=utf8mb4_general_ci, COLUMN_TYPE=varchar(10), GENERATION_EXPRESSION=, ORDINAL_POSITION=4, CHARACTER_MAXIMUM_LENGTH=10, DATA_TYPE=varchar, CHARACTER_SET_NAME=utf8mb4}]

3. 模板文件生成代码

方案: freemarker

3.0 application.yml

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#新增数据库连接配置
spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/xxx?serverTimezone=Asia/Shanghai
    username: root
    password: 123456
#自定义配置
path:
  template: F:\\code\\generate\\generate-server-code\\src\\main\\resources\\templates
  target: F:\\target
name:
  project: test-gen-server
  module: cn.test.generate
  tablePrefix: tt_
  author: Jerry

3.1 java文件

参考示例1：serviceImpl.ftl

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package ${moduleName}.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import cn.hutool.core.bean.BeanUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.transaction.annotation.Transactional;

import ${moduleName}.api.dto.${entityName}DTO;
import ${moduleName}.api.entity.${entityName};
import ${moduleName}.dao.${entityName}Dao;
import ${moduleName}.service.${entityName}Service;

/**
 * <p>Description:${tableCn}Service实现</p>
 * <p>Copyright: Copyright (c)${year}</p>
 * <p>Author: ${authorName}</p>
 * <P>Created Date :${date}</P>
 * @version 1.0
 */
@Component
@Transactional
public class ${entityName}ServiceImpl extends ServiceImpl<${entityName}Dao, ${entityName}> implements ${entityName}Service {
    
    @Autowired
    private ${entityName}Dao ${entityNameFirstLower}Dao;

    /**
     * 分页查询
     * @create: ${currentTime}
     * @author: ${authorName}
     * @throws Exception
     */
    @Override
    public Page<${entityName}> list(IQuery<${entityName}DTO> query) {
        QueryWrapper<${entityName}> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("isValid", 1);
        ${entityName}DTO dto = query.getDto();
        IQuery.sortHandle(query, queryWrapper);

        Page<${entityName}> page = new Page<>(query.getPageNo(), query.getPageSize());
        Page<${entityName}> ${entityNameFirstLower}Page = ${entityNameFirstLower}Dao.selectPage(page, queryWrapper);

        return ${entityNameFirstLower}Page;
    }

    /**
    * 根据主键获取
    * @create: ${currentTime}
    * @author: ${authorName}
    * @throws Exception
    */
    @Override
    public ${entityName} getBy${pkFirstUpper}(Long ${pk}){
        return this.getById(${pk});
    }

    <#if isUser == 1>
    /**
    * 根据用户id获取
    * @create: ${currentTime}
    * @author: ${authorName}
    * @throws Exception
    */
    @Override
    public ${entityName} getByUserId(Long userId){
        QueryWrapper<${entityName}> wrapper = new QueryWrapper<>();
        wrapper.lambda().eq(${entityName}::getIsValid,1)
            .eq(BeanUtil.isNotEmpty(userId),${entityName}::getUserId,userId)
            .last("limit 1");

        ${entityName} ${entityNameFirstLower} = ${entityNameFirstLower}Dao.selectOne(wrapper);
        return ${entityNameFirstLower};
    }
    </#if>
    /**
    * 新增
    * @create: ${currentTime}
    * @author: ${authorName}
    * @throws Exception
    */
    @Override
    public void insert(${entityName} ${entityNameFirstLower}){
        this.save(${entityNameFirstLower});
    }

    /**
    * 修改
    * @create: ${currentTime}
    * @author: ${authorName}
    * @throws Exception
    */
    @Override
    public void update(${entityName} ${entityNameFirstLower}){
        this.updateById(${entityNameFirstLower});
    }
}

生成方法：

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//调用
GeneratorServiceImpl.buildServiceImpl(targetPath, projectName, moduleName, templatePathFile, tableList, authorName);
//类和方法
@SuppressWarnings("all")
public class GeneratorServiceImpl {
    /**
     * 生成Service
     *
     * @param targetPath   目标路径
     * @param projectName  项目名称
     * @param moduleName   模块名称
     * @param templatePath 模板路径
     * @param tableList    表结构字段列表
     * @return void
     * @throws
     * @author Jerry(姜源)
     * @date 2022-03-02 11:26
     */
    public static void buildServiceImpl(String targetPath, String projectName, String moduleName, File templatePath, List<Table> tableList, String authorName) {
        String entityPath = targetPath + "/" + projectName + "/" + projectName + "-admin" + "/src/main/java/" + StringUtils.replace(moduleName, ".", "/") + "/service/impl/";

        File file = new File(entityPath);
        file.mkdirs();

        for (Table table : tableList) {
            try {
                Configuration freemarkerCfg = new Configuration();
                freemarkerCfg.setDirectoryForTemplateLoading(templatePath);
                freemarkerCfg.setEncoding(Locale.getDefault(), "UTF-8");
                Template template;

                String templateFile = "/serviceImpl.ftl";//模板文件 resources/templates/serviceImpl.ftl

                String entityName = "";
                String tableEn = table.getTableEn();

                String[] tableEns = tableEn.split("_");
                for (Integer index = 1; index < tableEns.length; index++) {
                    entityName = entityName + StringUtils.capitalize(tableEns[index]);
                }
                String targetFileName = entityPath + entityName + "ServiceImpl.java";//生成文件完整路径及文件名

                Map<String, Object> dataMap = new HashMap();

                List<Field> fieldList = table.getFieldList();
                dataMap.put("fieldList", EntityUtil.getEntity(fieldList));

                DateTime dateTime = new DateTime();
                dataMap.put("year", dateTime.getYear());
                dataMap.put("date", dateTime.toString("yyyy年MM月dd日"));
                dataMap.put("currentTime", new DateTime().toString("yyyy年MM月dd日 mm:ss"));

                dataMap.put("moduleName", moduleName);
                dataMap.put("applicationName", StringUtils.capitalize(StringUtils.substringAfterLast(moduleName, ".")));
                dataMap.put("packageName", StringUtils.substringBeforeLast(moduleName, "."));
                dataMap.put("basePackage", StringUtils.substringBeforeLast(StringUtils.substringBeforeLast(moduleName, "."), "."));

                dataMap.put("entityName", entityName);
                dataMap.put("entityNameFirstLower", StringUtils.uncapitalize(entityName));
                dataMap.put("tableCn", table.getTableCn());

                Field field = fieldList.stream().filter(f -> 1 == f.getIsPk()).findFirst().orElse(null);
                dataMap.put("pk", field.getFieldName());
                dataMap.put("pkFirstUpper", StringUtils.capitalize(field.getFieldName()));

                dataMap.put("authorName", authorName);

                template = freemarkerCfg.getTemplate(templateFile);
                template.setEncoding("UTF-8");
                File targetFile = new File(targetFileName);
                Writer out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(targetFile), "UTF-8"));
                template.process(dataMap, out);
                out.flush();
                out.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

3.2 xml文件

参考示例2：mapper.ftl - 生成方法同 3.1

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<?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">
<!-- namespace必须指向Dao接口 -->
<mapper namespace="${moduleName}.dao.${entityName}Dao">
    <!-- < 小于号 -->
    <sql id="LESS_THAN_SYMBOL">
        <![CDATA[
        <
        ]]>
    </sql>

    <!-- & 按位与 -->
    <sql id="COLLATION_OPERATION">
        <![CDATA[
        &
        ]]>
    </sql>

    <resultMap id="BaseResultMap" type="${moduleName}.api.entity.${entityName}">
        <!--@Table ${entityName}-->
    <#list fieldList as field>
        <result column="${field.fieldName}" property="${field.fieldName}"/>
    </#list>
    </resultMap>

    <sql id="Base_Column_List">
<#list fieldList as field>
    <#if field_has_next == true>
        ${field.fieldName},
    <#else>
        ${field.fieldName}
    </#if>
</#list>
    </sql>
</mapper>

3.3 yml文件

参考示例3：bootstrap.ftl - 生成方法同 3.1

使最终生成是显示为 ${aaa} 的样式，则需要进行特殊处理为：

${r'${aaa}'}

否则会因为通过表达式 ${aaa} 找 aaa 变量找不到而报错。

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server:
  port: 8081

spring:
  profiles:
    active: dev
  application:
    name: ${projectName}
  cloud:
    nacos:
      config:
        server-addr: http://${r'${spring.profiles.active}'}-xxx-nacos.xxx.com
        file-extension: yaml
        encode: utf-8
        group: DEFAULT_GROUP
        # dev 命名空间
        namespace: xxx
        # test 命名空间
        #namespace: xxx
        extension-configs:
          # 服务发现配置
          - data-id: xxx-config-discovery-${r'${spring.profiles.active}'}.${r'${spring.cloud.nacos.config.file-extension}'}
            refresh: true
            group: common
          # 基础配置文件
          - data-id: xxx-common-${r'${spring.profiles.active}'}.${r'${spring.cloud.nacos.config.file-extension}'}
            refresh: true
            group: xxx
          # 数据配置文件
          - data-id: xxx-db-${r'${spring.profiles.active}'}.${r'${spring.cloud.nacos.config.file-extension}'}
            refresh: true
            group: xxx
15_分布式 > 02_代码生成器
#架构
01-代码生成器核心逻辑
https://janycode.github.io/2022/03/05/15_分布式/02_代码生成器/01-代码生成器核心逻辑/
作者
Jerry(姜源)
发布于
2022年3月5日
许可协议