mybatis-generator

mybatis-generator

1、添加依賴

<!--mybatis生成器-->
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.7</version>
        </dependency>

2、配置文件

1. generator.properties

jdbc.driverClass=com.mysql.cj.jdbc.Driver
jdbc.connectionURL=jdbc:mysql://localhost:3306/mall?zeroDateTimeBehavior=convertToNull&useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC&autoReconnect=true
jdbc.userId=root
jdbc.password=root

1. 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>
    <properties resource="generator.properties"/>
    <context id="MySqlContext" targetRuntime="MyBatis3" defaultModelType="flat">
        <property name="beginningDelimiter" value="`"/>
        <property name="endingDelimiter" value="`"/>
        <property name="javaFileEncoding" value="UTF-8"/>
        <!-- 爲模型生成序列化方法-->
        <plugin type="org.mybatis.generator.plugins.SerializablePlugin"/>
        <!-- 爲生成的Java模型建立一個toString方法 -->
        <plugin type="org.mybatis.generator.plugins.ToStringPlugin"/>
        <!--生成mapper.xml時覆蓋原文件-->
        <plugin type="org.mybatis.generator.plugins.UnmergeableXmlMappersPlugin" />
        <commentGenerator type="top.xtslife.mall.mbg.CommonGenerator">
            <!-- 是否去除自動生成的註釋 true：是 ： false:否 -->
            <property name="suppressAllComments" value="true"/>
            <property name="suppressDate" value="true"/>
            <property name="addRemarkComments" value="true"/>
        </commentGenerator>

        <jdbcConnection driverClass="${jdbc.driverClass}"
                        connectionURL="${jdbc.connectionURL}"
                        userId="${jdbc.userId}"
                        password="${jdbc.password}">
            <!--解決mysql驅動升級到8.0後不生成指定數據庫代碼的問題-->
            <property name="nullCatalogMeansCurrent" value="true" />
        </jdbcConnection>
        <!--生成pojo-->
        <javaModelGenerator targetPackage="top.xtslife.mall.mbg.model" targetProject="src\main\java"/>
        <!--生成xml文件-->
        <sqlMapGenerator targetPackage="top.xtslife.mall.mbg.mapper" targetProject="src\main\resources"/>
        <!--生成mapper接口-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="top.xtslife.mall.mbg.mapper"
                             targetProject="src\main\java"/>
        <!--生成所有表tableName設爲%-->
        <table tableName="%">
            <generatedKey column="id" sqlStatement="MySql" identity="true"/>
        </table>
    </context>
</generatorConfiguration>

3、生成代碼

• Generator

package top.xtslife.mall.mbg;

import org.mybatis.generator.api.MyBatisGenerator;
import org.mybatis.generator.config.Configuration;
import org.mybatis.generator.config.xml.ConfigurationParser;
import org.mybatis.generator.internal.DefaultShellCallback;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

/**
 * @Author 小濤
 * @Create 2019-08-09  10:09
 */
public class Generator {
    public static void main(String[] args) throws Exception {
        //MBG 執行過程當中的警告信息
        List<String> warnings = new ArrayList<String>();
        //當生成的代碼重複時，覆蓋原代碼
        boolean overwrite = true;
        //讀取咱們的 MBG 配置文件
        InputStream is = Generator.class.getResourceAsStream("/generatorConfig.xml");
        ConfigurationParser cp = new ConfigurationParser(warnings);
        Configuration config = cp.parseConfiguration(is);
        is.close();

        DefaultShellCallback callback = new DefaultShellCallback(overwrite);
        //建立 MBG
        MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
        //執行生成代碼
        myBatisGenerator.generate(null);
        //輸出警告信息
        for (String warning : warnings) {
            System.out.println(warning);
        }
    }
}

• CommonGenerator

package top.xtslife.mall.mbg;

import org.mybatis.generator.api.IntrospectedColumn;
import org.mybatis.generator.api.IntrospectedTable;
import org.mybatis.generator.api.dom.java.CompilationUnit;
import org.mybatis.generator.api.dom.java.Field;
import org.mybatis.generator.api.dom.java.FullyQualifiedJavaType;
import org.mybatis.generator.internal.DefaultCommentGenerator;
import org.mybatis.generator.internal.util.StringUtility;

import java.util.Properties;

/**
 * @Author 小濤
 * @Create 2019-08-09  10:10
 */
public class CommonGenerator extends DefaultCommentGenerator {
    private boolean addRemarkComments = false;
    private static final String EXAMPLE_SUFFIX="Example";
    private static final String API_MODEL_PROPERTY_FULL_CLASS_NAME="io.swagger.annotations.ApiModelProperty";

    /**
     * 設置用戶配置的參數
     */
    @Override
    public void addConfigurationProperties(Properties properties) {
        super.addConfigurationProperties(properties);
        this.addRemarkComments = StringUtility.isTrue(properties.getProperty("addRemarkComments"));
    }

    /**
     * 給字段添加註釋
     */
    @Override
    public void addFieldComment(Field field, IntrospectedTable introspectedTable,
                                IntrospectedColumn introspectedColumn) {
        String remarks = introspectedColumn.getRemarks();
        //根據參數和備註信息判斷是否添加備註信息
        if(addRemarkComments&&StringUtility.stringHasValue(remarks)){
//            addFieldJavaDoc(field, remarks);
            //數據庫中特殊字符須要轉義
            if(remarks.contains("\"")){
                remarks = remarks.replace("\"","'");
            }
            //給model的字段添加swagger註解
            field.addJavaDocLine("@ApiModelProperty(value = \""+remarks+"\")");
        }
    }

    /**
     * 給model的字段添加註釋
     */
    private void addFieldJavaDoc(Field field, String remarks) {
        //文檔註釋開始
        field.addJavaDocLine("/**");
        //獲取數據庫字段的備註信息
        String[] remarkLines = remarks.split(System.getProperty("line.separator"));
        for(String remarkLine:remarkLines){
            field.addJavaDocLine(" * "+remarkLine);
        }
        addJavadocTag(field, false);
        field.addJavaDocLine(" */");
    }

    @Override
    public void addJavaFileComment(CompilationUnit compilationUnit) {
        super.addJavaFileComment(compilationUnit);
        //只在model中添加swagger註解類的導入
        if(!compilationUnit.isJavaInterface()&&!compilationUnit.getType().getFullyQualifiedName().contains(EXAMPLE_SUFFIX)){
            compilationUnit.addImportedType(new FullyQualifiedJavaType(API_MODEL_PROPERTY_FULL_CLASS_NAME));
        }
    }
}