SpringBoot-Mybatis Generator 代碼自動生成

我使用的環境配置

IDEA	2019.2
Spring Boot	2.2.1.RELEASE
Generator	1.3.7

代碼地址： https://gitee.com/shanjava/springbootlearning.git；

POM 添加依賴：

 <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.7</version>
                <configuration>
                    <configurationFile>src/main/resources/generatorConfig.xml</configurationFile>
                    <overwrite>true</overwrite>
                    <verbose>true</verbose>
                </configuration>
                
            </plugin>

項目配置文件 application.yml：

#update port :8010
server:
  port: 8010

spring:
  #config mysql datasource
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/mysql_tem?useUnicode=true&characterEncoding=utf8
    username: mysql_root
    password: mysql_pass
    driver-class-name: com.mysql.cj.jdbc.Driver

#mybatis config
mybatis:
  mapper-locations: classpath:mapping/*.xml

#pagehelper分頁插件
pagehelper:
  #分頁插件會自動檢測當前的數據庫鏈接，自動選擇合適的分頁方式
  helperDialect: mysql
  #    分頁合理化參數，默認值爲false。當該參數設置爲 true 時，pageNum<=0 時會查詢第一頁， pageNum>pages（超過總數時），會查詢最後一頁。默認false 時，直接根據參數進行查詢。
  reasonable: true
  #    支持通過 Mapper 接口參數來傳遞分頁參數，默認值false，分頁插件會從查詢方法的參數值中，自動根據上面 params 配置的字段中取值，查找到合適的值時就會自動分頁。
  supportMethodsArguments: true
  params: count=countSql

在  resource目錄下添加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>
    <!-- 數據庫驅動:選擇你的本地硬盤上面的數據庫驅動包-->


    <classPathEntry
            location="C:\Users\wangs\.m2\repository\mysql\mysql-connector-java\8.0.17\mysql-connector-java-8.0.17.jar"/>
    <context id="Mysql" targetRuntime="MyBatis3" defaultModelType="flat">
        <!-- 指定生成的java文件的編碼,沒有直接生成到項目時中文可能會亂碼 -->
        <property name="javaFileEncoding" value="UTF-8"/>
        <!-- 格式化java代碼 -->
        <property name="javaFormatter" value="org.mybatis.generator.api.dom.DefaultJavaFormatter"/>
        <!-- 格式化XML代碼 -->
        <property name="xmlFormatter" value="org.mybatis.generator.api.dom.DefaultXmlFormatter"/>
        <!-- beginningDelimiter和endingDelimiter：指明數據庫的用於標記數據庫對象名的符號，比如ORACLE就是雙引號，MYSQL默認是`反引號； -->
        <property name="beginningDelimiter" value="`"/>
        <property name="endingDelimiter" value="`"/>

        <plugin type="org.mybatis.generator.plugins.ToStringPlugin"/>
        <plugin type="org.mybatis.generator.plugins.SerializablePlugin"></plugin>
        <commentGenerator type="com.china.springbootmybatis.config.MyCommentGenerator">
        </commentGenerator>

        <!--數據庫鏈接URL，用戶名、密碼 -->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://127.0.0.1:3306/mysql_tem?useUnicode=true;characterEncoding=utf8"
                        userId="mysql_root" password="mysql_pass">
            <!--            MySQL8.0+的驅動默認返回的是用戶具有權限的所有表的信息，如果只返回當先數據庫的表信息，需要配置nullCatalogMeansCurrent 參數。-->
            <property name="nullCatalogMeansCurrent" value="true"/>
            <!-- 針對mysql數據庫 -->
            <property name="useInformationSchema" value="true"></property>
            <!-- 針對oracle數據庫 -->
            <!--            <property name="remarksReporting" value="true"></property>-->
        </jdbcConnection>
        <!-- 默認false，把JDBC DECIMAL 和 NUMERIC 類型解析爲 Integer，爲 true時把JDBC DECIMAL 和
        NUMERIC 類型解析爲java.math.BigDecimal -->
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>
        <!-- 生成模型的包名和位置-->
        <javaModelGenerator targetPackage="com.china.springbootmybatis.model"
                            targetProject="C:\Users\wangs\IdeaProjects\SpringBootLearning\SpringBoot-Mybatis\src\main\java">
            <property name="enableSubPackages" value="true"/>
            <!-- 設置是否在getter方法中，對String類型字段調用trim()方法 -->
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
        <!-- 生成映射文件的包名和位置-->
        <sqlMapGenerator targetPackage="resources.mapping"
                         targetProject="C:\Users\wangs\IdeaProjects\SpringBootLearning\SpringBoot-Mybatis\src\main">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>
        <!-- 生成DAO的包名和位置-->
        <!-- 客戶端代碼，生成易於使用的針對Model對象和XML配置文件 的代碼
            type="ANNOTATEDMAPPER",生成Java Model 和基於註解的Mapper對象
            type="MIXEDMAPPER",生成基於註解的Java Model 和相應的Mapper對象
            type="XMLMAPPER",生成SQLMap XML文件和獨立的Mapper接口
    -->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.china.springbootmybatis.mapper"
                             targetProject="C:\Users\wangs\IdeaProjects\SpringBootLearning\SpringBoot-Mybatis\src\main\java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>

        <table tableName="user" domainObjectName="User" enableCountByExample="false"
               enableUpdateByExample="false"
               enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false">
            <!--            生成實體類時是否使用實際的列名作爲實體類的屬性名-->
            <property name="useActualColumnNames" value="true"/>
            <generatedKey column="id" sqlStatement="JDBC" identity="true"/>
        </table>


        <!--9，enableDeleteByPrimaryKey（默認true）：指定是否生成按照主鍵刪除對象的語句（即delete）；-->
        <!--10，enableDeleteByExample（默認true）：MyBatis3Simple爲false，指定是否生成動態刪除語句；-->
        <!--11，enableCountByExample（默認true）：MyBatis3Simple爲false，指定是否生成動態查詢總條數語句（用於分頁的總條數查詢）；-->
        <!--12，enableUpdateByExample（默認true）：MyBatis3Simple爲false，指定是否生成動態修改語句（只修改對象中不爲空的屬性）；-->

    </context>
</generatorConfiguration>

現在可以在maven 中插件 啓動generator    會在相應的文件目錄生成文件

現在生成的model  中沒有中文註釋  很不友好   ，添加以下兩個類：

package com.china.springbootmybatis.config;

import static org.mybatis.generator.internal.util.StringUtility.isTrue;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Properties;
import java.util.Set;

import org.mybatis.generator.api.CommentGenerator;
import org.mybatis.generator.api.IntrospectedColumn;
import org.mybatis.generator.api.IntrospectedTable;
import org.mybatis.generator.api.dom.java.*;
import org.mybatis.generator.api.dom.xml.XmlElement;
import org.mybatis.generator.config.MergeConstants;
import org.mybatis.generator.config.PropertyRegistry;

/**
 * 描述：
 * @since 1.9.10
 * @version 1.9.10
 * @作者：niexiaohui
 * @創建時間：2016年11月22日
 * @修改記錄：
 */
public class MyCommentGenerator implements CommentGenerator{
    private Properties properties;
    private Properties systemPro;
    private boolean suppressDate;
    private boolean suppressAllComments;
    private String currentDateStr;

    public MyCommentGenerator() {
        super();
        properties = new Properties();
        systemPro = System.getProperties();
        suppressDate = false;
        suppressAllComments = false;
        currentDateStr = (new SimpleDateFormat("yyyy-MM-dd")).format(new Date());
    }

    @Override
    public void addJavaFileComment(CompilationUnit compilationUnit) {
        // add no file level comments by default
        return;
    }

    /**
     * Adds a suitable comment to warn users that the element was generated, and
     * when it was generated.
     */
    @Override
    public void addComment(XmlElement xmlElement) {
        return;
    }
    @Override
    public void addRootComment(XmlElement rootElement) {
        // add no document level comments by default
        return;
    }

    @Override
    public void addGeneralMethodAnnotation(Method method, IntrospectedTable introspectedTable, Set<FullyQualifiedJavaType> set) {

    }

    @Override
    public void addGeneralMethodAnnotation(Method method, IntrospectedTable introspectedTable, IntrospectedColumn introspectedColumn, Set<FullyQualifiedJavaType> set) {

    }

    @Override
    public void addFieldAnnotation(Field field, IntrospectedTable introspectedTable, Set<FullyQualifiedJavaType> set) {

    }

    @Override
    public void addFieldAnnotation(Field field, IntrospectedTable introspectedTable, IntrospectedColumn introspectedColumn, Set<FullyQualifiedJavaType> set) {

    }

    @Override
    public void addClassAnnotation(InnerClass innerClass, IntrospectedTable introspectedTable, Set<FullyQualifiedJavaType> set) {

    }

    @Override
    public void addConfigurationProperties(Properties properties) {
        this.properties.putAll(properties);

        suppressDate = isTrue(properties.getProperty(PropertyRegistry.COMMENT_GENERATOR_SUPPRESS_DATE));

        suppressAllComments = isTrue(properties.getProperty(PropertyRegistry.COMMENT_GENERATOR_SUPPRESS_ALL_COMMENTS));
    }

    /**
     * This method adds the custom javadoc tag for. You may do nothing if you do
     * not wish to include the Javadoc tag - however, if you do not include the
     * Javadoc tag then the Java merge capability of the eclipse plugin will
     * break.
     *
     * @param javaElement
     *            the java element
     */
    protected void addJavadocTag(JavaElement javaElement, boolean markAsDoNotDelete) {
        javaElement.addJavaDocLine(" *");
        StringBuilder sb = new StringBuilder();
        sb.append(" * ");
        sb.append(MergeConstants.NEW_ELEMENT_TAG);
        if (markAsDoNotDelete) {
            sb.append(" do_not_delete_during_merge");
        }
        String s = getDateString();
        if (s != null) {
            sb.append(' ');
            sb.append(s);
        }
        javaElement.addJavaDocLine(sb.toString());
    }

    /**
     * This method returns a formated date string to include in the Javadoc tag
     * and XML comments. You may return null if you do not want the date in
     * these documentation elements.
     *
     * @return a string representing the current timestamp, or null
     */
    protected String getDateString() {
        String result = null;
        if (!suppressDate) {
            result = currentDateStr;
        }
        return result;
    }
    @Override
    public void addClassComment(InnerClass innerClass, IntrospectedTable introspectedTable) {
        if (suppressAllComments) {
            return;
        }
        StringBuilder sb = new StringBuilder();
        innerClass.addJavaDocLine("/**");
        sb.append(" * ");
        sb.append(introspectedTable.getFullyQualifiedTable());
        sb.append(" ");
        sb.append(getDateString());
        innerClass.addJavaDocLine(sb.toString().replace("\n", " "));
        innerClass.addJavaDocLine(" */");
    }
    @Override
    public void addEnumComment(InnerEnum innerEnum, IntrospectedTable introspectedTable) {
        if (suppressAllComments) {
            return;
        }
        StringBuilder sb = new StringBuilder();
        innerEnum.addJavaDocLine("/**");
        sb.append(" * ");
        sb.append(introspectedTable.getFullyQualifiedTable());
        innerEnum.addJavaDocLine(sb.toString().replace("\n", " "));
        innerEnum.addJavaDocLine(" */");
    }
    @Override
    public void addFieldComment(Field field, IntrospectedTable introspectedTable,
                                IntrospectedColumn introspectedColumn) {
        if (suppressAllComments) {
            return;
        }
        StringBuilder sb = new StringBuilder();
        field.addJavaDocLine("/**");
        sb.append(" * ");
        sb.append(introspectedColumn.getRemarks());
        field.addJavaDocLine(sb.toString().replace("\n", " "));
        field.addJavaDocLine(" */");
    }
    @Override
    public void addFieldComment(Field field, IntrospectedTable introspectedTable) {
        if (suppressAllComments) {
            return;
        }
        StringBuilder sb = new StringBuilder();
        field.addJavaDocLine("/**");
        sb.append(" * ");
        sb.append(introspectedTable.getFullyQualifiedTable());
        field.addJavaDocLine(sb.toString().replace("\n", " "));
        field.addJavaDocLine(" */");
    }

    @Override
    public void addModelClassComment(TopLevelClass topLevelClass, IntrospectedTable introspectedTable) {

    }

    @Override
    public void addGeneralMethodComment(Method method, IntrospectedTable introspectedTable) {
        if (suppressAllComments) {
            return;
        }
        method.addJavaDocLine("/**");
        addJavadocTag(method, false);
        method.addJavaDocLine(" */");
    }
    @Override
    public void addGetterComment(Method method, IntrospectedTable introspectedTable,
                                 IntrospectedColumn introspectedColumn) {
        if (suppressAllComments) {
            return;
        }
        method.addJavaDocLine("/**");
        StringBuilder sb = new StringBuilder();
        sb.append(" * ");
        sb.append(introspectedColumn.getRemarks());
        method.addJavaDocLine(sb.toString().replace("\n", " "));
        sb.setLength(0);
        sb.append(" * @return ");
        sb.append(introspectedColumn.getActualColumnName());
        sb.append(" ");
        sb.append(introspectedColumn.getRemarks());
        method.addJavaDocLine(sb.toString().replace("\n", " "));
        method.addJavaDocLine(" */");
    }
    @Override
    public void addSetterComment(Method method, IntrospectedTable introspectedTable,
                                 IntrospectedColumn introspectedColumn) {
        if (suppressAllComments) {
            return;
        }
        method.addJavaDocLine("/**");
        StringBuilder sb = new StringBuilder();
        sb.append(" * ");
        sb.append(introspectedColumn.getRemarks());
        method.addJavaDocLine(sb.toString().replace("\n", " "));
        Parameter parm = method.getParameters().get(0);
        sb.setLength(0);
        sb.append(" * @param ");
        sb.append(parm.getName());
        sb.append(" ");
        sb.append(introspectedColumn.getRemarks());
        method.addJavaDocLine(sb.toString().replace("\n", " "));
        method.addJavaDocLine(" */");
    }
    @Override
    public void addClassComment(InnerClass innerClass, IntrospectedTable introspectedTable, boolean markAsDoNotDelete) {
        if (suppressAllComments) {
            return;
        }
        StringBuilder sb = new StringBuilder();
        innerClass.addJavaDocLine("/**");
        sb.append(" * ");
        sb.append(introspectedTable.getFullyQualifiedTable());
        innerClass.addJavaDocLine(sb.toString().replace("\n", " "));
        sb.setLength(0);
        sb.append(" * @author ");
        sb.append(systemPro.getProperty("user.name"));
        sb.append(" ");
        sb.append(currentDateStr);
        innerClass.addJavaDocLine(" */");
    }
}

package com.china.springbootmybatis.config;

import java.io.IOException;
import java.io.InputStream;
import java.net.URISyntaxException;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

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

/**
 * 描述：
 * @since 1.9.10
 * @version 1.9.10
 * @作者：niexiaohui
 * @創建時間：2016年11月22日
 *  https://www.cnblogs.com/mengzw/p/6655001.html
 * https://blog.csdn.net/u011781521/article/details/78161201
 * https://blog.csdn.net/xinbumi/article/details/99621848
 *
 * https://www.cnblogs.com/pixy/p/5038275.html
 * https://blog.csdn.net/isea533/article/details/83045335
 *
 * https://blog.csdn.net/isea533/article/details/42102297
 */
public class StartUp {
    public static void main(String[] args) throws URISyntaxException {
        try {
            List<String> warnings = new ArrayList<String>();
            boolean overwrite = true;
            ClassLoader classloader = Thread.currentThread().getContextClassLoader();
            InputStream is = classloader.getResourceAsStream("generatorConfig.xml");
            ConfigurationParser cp = new ConfigurationParser(warnings);
            Configuration config = cp.parseConfiguration(is);
            DefaultShellCallback callback = new DefaultShellCallback(overwrite);
            MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
            myBatisGenerator.generate(null);
        } catch (SQLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (InvalidConfigurationException e) {
            e.printStackTrace();
        } catch (XMLParserException e) {
            e.printStackTrace();
        }
    }
}

 然後啓動main 方法。就可以生成的model 中就有中文註釋了。

注意問題：
1、我的mysql  是8.0  所以驅動有所修改。

driver-class-name: com.mysql.cj.jdbc.Driver

com.mysql.jdbc.Driver 是 mysql-connector-java 5中的，
com.mysql.cj.jdbc.Driver 是 mysql-connector-java 6中的

2、生成文件的目錄要配置好：

classPathEntry ： 改爲本地的mysql 地址
targetProject： 改爲項目的絕對路徑 

3、Mybatis Generator 生成的mapper只有insert方法

請查看錶是否設置主鍵！！！！！  （兩個小時的教訓）

參考：

   https://www.cnblogs.com/mengzw/p/6655001.html
  https://blog.csdn.net/u011781521/article/details/78161201
  https://blog.csdn.net/xinbumi/article/details/99621848
  https://www.cnblogs.com/pixy/p/5038275.html
  https://blog.csdn.net/isea533/article/details/83045335
  https://blog.csdn.net/isea533/article/details/42102297