mybatis 逆向工程demo下载

要下载 MyBatis 逆向工程 Demo，可以按照以下步骤进行操作：

1. 打开浏览器，进入 MyBatis 官方网站（mybatis.org）。
2. 在官网首页的导航栏或搜索栏中找到 "Download" 或 "下载" 选项，并点击进入下载页面。
3. 在下载页面中，找到 "Samples" 或 "示例" 选项，并点击进入示例下载页面。
4. 在示例下载页面中，搜索 "MyBatis 逆向工程 Demo" 或类似的关键词。
5. 找到符合要求的逆向工程 Demo 示例，点击相关链接进行下载。注意选择适合你使用的版本。
6. 下载完成后，将文件保存到本地的合适位置，例如你的项目文件夹中。
7. 解压缩下载的文件，查看其中的说明文档或示例代码，理解其用法和功能。
8. 根据示例中的指引，配置和修改项目文件，以适应你的实际需求和数据库环境。
9. 利用逆向工程 Demo 提供的代码生成功能，根据数据库表结构自动生成对应的实体类、Mapper 接口和 XML 文件。
10. 在生成的代码基础上，根据业务需求进行适当的修改和扩展。
11. 将逆向工程生成的代码整合到你的项目中，并进行适当的代码调整和配置。
12. 最后，测试和调试你的项目，确保逆向工程功能正常运行。

通过以上步骤，你就可以成功下载并运行 MyBatis 逆向工程 Demo，并根据实际需求生成对应的代码。祝你成功使用 MyBatis 逆向工程！

相关问题

spring boot mybatis逆向工程

### Spring Boot MyBatis Generator Reverse Engineering Code Generation Tutorial

Incorporating MyBatis Generator into a Spring Boot project allows for the automatic creation of Java classes based on existing database tables, streamlining development processes significantly[^1]. The following sections detail how to set up and utilize MyBatis Generator within a Spring Boot environment.

#### Prerequisites

Ensure that Maven or Gradle is installed as these tools will be used to manage dependencies. Additionally, have an operational MySQL (or any other supported RDBMS) instance with at least one table ready for reverse engineering purposes.

#### Adding Dependencies

Add necessary dependencies in `pom.xml` when using Maven:

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.2.0</version>
</dependency>

<!-- For generating code -->
<build>
    <plugins>
        <plugin>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-maven-plugin</artifactId>
            <version>1.4.0</version>
            <configuration>
                <verbose>true</verbose>
                <overwrite>true</overwrite>
            </configuration>
        </plugin>
    </plugins>
</build>

For Gradle users, add similar configurations accordingly.

#### Configuration File Setup

Create a configuration file named `generatorConfig.xml`. Place it under resources directory which specifies details about JDBC connection along with targetProject where generated files should reside:

<?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>
    <!-- Database Connection Information -->
    <context id="DB2Tables" targetRuntime="MyBatis3Simple">
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/your_database_name?useSSL=false&serverTimezone=UTC"
                        userId="root"
                        password="password"/>

        <!-- Specify Where Generated Files Should Go -->
        <javaModelGenerator targetPackage="com.example.demo.model" targetProject="src/main/java"/>
        <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources"/>
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.example.demo.mapper" targetProject="src/main/java"/>
        
        <!-- Define Which Tables To Generate From -->
        <table tableName="example_table" domainObjectName="ExampleTable"/>
    </context>
</generatorConfiguration>

This setup ensures proper mapping between SQL queries and POJOs while also creating mapper interfaces automatically.

#### Running the Generator

With everything configured correctly, run the plugin via command line (`mvn mybatis-generator:generate`) or through IDE plugins designed specifically for executing Maven goals. After successful execution, check specified directories for newly created model entities alongside corresponding XML mappers.

By adhering closely to above guidelines, developers can efficiently leverage MyBatis Generator's capabilities without needing extensive manual coding efforts related to data access layers.

--related questions--

1. How does integrating MyBatis Generator impact application performance?
2. What alternatives exist besides MyBatis for ORM frameworks compatible with Spring Boot applications?
3. Can MyBatis Generator support multiple databases simultaneously during reverse engineering process?
4. Is there any way to customize templates used by MyBatis Generator for more tailored outputs?
5. Are there specific scenarios where not using an ORM tool like MyBatis might prove beneficial over traditional JDBC approaches?

mybatis逆向工程时间段查询

mybatis逆向工程本身并不支持时间段查询，但可以通过在生成的Example类中手动添加时间段查询的方法来实现。具体步骤如下：

1. 在逆向工程生成的Example类中添加两个属性，表示时间段的起始时间和结束时间，例如：

private Date startTime;
private Date endTime;

2. 在Example类中添加两个对应的Criteria方法，用于设置时间段查询条件，例如：

public Criteria andCreateTimeBetween(Date value1, Date value2) {
    addCriterion("create_time between", value1, value2, "createTime");
    return (Criteria) this;
}

public Criteria andCreateTimeNotBetween(Date value1, Date value2) {
    addCriterion("create_time not between", value1, value2, "createTime");
    return (Criteria) this;
}

3. 在Mapper.xml文件中使用生成的Criteria方法进行时间段查询，例如：

<select id="selectByExample" parameterType="com.example.demo.model.UserExample" resultMap="BaseResultMap">
    select
    <include refid="Base_Column_List" />
    from user
    <if test="example != null">
        <where>
            <foreach collection="example.oredCriteria" item="criteria" separator="or">
                <if test="criteria.valid">
                    <trim prefix="(" suffix=")" prefixOverrides="and">
                        <foreach collection="criteria.criteria" item="criterion">
                            <choose>
                                <when test="criterion.noValue">
                                    and ${criterion.condition}
                                </when>
                                <when test="criterion.singleValue">
                                    and ${criterion.condition} #{criterion.value}
                                </when>
                                <when test="criterion.betweenValue">
                                    and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
                                </when>
                                <when test="criterion.listValue">
                                    and ${criterion.condition}
                                    <foreach close=")" collection="criterion.value" open="(" separator=",">
                                        #{item}
                                    </foreach>
                                </when>
                            </choose>
                        </foreach>
                    </trim>
                </if>
            </foreach>
            <if test="example.startTime != null">
                and create_time &gt;= #{example.startTime}
            </if>
            <if test="example.endTime != null">
                and create_time &lt;= #{example.endTime}
            </if>
        </where>
    </if>
</select>