如何解决Mybatis Generator将tinyint映射为Byte和Boolean的问题

小编给大家分享一下如何解决Mybatis Generator将tinyint映射为Byte和Boolean的问题，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！

1. 对于tinyint(4)映射为Byte

1.1 环境

• spring boot 2.1.x

• mybatis

• tk.mybatis

• mysql

1.2 自定义类型解析器

（1） 新建以下类

public class CustomerJavaTypeResolver extends JavaTypeResolverDefaultImpl {

    public CustomerJavaTypeResolver() {
        super();
        //把数据库的 TINYINT 映射成 Integer
        super.typeMap.put(Types.TINYINT, new JavaTypeResolverDefaultImpl.JdbcTypeInformation("TINYINT", new FullyQualifiedJavaType(Integer.class.getName())));
    }
}

（2）在pom.xml中加入

<build>
        <plugins>
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.6</version>
                <dependencies>
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>5.1.29</version>
                    </dependency>
                    <!--<dependency>
                        <groupId>org.mybatis.generator</groupId>
                        <artifactId>mybatis-generator-core</artifactId>
                        <version>1.3.6</version>
                    </dependency>-->
                    <dependency>
                        <groupId>com.taco.cloud</groupId>
                        <artifactId>-generator-core</artifactId>
                        <version>1.0-SNAPSHOT</version>
                    </dependency>
                    <dependency>
                        <groupId>tk.mybatis</groupId>
                        <artifactId>mapper</artifactId>
                        <version>4.1.5</version>
                    </dependency>
                </dependencies>
                <!--<executions>
                    <execution>
                        <id>Generate MyBatis Artifacts</id>
                        <phase>package</phase>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                    </execution>
                </executions>-->
                <configuration>
                    <!--允许移动生成的文件 -->
                    <verbose>true</verbose>
                    <!-- 是否覆盖 -->
                    <overwrite>true</overwrite>
                    <!-- 自动生成的配置 -->
                    <configurationFile>
                        src/main/resources/mybatis-generator.xml</configurationFile>
                </configuration>
            </plugin>
        </plugins>
    </build>

（3）修改mybatis-generator.xml文件，加入

<javaTypeResolver type="com.taco.springcloud.generator.CustomerJavaTypeResolver">
            <!--
            true：使用BigDecimal对应DECIMAL和 NUMERIC数据类型
            false：默认,
               scale>0;length>18：使用BigDecimal;
               scale=0;length[10,18]：使用Long；
               scale=0;length[5,9]：使用Integer；
               scale=0;length<5：使用Short；
             -->
            <property name="forceBigDecimals" value="false"/>

        </javaTypeResolver>

2. 对于tinyint(1)映射为Boolean情况

2.1 解决方法

1. JDBC的URL增加 tinyInt1isBit=false参数，注意参数名区分大小写，否则不生效

   例如：jdbc:mysql://${ucmha.proxy1_2.host}/${db.mysql.db}?tinyInt1isBit=false

2. 用tinyint(2)代替

以上是“如何解决Mybatis Generator将tinyint映射为Byte和Boolean的问题”这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注亿速云行业资讯频道！