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因为mybatis的tinyint默认映射为bit类型，代码不方便操作和转换。因此需要对类型进行转化

插件地址：（https://github.com/suyin58/mybatis-generator-tddl/blob/master/generator-plugin/src/main/java/com/toolplat/generator/plugins/JavaTypeResolverMybatisDefaultImpl.java）

插件需要继承JavaTypeResolverDefaultImpl，并重写overrideDefaultType方法。针对需要转化的数据类型进行特殊处理

public class JavaTypeResolverMybatisDefaultImpl extends JavaTypeResolverDefaultImpl {

    @Override
    protected FullyQualifiedJavaType overrideDefaultType(IntrospectedColumn column, FullyQualifiedJavaType defaultType) {
        FullyQualifiedJavaType answer = defaultType;

        switch (column.getJdbcType()) {
            case Types.BIT:
                answer = this.calculateBitReplacement(column, defaultType);
                break;
            case Types.NUMERIC:
            case Types.DECIMAL:
                answer = this.calculateBigDecimalReplacement(column, defaultType);
                break;
            case Types.TINYINT:
                answer = new FullyQualifiedJavaType(Integer.class.getName());
                break;
            default:
                break;
        }

        return answer;
    }
}

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配置文件中添加该配置：（https://github.com/suyin58/mybatis-generator-tddl/blob/master/generator-test/src/test/resources/generatorConfigMyBatis3.xml）

 <!--
        默认false，把JDBC DECIMAL 和 NUMERIC 类型解析为 Integer
        true，把JDBC DECIMAL 和 NUMERIC 类型解析为java.math.BigDecimal
        -->
        <javaTypeResolver type="com.toolplat.generator.plugins.JavaTypeResolverMybatisDefaultImpl">
            <property name="forceBigDecimals" value="true" />
        </javaTypeResolver>

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