mybatis枚举类型自定义处理类

 类都在包 default下创建

1、先定义一个接口类

public interface BaseEnum {

    public String getValue();

    public String getName();
    
}

2、让一个枚举类型实现这个接口

public enum EnumTest implements BaseEnum {
    TEST_ONE("test1", "测试一"),
    TEST_TWO("test2", "测试二");

    private EnumTest(String value, String name) {
        this.name = name;
        this.value = value;
    }
    
    private String name;
    
    private String value;
    
    @Override
    public String getName() {
        return this.name;
    }

    @Override
    public String getValue() {
        return this.value;
    }

    public static EnumTest enumValueOf(String value) {
        EnumTest[] values = EnumTest .values();
        for (EnumTest test : values) {
            if (value.equalsIgnoreCase(test.getValue())) {
                return test;
            }
        }
        
        return null;
    }

}

3、创建mybatis枚举类型处理类

public class BaseEnumTypeHandler<E extends BaseEnum> extends BaseTypeHandler<E> {

    private final Class<E> type;

    public BaseEnumTypeHandler(Class<E> type) {
        if (type == null) {
            throw new IllegalArgumentException("Type argument cannot be null");
        }
        this.type = type;
    }

    @Override
    public void setNonNullParameter(PreparedStatement ps, int i, E parameter, JdbcType jdbcType) throws SQLException {
        ps.setString(i, parameter.getValue());
    }

    
    @Override
    public E getNullableResult(ResultSet rs, String columnName) throws SQLException {
        String s = rs.getString(columnName);
        BaseEnum[] baseEnumArr = this.type.getEnumConstants();
        E baseEnum = valueOfString(baseEnumArr, s);
        return baseEnum;
    }

    @Override
    public E getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
        String s = rs.getString(columnIndex);
        BaseEnum[] baseEnumArr = this.type.getEnumConstants();
        E baseEnum = valueOfString(baseEnumArr, s);
        return baseEnum;
    }
    
    @Override
    public E getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
        String s = cs.getString(columnIndex);
        BaseEnum[] baseEnumArr = this.type.getEnumConstants();
        E baseEnum = valueOfString(baseEnumArr, s);
        return baseEnum;
    }
    
    @SuppressWarnings("unchecked")
    private E valueOfString(BaseEnum[] baseEnumArr, String value) {
        if (baseEnumArr == null || StringUtils.isBlank(value)) {
            return null;
        }
        
        for (BaseEnum baseEnum : baseEnumArr) {
            if (value.equalsIgnoreCase(baseEnum.getValue())) {
                return (E) baseEnum;
            }
        }
        
        return null;
    }

}

4、在mybatis配制文件mybatis.cfg.xml里添加一个配制

<typeHandlers>
        <typeHandler handler="BaseEnumTypeHandler" javaType="EnumTest"/>
    </typeHandlers>