datasource:
    pgsql:
      jdbcUrl: jdbc:postgresql://ip:5432/ams?rewriteBatchedStatements=true&stringtype=unspecified
      username: 
      password: 
      driver-class-name: org.postgresql.Driver

// 這里對應(yīng)表中字段的類型
@MappedJdbcTypes(JdbcType.OTHER)
// 這里對應(yīng)實體類的類型
@MappedTypes(ParameterLimiting.class)
public class ParameterLimitingToJsonHandler extends BaseTypeHandler<ParameterLimiting> {
    @Override
    public void setNonNullParameter(PreparedStatement preparedStatement, int i, ParameterLimiting parameterLimiting, JdbcType jdbcType) throws SQLException {
    	// 做寫入操作時將對象轉(zhuǎn)成json字符串
        preparedStatement.setObject(i, JSON.toJSONString(parameterLimiting));
    }
    @Override
    public ParameterLimiting getNullableResult(ResultSet resultSet, String s) throws SQLException {
        return null;
    }
    @Override
    public ParameterLimiting getNullableResult(ResultSet resultSet, int i) throws SQLException {
        return null;
    }
    @Override
    public ParameterLimiting getNullableResult(CallableStatement callableStatement, int i) throws SQLException {
        return null;
    }
}

<insert id="addParameter" parameterType="com.inventec.dm.entity.po.ParameterEntity">
        INSERT INTO dap.parameter
        ("device", "recipe", "parameter", "name", "type", "valueType", "limiting")
        VALUES (#{device}, #{recipe}, #{parameter}, #{name}, #{type}, #{valueType},
        		<!--  這里需要指定 jdbcType 及 typeHandler 屬性，這里的 typeHandler 也就是我們剛寫的對象轉(zhuǎn)Json的控制類  -->
                #{limiting,jdbcType=OTHER,typeHandler=com.inventec.dm.config.ParameterLimitingToJsonHandler});
</insert>

<select id="getParametersByDeviceId" resultMap="parameterToParameterEntity">
        SELECT *
        FROM dap.parameter
        WHERE device = #{device};
</select>
<resultMap id="parameterToParameterEntity" type="com.inventec.dm.entity.po.ParameterEntity">
        <result property="device" column="device"/>
        <result property="recipe" column="recipe"/>
        <result property="parameter" column="parameter"/>
        <result property="name" column="name"/>
        <result property="type" column="type"/>
        <result property="valueType" column="valueType"/>
        <-- 這里需要指定jdbcType、javaType、typeHandler屬性，其中typeHandler還是上邊的轉(zhuǎn)換控制類 -->
        <result property="limiting" column="limiting"
                jdbcType="OTHER" javaType="com.inventec.dm.entity.parameter.ParameterLimiting"
                typeHandler="com.inventec.dm.config.ParameterLimitingToJsonHandler"/>
</resultMap>

@Data
@Builder
@ToString
public class ParameterEntity {
    private String device;
    private String recipe;
    private String parameter;
    private String name;
    private String type;
    private String valueType;
    private ParameterLimiting limiting;
    // 這個實體類中不能有無參構(gòu)造，否則在映射json字段時不執(zhí)行有參構(gòu)造
    // 注意這里最后的一個參數(shù)是 Object limiting，而不是 ParameterLimiting limiting
    public ParameterEntity(String device, String recipe, String parameter, String name, String type, String valueType, Object limiting) {
        this.device = device;
        this.recipe = recipe;
        this.parameter = parameter;
        this.name = name;
        this.type = type;
        this.valueType = valueType;
        if (limiting != null) {
            this.limiting = JSON.parseObject(limiting.toString(), ParameterLimiting.class);
        }
    }
}