mybatisplus json自动转实体类

实体类

package com.mmwzcloud.jszj.module.jszj.dal.dataobject.jszjmemberuserpaymentrecord; import com.mmwzcloud.jszj.framework.commonjszj.dto.UserPaymentRecordBizJsonDto; import com.mmwzcloud.jszj.framework.commonjszj.mybatisplustypehandler.UserPaymentRecordBizJsonTypeHandler; import lombok.*; import java.math.BigDecimal; import com.baomidou.mybatisplus.annotation.*; import com.mmwzcloud.jszj.framework.mybatis.core.dataobject.BaseDO; /** * 用户支付记录 DO * * @author 景春德 */ @TableName(value = "jszj_member_user_payment_record", autoResultMap = true) @KeySequence("jszj_member_user_payment_record_seq") // 用于 Oracle、PostgreSQL、Kingbase、DB2、H2 数据库的主键自增。如果是 MySQL 等数据库，可不写。 @Data @EqualsAndHashCode(callSuper = true) @ToString(callSuper = true) @Builder @NoArgsConstructor @AllArgsConstructor public class JszjMemberUserPaymentRecordDO extends BaseDO { /** * ID */ @TableId private Long id; /** * 用户ID */ private Long userId; /** * payment_type 支付类型 aliPayment:支付宝 weChatPayment:微信支付 */ private String paymentType; /** * 支付订单号 */ private String outTradeNo; /** * 状态 0:已生成未支付 1:已支付 2:退款中 3:退款成功 */ private Integer state; /** * 支付金额 */ private BigDecimal money; /** * 购买的业务表名 */ private String tableName; /** * 购买的业务表id */ private Long tableId; /** * 购买的业务表字段 */ private String tableField; /** * 支付的业务,如果支付的业务没有相关表,可以使用此字段记录支付业务的类型和数据 */ @TableField(value = "biz_json", typeHandler = UserPaymentRecordBizJsonTypeHandler.class) private UserPaymentRecordBizJsonDto bizJson; }

主要是 autoResultMap = true 和 @TableField(value = "biz_json", typeHandler = UserPaymentRecordBizJsonTypeHandler.class)

json对应的实体类

package com.mmwzcloud.jszj.framework.commonjszj.dto; import lombok.Data; import java.util.Map; @Data public class UserPaymentRecordBizJsonDto { //业务类型 private String bizType; //业务数据 private Map<String,String> bizData; }

转换的方法

package com.mmwzcloud.jszj.framework.commonjszj.mybatisplustypehandler; import com.fasterxml.jackson.core.JsonProcessingException; import com.fasterxml.jackson.databind.ObjectMapper; import com.mmwzcloud.jszj.framework.commonjszj.dto.UserPaymentRecordBizJsonDto; import org.apache.ibatis.type.BaseTypeHandler; import org.apache.ibatis.type.JdbcType; import org.apache.ibatis.type.MappedTypes; import java.sql.CallableStatement; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; @MappedTypes(UserPaymentRecordBizJsonDto.class) public class UserPaymentRecordBizJsonTypeHandler extends BaseTypeHandler<UserPaymentRecordBizJsonDto> { private static final ObjectMapper objectMapper = new ObjectMapper(); @Override public void setNonNullParameter(PreparedStatement ps, int i, UserPaymentRecordBizJsonDto parameter, JdbcType jdbcType) throws SQLException { try { String json = objectMapper.writeValueAsString(parameter); ps.setString(i, json); } catch (JsonProcessingException e) { throw new SQLException("Failed to convert UserPaymentRecordBizJsonDto to JSON", e); } } @Override public UserPaymentRecordBizJsonDto getNullableResult(ResultSet rs, String columnName) throws SQLException { return parseJson(rs.getString(columnName)); } @Override public UserPaymentRecordBizJsonDto getNullableResult(ResultSet rs, int columnIndex) throws SQLException { return parseJson(rs.getString(columnIndex)); } @Override public UserPaymentRecordBizJsonDto getNullableResult(CallableStatement cs, int columnIndex) throws SQLException { return parseJson(cs.getString(columnIndex)); } private UserPaymentRecordBizJsonDto parseJson(String json) { if (json == null || json.trim().isEmpty()) { return null; } try { return objectMapper.readValue(json, UserPaymentRecordBizJsonDto.class); } catch (JsonProcessingException e) { throw new RuntimeException("Failed to parse JSON to UserPaymentRecordBizJsonDto: " + json, e); } } }