Mybatis spring boot how to create dynamic update query - spring-boot

Question

I have given the mybatis update qry below, In which update query specified in a static way. In my case i have to make it dynamic based on the incoming fields.
#Update("UPDATE guestpayment SET " +
"SourceSystemUpdated=#{sourcesysupdated}," +
"SourceSystemUpdateComment=#{sourcesysupdatedcomments}" +
"WHERE PrimaryId=#{PrimaryId}")
void updateguestpayment(Guestpayment updateguestpayment);
How to make the update query dynamic based on the incoming fields as jsonobject?
Mapper xml object
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.mybatis.mybatis.dao.GuestpaymentDAO">
<resultMap id="Guestpayment" type="com.mybatis.mybatis.models.Guestpayment" >
<id property="PrimaryId" column="PrimaryId" javaType="int" jdbcType="integer" />
<result property="SourceSystemUpdated" column="SourceSystemUpdated" javaType="string" jdbcType="VARCHAR" />
<result property="SourceSystemUpdateComment" column="SourceSystemUpdateComment" javaType="string" jdbcType="VARCHAR" />
</resultMap>
<update id="updateguestpayment">
update guestpayment as g
<set >
<if test="updateguestpayment.SourceSystemUpdated != null and updateguestpayment.SourceSystemUpdated != ''" >
g.SourceSystemUpdated = #{updateguestpayment.SourceSystemUpdated} ,
</if>
<if test="updateguestpayment.SourceSystemUpdateComment != null and updateguestpayment.SourceSystemUpdateComment != ''">
<!-- No need to deal with commas, <set> will auto delete extra commas -->
g.SourceSystemUpdateComment = #{updateguestpayment.SourceSystemUpdateComment},
</if>
</set>
where g.PrimaryId = #{updateguestpayment.PrimaryId}
</update>
</mapper>
Guestpayment.java
package com.mybatis.mybatis.models;
import java.util.Date;
public class Guestpayment {
private int PrimaryId;
private String sourcesysupdated;
private String sourcesysupdatedcomments;
public int getPrimaryId() {
return PrimaryId;
}
public void setPrimaryId(int primaryId) {
PrimaryId = primaryId;
}
public String getSourcesysupdated() {
return sourcesysupdated;
}
public void setSourcesysupdated(String sourcesysupdated) {
this.sourcesysupdated = sourcesysupdated;
}
public String getSourcesysupdatedcomments() {
return sourcesysupdatedcomments;
}
public void setSourcesysupdatedcomments(String sourcesysupdatedcomments) {
this.sourcesysupdatedcomments = sourcesysupdatedcomments;
}
}
GuestpaymentDAO(interface)
#Mapper
#Repository
public interface GuestpaymentDAO {
void updateguestpayment(#Param("updateguestpayment") Guestpayment updateguestpayment);
}

Answer 1

You can use Criteria to create a dynamic update query. In your case, you can do it like below,
public class GuestPaymentDAO {
#PersistenceContext
private EntityManager em;
public void updateGustPayment(String sourcesysupdated, String sourcesysupdatedcomments, int PrimaryId) {
CriteriaBuilder cb = this.em.getCriteriaBuilder();
// create update
CriteriaUpdate<Guestpayment> update = cb.createCriteriaUpdate(Guestpayment.class);
// set the root class
Root e = update.from(Guestpayment.class);
// set update clause
if (sourcesysupdated != null) {
update.set("SourceSystemUpdated", sourcesysupdated);
}
if (sourcesysupdatedcomments != null) {
update.set("SourceSystemUpdateComment", sourcesysupdatedcomments);
}
// set where clause
update.where(cb.equal(e.get("PrimaryId"), PrimaryId));
// perform update
this.em.createQuery(update).executeUpdate();
}
}

Answer 2

Why not use mybatis xml and entity to cooperate with each other?
eg :
DAO
#Mapper
#Repository
public interface GuestpaymentDAO {
void updateguestpayment(#Param("updateguestpayment") Guestpayment updateguestpayment);
}
mybatis mapper xml file: GuestpaymentDAO.xml
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.demo.dao.GuestpaymentDAO">
<resultMap id="Guestpayment" type="com.example.demo.entity.Guestpayment" >
<id property="PrimaryId" column="PrimaryId" javaType="string" jdbcType="VARCHAR" />
<result property="SourceSystemUpdated" column="SourceSystemUpdated" javaType="string" jdbcType="VARCHAR" />
<result property="SourceSystemUpdateComment" column="SourceSystemUpdateComment" javaType="string" jdbcType="VARCHAR" />
</resultMap>
<update id="updateguestpayment">
update Guestpayment as g
<set >
<if test="updateguestpayment.SourceSystemUpdated != null and updateguestpayment.SourceSystemUpdated != ''" >
g.SourceSystemUpdated = #{updateguestpayment.SourceSystemUpdated} ,
</if>
<if test="updateguestpayment.SourceSystemUpdateComment != null and updateguestpayment.SourceSystemUpdateComment != ''">
<!-- No need to deal with commas, <set> will auto delete extra commas -->
g.SourceSystemUpdateComment = #{updateguestpayment.SourceSystemUpdateComment},
</if>
</set>
where g.PrimaryId = #{updateguestpayment.PrimaryId}
</update>
</mapper>
doc: https://mybatis.org/mybatis-3/sqlmap-xml.html
src:src image