In the PostgreSQL database, if a field is judged to exist, the update operation is performed. If it does not exist, the insert operation is performed

In the actual project development process , I often encounter some kind of business , Determine whether the data exists according to a certain field , If not, proceed insert operation , If it exists, it will be carried out according to this field update operation ：

<insert id="insertProject" parameterType="com.lenovo.mcmp.rm.etl.model.param.resourceConfig.CreateResourceConfigParam">
INSERT INTO project(project_code,project_name,start_time,age)
VALUES(#{
    project_code},#{
    project_name},'2018-01-10 22:00:00',24)
ON conflict(project_code) 
DO UPDATE SET project_name= #{
    project_name}, start_time='2018-02-22 12:00:00'
</insert>

You can also judge whether this piece of data already exists according to multiple fields ：

<insert id="insertProject" parameterType="com.lenovo.mcmp.rm.etl.model.param.resourceConfig.CreateResourceConfigParam">
INSERT INTO project(project_code,project_name,start_time,age)
VALUES(#{
    project_code},#{
    project_name},'2018-01-10 22:00:00',24)
ON conflict(project_code,age) 
DO UPDATE SET project_name= #{
    project_name}, start_time='2018-02-22 12:00:00'
</insert>