存在しない場合はmysql

私は決してデータベースの専門家ではありませんが、これが私のやり方です。

http：//www.somethinghitme。 com / 2010/05/06 / mysql-stored-procedures-if-not-exists /

    DECLARE SomeId int;
    DECLARE CheckExists int;
    SET CheckExists = 0;  

    SELECT 1 INTO CheckExists from lookup_table WHERE someField = in_SomeParam LIMIT 1;   

    IF (CheckExists > 0) THEN
        SELECT id INTO SomeId FROM lookup_table WHERE someField = in_SomeParam;
    ELSE
        INSERT INTO lookup_table (someField ) VALUES(in_SomeParam);
        SELECT SomeId = LAST_INSERT_ID();
    END IF;