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PostgreSQL to MySQL

Discussion in 'Databases' started by bumbar, Jul 1, 2019.

  1. #1

    Bellow is PostgreSQL table.

    -- Table: document
    CREATE TABLE document (
        id int  NOT NULL,
        description varchar(1024)  NOT NULL,
        location varchar(1024)  NOT NULL,
        patient_id int  NOT NULL,
        CONSTRAINT document_pk PRIMARY KEY (id)
    -- Reference: document_patient (table: document)
    ALTER TABLE document ADD CONSTRAINT document_patient
        FOREIGN KEY (patient_id)
        REFERENCES patient (id)
    Code (markup):
    How to convert this " NOT DEFERRABLE INITIALLY IMMEDIATE " to compatible with MySQL ?
    bumbar, Jul 1, 2019 IP
  2. jestep

    jestep Prominent Member

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    That feature is not supported in mysql. You would need to look at mysql docs to see if that would pose a problem to your application. IME, I've never needed this functionality in MySQL, just use NOT NULL to require a value to be inserted in a constrained field, or: SET FOREIGN_KEY_CHECKS=0; before performing a bulk insert, if that's what this is being used for, and I believe it would provide a similar constraint, but again depending on how the application is designed, you may need to alter the application to get it to work properly. In the case of SET FOREIGN_KEY_CHECKS=0;, you may run into a situation where you have to manually clean up data if you have nulls or collisions during a bulk import when you try to turn foreign key checks back on.
    jestep, Jul 15, 2019 IP
  3. hostechsupport

    hostechsupport Well-Known Member

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    This can be converted by DB developer. With DEFERRABLE INITIALLY IMMEDIATE, you can defer the constraints on demand when you need it.
    hostechsupport, Jul 31, 2019 IP