Question

I have my table structure like:

CREATE TABLE test_two_tabel.T1 ( T1_ID INT NOT NULL AUTO_INCREMENT , A1 INT NULL , B1 VARCHAR(45) NULL , C1 VARCHAR(45) NULL , D1 DATETIME NULL , PRIMARY KEY (T1_ID) );

In Grails:

package twotables

class T1 {

    Integer a
    String b
    String c
    Date d

    static mapping = {
        table "T1"
        version false
        id column:"T1_ID"
        a1 column:"a1"
        b1 column:"b1"
        c1 column:"c1"
        d1 column:"d1"
    }

    static constraints = {
        id()
        a1()
        b1()
        c1()
        d1()
    }
}

Every time I execute my program… Grails deletes my tables in the DB, does anyone know what’s happening?

Answer 1

You need to change value of dbCreate from ‘create-drop’ to ‘update’ at grails-app/conf/DataSource.groovy

You current value probably is:

development {
    dataSource {
        dbCreate = "create-drop" // one of 'create', 'create-drop','update'
        url = "***"
    }
}

this means that Grails will recreate all tables on every restart. If you’ll set this as update it will try to update table structure, according to your data model classes.

You can read more about Grails DB configuration at http://www.grails.org/doc/latest/guide/3.%20Configuration.html#3.3%20The%20DataSource