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To implement a schema level update, two steps must be taken:

The new numeric schema level must be specified in the plugin’s descriptor file.
The actual schema update must be implemented.

Define new schema level in plugin descriptor

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Codeblock

language	json

{
    "$schema": "http://git.intra.pinuts.de/cmsbs/cmsbs/raw/master/doc/json-schemas/plugin.desc.json",
    "__encoding": "Pinuts File Encoding: UTF-8",
    "name": "de.acme.tutorial",
    ...,
    "dbSchema": 1
}

Implement schema update

Create a new ES6 file in your plugin’s CSE directory. If your plugin’s name is de.acme.projectxtutorial then cmsbs-conf/cse/plugins/de.acme.projectxtutorial/callback/DbSchemaUpdate.es6mjs would be a good choice:

Codeblock

language	js

/// <reference path="../../../.vscode.js"/>

const SQL = UM.config.sql;

export default class DbSchemaMigration extends PluginSchemaMigration {
    schemaUpdate_0_1(scr) {
        // Create column for primary attribute "new_attribute":
        this.primaryAddColumn(scr, UM.config.getAttribute('new_attribute'));

        // Alter primary attribute's column according to the current settings from *.attributes file:
        this.primaryModifyColumn(scr, UM.config.getAttribute('altered_attribute'));

        // Create column for new table attribute's column:
        this.tableAddColumn(scr, UM.config.getAttribute('table_attribute->new_column'));

        // Alter table attribute's column according to the current settings from *.attributes file:
        this.tableModifyColumn(scr, UM.config.getAttribute('table_attribute->altered_column'));
        
        // Issue SQL statement to create an INDEX:
        this.primaryAddIndex(scr, UM.config.getAttribute('new_attribute'));

        // Issue SQL statement to mass-update some user entries:
        const createIndex1update1 = new SqlQuery(`CREATE INDEX idx_users_new_attr ON`UPDATE ${SQL.qualifyTable('users')} (SET p_new_attribute)`)entrytype='user' WHERE p_entrytype IS NULL`);
        scr.add(createIndex1update1);
        
        //  this.primaryAddColumn(scr, UM.config.getAttribute("active"));
Issue SQL statement to mass-update some user entries:
        const update1update2 = new SqlQuery(`UPDATE ${SQL.qualifyTable('users')} SET p_entrytype='usercustomer' WHERE p_entrytype IS NULL`='user'`);
        scr.add(update1update2);
    }
}

// Don't forget to export the class to the respective namespace:
de.acme.projectxtutorial.DbSchemaMigration = DbSchemaMigration;

The method schemaUpdate_0_1 will be executed upon UM startup whenever the recorded schema level for the plugin de.acme.projectx is below “1”.

To implement a second schema update, just increase the dbSchema counter in your plugin descriptor file and implement the schemaUpdate_1_2 method.

There are several helper methods available to accomplish common tasks like adding or altering columns or executing custom SQL statements:

Hinweis

Please keep in mind that a database schema update cannot be undone automatically!

Have a fresh backup at hand to be able to rollback the database if needed.

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Define new schema level in plugin descriptor

Implement schema update