setColumnRemarks

The setColumnRemarks Change Type sets remarks on a column.

Uses

You can typically use the setColumnRemarks Change Type when you want to alter the existing column by adding a comment to it.

Running the `setColumnRemarks` Change Type

To run this Change Type, follow these steps:

Add the Change Type to your changeset, as shown in the examples on this page.
Specify any required attributes. Use the table on this page to see which ones your database requires.
Deploy your changeset by running the update command:

liquibase update

Now, you should see the column with a remark.

Available attributes

Name	Description	Required for	Supports	Since
`catalogName`	Name of the catalog		asany, db2, db2z, h2, mariadb, mysql, oracle, postgresql	3.0
`columnName`	Name of the column	all	all
`remarks`	A short descriptive comment	all	all
`schemaName`	Name of the schema		all
`tableName`	Name of the table containing the column to set remarks on	all	all
`columnDataType`	Data type of the column. To help make scripts database-independent, Liquibase automatically converts the following generic data types to the correct database implementation: `BIGINT`, `BLOB`, `BOOLEAN`, `CHAR`, `CLOB`, `CURRENCY`, `DATE`, `DATETIME`, `DECIMAL`, `DOUBLE`, `FLOAT`, `INT`, `MEDIUMINT`, `NCHAR`, `NUMBER`, `NVARCHAR`, `SMALLINT`, `TIME`, `TIMESTAMP`, `TINYINT`, `UUID`, `VARCHAR`, `XML`. Also, specifying a `java.sql.Types.*` type is converted to the correct type as well. For example: `java.sql.Types.TIMESTAMP` `java.sql.Types.VARCHAR(255)`	mysql		4.3 (for XML)
`columnParentType`	Indicates the parent object type of the column we are setting remarks against. Valid values are `VIEW` and `TABLE`. Default: `TABLE`.

Examples

--liquibase formatted sql

--changeset liquibase-docs:setColumnRemarks-example
ALTER TABLE person 
MODIFY COLUMN NAME VARCHAR(50) 
COMMENT 'A String';

Note: The SQL to set column remarks is platform-specific. You need to modify the example depending on your database syntax.

databaseChangeLog:
-  changeSet:
    id:  setColumnRemarks-example
    author:  liquibase-docs
    changes:
    -  setColumnRemarks:
        catalogName:  department
        columnName:  id
        remarks:  A String
        schemaName:  public
        tableName:  person
        columnDataType:  int

{
    "databaseChangeLog": [
        {
            "changeSet": {
                "id": "setColumnRemarks-example",
                "author": "liquibase-docs",
                "changes": [
                    {
                        "setColumnRemarks": {
                            "catalogName": "department",
                            "columnName": "id",
                            "remarks": "A String",
                            "schemaName": "public",
                            "tableName": "person",
                            "columnDataType": "int"
                        }
                    }
                ]
            }
        }
    ]
}

<databaseChangeLog
    xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:ext="http://www.liquibase.org/xml/ns/dbchangelog-ext"
    xmlns:pro="http://www.liquibase.org/xml/ns/pro"
    xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog
        http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-latest.xsd
        http://www.liquibase.org/xml/ns/dbchangelog-ext
        http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-ext.xsd
        http://www.liquibase.org/xml/ns/pro
        http://www.liquibase.org/xml/ns/pro/liquibase-pro-latest.xsd">

    <changeSet author="liquibase-docs" id="setColumnRemarks-example">
        <setColumnRemarks catalogName="department"
            columnName="id"
            remarks="A String"
            schemaName="public"
            tableName="person"
            columnDataType="int"/>
    </changeSet>

</databaseChangeLog>

Database support