Liquibase Change Types dropAllForeignKeyConstraints

A table in a relational database can support multiple forign keys as per requirements, Liquibase doesn't provide a specific tag to add multiple forign keys at once but this can be achieved via multiple changeset. Some time requirement is to drop all forign key , which can be achieved via dropping forign key one by one or Liquibase prvides dropAllForeignKeyConstraints to drop all forign keys on a table at once.

Add Multiple Foreign Key

Liquibase doesn't provide a specific tag to add multiple foreign keys, but more than one Foreign keys can be added via a separate createForignKey changeset.

<?xml version="1.1" encoding="UTF-8" standalone="no"?>
<databaseChangeLog xmlns="http://www.liquibase.org/xml/ns/dbchangelog" xmlns:ext="http://www.liquibase.org/xml/ns/dbchangelog-ext" xmlns:pro="http://www.liquibase.org/xml/ns/pro" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="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 http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-latest.xsd">
	<changeSet author="wesome" id="1692599548266-1">
		<createTable catalogName="appledb" tableName="apple">
			<column autoIncrement="true" name="apple_id" type="BIGINT">
				<constraints nullable="false" primaryKey="true" />
			</column>
			<column name="apple_name" type="VARCHAR(255)" />
		</createTable>
	</changeSet>
	<changeSet author="wesome" id="1692599548266-2">
		<createTable catalogName="appledb" tableName="supplier">
			<column autoIncrement="true" name="supplier_id" type="BIGINT">
				<constraints nullable="false" primaryKey="true" />
			</column>
			<column name="supplier_name" type="VARCHAR(255)" />
		</createTable>
	</changeSet>
	<changeSet author="wesome" id="1692599548266-3">
		<createTable catalogName="appledb" tableName="vendor">
			<column name="vendor_id" type="BIGINT">
			</column>
			<column name="vendor_name" type="VARCHAR(255)" />
			<column name="apple_id" type="BIGINT" />
			<column name="supplier_id" type="BIGINT" />
		</createTable>
	</changeSet>
	<changeSet author="wesome" id="1692599548266-4">
		<addForeignKeyConstraint baseColumnNames="apple_id" baseTableCatalogName="appledb" baseTableName="vendor" baseTableSchemaName="appledb" constraintName="apple_id_fk" onDelete="CASCADE" onUpdate="RESTRICT" referencedColumnNames="apple_id" referencedTableCatalogName="appledb" referencedTableName="apple" referencedTableSchemaName="appledb" validate="true" />
	</changeSet>
	<changeSet author="wesome" id="1692599548266-5">
		<addForeignKeyConstraint baseColumnNames="supplier_id" baseTableCatalogName="appledb" baseTableName="vendor" baseTableSchemaName="appledb" constraintName="supplier_id_fk" onDelete="CASCADE" onUpdate="RESTRICT" referencedColumnNames="supplier_id" referencedTableCatalogName="appledb" referencedTableName="supplier" referencedTableSchemaName="appledb" validate="true" />
	</changeSet>
</databaseChangeLog>

liquibase.properties (update changeLog File file format with SQL, XML, YAML, JSON as per changelog.mysql.)

changeLogFile=changelog.mysql.xml
liquibase.command.url:jdbc:mysql://localhost:3306/appleDb?createDatabaseIfNotExist=true&autoReconnect=true&useSSL=false&allowPublicKeyRetrieval=true
liquibase.command.username : root
liquibase.command.password : rootroot

Run command liquibase update

The foreign key constraints can be verified by running the query

SELECT TABLE_NAME,COLUMN_NAME,CONSTRAINT_NAME, REFERENCED_TABLE_NAME,REFERENCED_COLUMN_NAME FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE WHERE REFERENCED_TABLE_SCHEMA = 'appledb';

Drop All Forign Key Constraints

<?xml version="1.1" encoding="UTF-8" standalone="no"?>
<databaseChangeLog xmlns="http://www.liquibase.org/xml/ns/dbchangelog" xmlns:ext="http://www.liquibase.org/xml/ns/dbchangelog-ext" xmlns:pro="http://www.liquibase.org/xml/ns/pro" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="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 http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-latest.xsd">
	<changeSet author="wesome" id="1692599548266-6">
		<dropAllForeignKeyConstraints baseTableCatalogName="appleDb" baseTableName="vendor" baseTableSchemaName="appleDb" />
	</changeSet>
</databaseChangeLog>

liquibase.properties (update changeLog File file format with SQL, XML, YAML, JSON as per changelog.mysql.)

changeLogFile=changelog.mysql.xml
liquibase.command.url:jdbc:mysql://localhost:3306/appleDb?createDatabaseIfNotExist=true&autoReconnect=true&useSSL=false&allowPublicKeyRetrieval=true
liquibase.command.username : root
liquibase.command.password : rootroot

Run command liquibase update

The foreign key constraints can be verified by running the query

SELECT TABLE_NAME,COLUMN_NAME,CONSTRAINT_NAME, REFERENCED_TABLE_NAME,REFERENCED_COLUMN_NAME FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE WHERE REFERENCED_TABLE_SCHEMA = 'appledb';