Package liquibase.change.core

Class DropColumnChange

java.lang.Object

liquibase.AbstractExtensibleObject

liquibase.plugin.AbstractPlugin

liquibase.change.AbstractChange

liquibase.change.core.DropColumnChange

All Implemented Interfaces:

Cloneable, Change, ChangeWithColumns<ColumnConfig>, ExtensibleObject, Plugin, LiquibaseSerializable

public class DropColumnChange
extends AbstractChange
implements ChangeWithColumns<ColumnConfig>

Drops an existing column from a table.

Nested Class Summary

Nested classes/interfaces inherited from interface liquibase.serializer.LiquibaseSerializable

LiquibaseSerializable.SerializationType

Field Summary

Fields inherited from class liquibase.change.AbstractChange

NODENAME_COLUMN

Fields inherited from interface liquibase.change.Change

EMPTY_CHANGE, SHOULD_EXECUTE

Fields inherited from interface liquibase.serializer.LiquibaseSerializable

GENERIC_CHANGELOG_EXTENSION_NAMESPACE, GENERIC_SNAPSHOT_EXTENSION_NAMESPACE, STANDARD_CHANGELOG_NAMESPACE, STANDARD_SNAPSHOT_NAMESPACE

Fields inherited from interface liquibase.plugin.Plugin

PRIORITY_DATABASE, PRIORITY_DEFAULT, PRIORITY_NOT_APPLICABLE, PRIORITY_SPECIALIZED

Constructor Summary

Constructors

Constructor	Description
DropColumnChange()

Method Summary

Modifier and Type	Method	Description
void	addColumn(ColumnConfig column)	Add a column configuration to the Change.
ChangeStatus	checkStatus(Database database)	Validate that this change executed successfully against the given database.
SqlStatement[]	generateStatements(Database database)	Generates the SqlStatement objects required to run the change for the given database.
boolean	generateStatementsVolatile(Database database)	Implementation delegates logic to the SqlGenerator.generateStatementsIsVolatile(Database) method on the SqlStatement objects returned by Change.generateStatements(liquibase.database.Database).
String	getCatalogName()
String	getColumnName()
List<ColumnConfig>	getColumns()	Return all the ColumnConfig objects defined for this Change
String	getConfirmationMessage()	Confirmation message to be displayed after the change is executed.
String	getSchemaName()
Object	getSerializableFieldValue(String field)
String	getSerializedObjectNamespace()
String	getTableName()
void	setColumns(List<ColumnConfig> columns)
boolean	supports(Database database)	Implementation delegates logic to the SqlGenerator.supports(liquibase.statement.SqlStatement, liquibase.database.Database) method on the SqlStatement objects returned by Change.generateStatements(liquibase.database.Database).
ValidationErrors	validate(Database database)	Implementation checks the ChangeParameterMetaData for declared required fields and also delegates logic to the SqlGenerator.validate(liquibase.statement.SqlStatement, liquibase.database.Database, liquibase.sqlgenerator.SqlGeneratorChain) method on the SqlStatement objects returned by Change.generateStatements(liquibase.database.Database).

Methods inherited from class liquibase.change.AbstractChange

createAlternateParameterNames, createChangeMetaData, createChangeParameterMetadata, createDescriptionMetaData, createEmptyColumnConfig, createExampleValueMetaData, createInverses, createMustEqualExistingMetaData, createRequiredDatabasesMetaData, createSerializationTypeMetaData, createSinceMetaData, createSupportedDatabasesMetaData, customLoadLogic, equals, finishInitialization, generateCheckSum, generateRollbackStatements, generateRollbackStatementsVolatile, getAffectedDatabaseObjects, getChangeSet, getDescription, getExcludedFieldFilters, getResourceAccessor, getSerializableFieldNamespace, getSerializableFields, getSerializableFieldType, getSerializedObjectName, hashCode, isInvalidProperty, load, modify, serialize, serializeValue, setChangeSet, setResourceAccessor, shouldExecuteChange, supportsRollback, toString, warn

Methods inherited from class liquibase.AbstractExtensibleObject

clone, describe, get, get, get, getAttributes, getFieldValue, getObjectMetaData, getValuePath, has, set

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface liquibase.ExtensibleObject

clone, describe, get, get, getAttributes, getObjectMetaData, getValuePath, has, set

Constructor Details

DropColumnChange

public DropColumnChange()

Method Details

generateStatementsVolatile

public boolean generateStatementsVolatile(Database database)

Description copied from class: AbstractChange

Implementation delegates logic to the SqlGenerator.generateStatementsIsVolatile(Database) method on the SqlStatement objects returned by Change.generateStatements(liquibase.database.Database). If zero or null SqlStatements are returned by generateStatements then this method returns false.

Specified by:

generateStatementsVolatile in interface Change

Overrides:

generateStatementsVolatile in class AbstractChange

supports

public boolean supports(Database database)

Description copied from class: AbstractChange

Implementation delegates logic to the SqlGenerator.supports(liquibase.statement.SqlStatement, liquibase.database.Database) method on the SqlStatement objects returned by Change.generateStatements(liquibase.database.Database). If no or null SqlStatements are returned by generateStatements then this method returns true. If AbstractChange.generateStatementsVolatile(liquibase.database.Database) returns true, we cannot call generateStatements and so assume true.

Specified by:

supports in interface Change

Overrides:

supports in class AbstractChange

validate

public ValidationErrors validate(Database database)

Description copied from class: AbstractChange

Implementation checks the ChangeParameterMetaData for declared required fields and also delegates logic to the SqlGenerator.validate(liquibase.statement.SqlStatement, liquibase.database.Database, liquibase.sqlgenerator.SqlGeneratorChain) method on the SqlStatement objects returned by Change.generateStatements(liquibase.database.Database). If no or null SqlStatements are returned by generateStatements then this method returns no errors. If there are no parameters than this method returns no errors

Specified by:

validate in interface Change

Overrides:

validate in class AbstractChange

getColumnName

public String getColumnName()

getCatalogName

public String getCatalogName()

getSchemaName

public String getSchemaName()

getTableName

public String getTableName()

generateStatements

public SqlStatement[] generateStatements(Database database)

Description copied from interface: Change

Generates the SqlStatement objects required to run the change for the given database.

NOTE: This method may be called multiple times throughout the changelog execution process and may be called in documentation generation and other integration points as well.

If this method reads from the current database state or uses any other logic that will be affected by whether previous changeSets have ran or not, you must return true from Change.generateStatementsVolatile(liquibase.database.Database).

Specified by:

generateStatements in interface Change

checkStatus

public ChangeStatus checkStatus(Database database)

Description copied from interface: Change

Validate that this change executed successfully against the given database. This will check that the update completed at a high level plus check details of the change. For example, a change to add a column will check that the column exists plus data type, default values, etc.

Specified by:

checkStatus in interface Change

Overrides:

checkStatus in class AbstractChange

getConfirmationMessage

public String getConfirmationMessage()

Description copied from interface: Change

Confirmation message to be displayed after the change is executed. Should include relevant configuration settings to make it as helpful as possible. This method may be called outside the changelog execution process, such as in documentation generation.

Specified by:

getConfirmationMessage in interface Change

getSerializedObjectNamespace

public String getSerializedObjectNamespace()

Specified by:

getSerializedObjectNamespace in interface LiquibaseSerializable

Overrides:

getSerializedObjectNamespace in class AbstractChange

getSerializableFieldValue

public Object getSerializableFieldValue(String field)

Specified by:

getSerializableFieldValue in interface LiquibaseSerializable

Overrides:

getSerializableFieldValue in class AbstractChange

addColumn

public void addColumn(ColumnConfig column)

Description copied from interface: ChangeWithColumns

Add a column configuration to the Change.

Specified by:

addColumn in interface ChangeWithColumns<ColumnConfig>

getColumns

public List<ColumnConfig> getColumns()

Description copied from interface: ChangeWithColumns

Return all the ColumnConfig objects defined for this Change

Specified by:

getColumns in interface ChangeWithColumns<ColumnConfig>

setColumns

public void setColumns(List<ColumnConfig> columns)

Specified by:

setColumns in interface ChangeWithColumns<ColumnConfig>