Package liquibase.sqlgenerator.core

Class ModifyDataTypeGenerator

java.lang.Object

liquibase.sqlgenerator.core.AbstractSqlGenerator<ModifyDataTypeStatement>

liquibase.sqlgenerator.core.ModifyDataTypeGenerator

All Implemented Interfaces:

PrioritizedService, SqlGenerator<ModifyDataTypeStatement>

public class ModifyDataTypeGenerator
extends AbstractSqlGenerator<ModifyDataTypeStatement>

Field Summary

Fields inherited from interface liquibase.servicelocator.PrioritizedService

COMPARATOR

Fields inherited from interface liquibase.sqlgenerator.SqlGenerator

EMPTY_SQL, PRIORITY_DATABASE, PRIORITY_DEFAULT

Constructor Summary

Constructors

Constructor	Description
ModifyDataTypeGenerator()

Method Summary

Modifier and Type	Method	Description
Sql[]	generateSql(ModifyDataTypeStatement statement, Database database, SqlGeneratorChain sqlGeneratorChain)	Generate the actual Sql for the given statement and database.
protected Relation	getAffectedTable(ModifyDataTypeStatement statement)
protected String	getModifyString(Database database)
protected String	getPreDataTypeString(Database database)
boolean	supports(ModifyDataTypeStatement statement, Database database)	Does this generator support the given statement/database combination?
ValidationErrors	validate(ModifyDataTypeStatement statement, Database database, SqlGeneratorChain sqlGeneratorChain)	Validate the data contained in the SqlStatement.
Warnings	warn(ModifyDataTypeStatement modifyDataTypeStatement, Database database, SqlGeneratorChain sqlGeneratorChain)

Methods inherited from class liquibase.sqlgenerator.core.AbstractSqlGenerator

generateRollbackStatementsIsVolatile, generateStatementsIsVolatile, getPriority, looksLikeFunctionCall

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ModifyDataTypeGenerator

public ModifyDataTypeGenerator()

Method Details

supports

public boolean supports(ModifyDataTypeStatement statement,
 Database database)

Description copied from interface: SqlGenerator

Does this generator support the given statement/database combination? Do not validate the statement with this method, only return if it can support it.

Specified by:

supports in interface SqlGenerator<ModifyDataTypeStatement>

Overrides:

supports in class AbstractSqlGenerator<ModifyDataTypeStatement>

warn

public Warnings warn(ModifyDataTypeStatement modifyDataTypeStatement,
 Database database,
 SqlGeneratorChain sqlGeneratorChain)

Specified by:

warn in interface SqlGenerator<ModifyDataTypeStatement>

Overrides:

warn in class AbstractSqlGenerator<ModifyDataTypeStatement>

validate

public ValidationErrors validate(ModifyDataTypeStatement statement,
 Database database,
 SqlGeneratorChain sqlGeneratorChain)

Description copied from interface: SqlGenerator

Validate the data contained in the SqlStatement. If there are no errors, return an empty ValidationErrors object, not a null value. Liquibase will inspect the ValidationErrors result before attempting to call generateSql.

generateSql

public Sql[] generateSql(ModifyDataTypeStatement statement,
 Database database,
 SqlGeneratorChain sqlGeneratorChain)

Description copied from interface: SqlGenerator

Generate the actual Sql for the given statement and database.

getAffectedTable

protected Relation getAffectedTable(ModifyDataTypeStatement statement)

getModifyString

protected String getModifyString(Database database)

Returns:

either "MODIFY" or "ALTER COLUMN" depending on the current db

getPreDataTypeString

protected String getPreDataTypeString(Database database)

Returns:

the string that comes before the column type definition (like 'set data type' for derby or an open parentheses for Oracle)