liquibase.sqlgenerator.core
Class ModifyDataTypeGenerator

java.lang.Object
  extended by liquibase.sqlgenerator.core.AbstractSqlGenerator<ModifyDataTypeStatement>
      extended by liquibase.sqlgenerator.core.ModifyDataTypeGenerator
All Implemented Interfaces:
PrioritizedService, SqlGenerator<ModifyDataTypeStatement>

public class ModifyDataTypeGenerator
extends AbstractSqlGenerator<ModifyDataTypeStatement>


Field Summary
 
Fields inherited from interface liquibase.sqlgenerator.SqlGenerator
PRIORITY_DATABASE, PRIORITY_DEFAULT
 
Fields inherited from interface liquibase.servicelocator.PrioritizedService
COMPARATOR
 
Constructor Summary
ModifyDataTypeGenerator()
           
 
Method Summary
 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? Do not validate the statement with this method, only return if it can suppot it.
 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 Detail

ModifyDataTypeGenerator

public ModifyDataTypeGenerator()
Method Detail

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 suppot 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)


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