com.googlecode.flyway.core.dbsupport
Interface DbSupport

All Known Implementing Classes:

H2DbSupport, HsqlDbSupport, MySQLDbSupport, OracleDbSupport, PostgreSQLDbSupport

public interface DbSupport

Abstraction for database-specific functionality.

Method Summary

boolean	columnExists(java.lang.String table, java.lang.String column) Checks whether this column is already present in this table in the database.
SqlScript	createCleanScript() Creates a new sql script which clean the current schema, by dropping all objects.
SqlScript	createSqlScript(java.lang.String sqlScriptSource, PlaceholderReplacer placeholderReplacer) Creates a new sql script from this resource with these placeholders to replace.
java.lang.String	getBooleanFalse()
java.lang.String	getBooleanTrue()
java.lang.String	getCurrentSchema() Retrieves the current schema.
java.lang.String	getCurrentUserFunction()
java.lang.String	getScriptLocation() Returns the location on the classpath where the scripts for this database reside.
boolean	supportsDdlTransactions() Checks whether ddl transactions are supported for this database.
boolean	supportsLocking() Checks whether locking using select ... for update is supported for this database.
boolean	tableExists(java.lang.String table) Checks whether this table is already present in the database.

Method Detail

createSqlScript

SqlScript createSqlScript(java.lang.String sqlScriptSource,
                          PlaceholderReplacer placeholderReplacer)

Creates a new sql script from this resource with these placeholders to replace.

Parameters:

sqlScriptSource - The sql script as a text block with all placeholders still present.

placeholderReplacer - The placeholder replacer to apply to sql migration scripts.

Returns:

A new sql script, containing the statements from this resource, with all placeholders replaced.

Throws:

java.lang.IllegalStateException - Thrown when the script could not be read from this resource.

createCleanScript

SqlScript createCleanScript()

Creates a new sql script which clean the current schema, by dropping all objects.

Returns:

A new sql script, containing drop statements for all objects

getScriptLocation

java.lang.String getScriptLocation()

Returns the location on the classpath where the scripts for this database reside.

Returns:

The folder on the classpath, including a trailing slash.

tableExists

boolean tableExists(java.lang.String table)

Checks whether this table is already present in the database.

Parameters:

table - The table to look for.

Returns:

true if the table exists, false if it doesn't.

columnExists

boolean columnExists(java.lang.String table,
                     java.lang.String column)

Checks whether this column is already present in this table in the database.

Parameters:

table - The table to look for.

column - The column to look for.

Returns:

true if the table exists, false if it doesn't.

getCurrentSchema

java.lang.String getCurrentSchema()

Retrieves the current schema.

Returns:

The current schema for this connection.

getCurrentUserFunction

java.lang.String getCurrentUserFunction()

Returns:

The database function that returns the current user.

supportsDdlTransactions

boolean supportsDdlTransactions()

Checks whether ddl transactions are supported for this database.

Returns:

true if ddl transactions are supported, false if not.

supportsLocking

boolean supportsLocking()

Checks whether locking using select ... for update is supported for this database.

Returns:

true if locking is supported, false if not.

getBooleanTrue

java.lang.String getBooleanTrue()

Returns:

The representation of the value true in a boolean column.

getBooleanFalse

java.lang.String getBooleanFalse()

Returns:

The representation of the value false in a boolean column.