liquibase.executor

Class LoggingExecutor

java.lang.Object

liquibase.executor.AbstractExecutor

liquibase.executor.LoggingExecutor

All Implemented Interfaces:

Executor

Direct Known Subclasses:

MockExecutor

public class LoggingExecutor
extends AbstractExecutor

A variant of the Executor service that does not actually modify the target database(s). Instead, it creates the SQL statements that would be executed. This is intended for cautious DBAs who want to examine and verify the generated changes.

Field Summary

Fields inherited from class liquibase.executor.AbstractExecutor

database

Constructor Summary

Constructors

Constructor and Description
LoggingExecutor(Executor delegatedExecutor, Writer output, Database database)

Method Summary

Modifier and Type	Method and Description
void	comment(String message) Adds a comment to the database.
void	execute(SqlStatement sql)
void	execute(SqlStatement sql, List<SqlVisitor> sqlVisitors)
protected Writer	getOutput()
int	queryForInt(SqlStatement sql) Executes a query that is expected to return a scalar (1 row, 1 column).
int	queryForInt(SqlStatement sql, List<SqlVisitor> sqlVisitors) Applies a number of SqlVisitors to the sql query.
List<Map<String,?>>	queryForList(SqlStatement sql) Executes a given SQL statement and returns a List of rows.
List	queryForList(SqlStatement sql, Class elementType)
List	queryForList(SqlStatement sql, Class elementType, List<SqlVisitor> sqlVisitors)
List<Map<String,?>>	queryForList(SqlStatement sql, List<SqlVisitor> sqlVisitors) Applies a list of SqlVisitors to the SQL query, then executes the (possibly modified) SQL query and lastly, returns the list of rows.
long	queryForLong(SqlStatement sql) Executes a query that is expected to return a scalar (1 row, 1 column).
long	queryForLong(SqlStatement sql, List<SqlVisitor> sqlVisitors) Applies a number of SqlVisitors to the sql query.
<T> T	queryForObject(SqlStatement sql, Class<T> requiredType) Execute a query that is expected to return a scalar (1 row, 1 column).
<T> T	queryForObject(SqlStatement sql, Class<T> requiredType, List<SqlVisitor> sqlVisitors) Applies a number of SqlVisitors to the sql query.
int	update(SqlStatement sql)
int	update(SqlStatement sql, List<SqlVisitor> sqlVisitors)
boolean	updatesDatabase()

Methods inherited from class liquibase.executor.AbstractExecutor

applyVisitors, execute, execute, setDatabase

Methods inherited from class java.lang.Object

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

Constructor Detail

LoggingExecutor

public LoggingExecutor(Executor delegatedExecutor,
                       Writer output,
                       Database database)

Method Detail

getOutput

protected Writer getOutput()

execute

public void execute(SqlStatement sql)
             throws DatabaseException

Throws:

DatabaseException

update

public int update(SqlStatement sql)
           throws DatabaseException

Throws:

DatabaseException

execute

public void execute(SqlStatement sql,
                    List<SqlVisitor> sqlVisitors)
             throws DatabaseException

Throws:

DatabaseException

update

public int update(SqlStatement sql,
                  List<SqlVisitor> sqlVisitors)
           throws DatabaseException

Throws:

DatabaseException

comment

public void comment(String message)
             throws DatabaseException

Description copied from interface: Executor

Adds a comment to the database. Currently does nothing but is overridden in the output JDBC template

Throws:

DatabaseException

queryForObject

public <T> T queryForObject(SqlStatement sql,
                            Class<T> requiredType)
                     throws DatabaseException

Description copied from interface: Executor

Execute a query that is expected to return a scalar (1 row, 1 column). It is expected that the scalar can be cast into an object of type T.

Parameters:

sql - The query to execute

Returns:

An object of type T, if successful. May also return null if no object is found.

Throws:

DatabaseException - in case something goes wrong during the query execution

queryForObject

public <T> T queryForObject(SqlStatement sql,
                            Class<T> requiredType,
                            List<SqlVisitor> sqlVisitors)
                     throws DatabaseException

Description copied from interface: Executor

Applies a number of SqlVisitors to the sql query. Then, executes the (possibly modified) query. The query is expected to return a scalar (1 row, 1 column). That scalar is expected to return a single value that can be cast into an object of type T.

Parameters:

sql - The query to execute

Returns:

An object of type T, if successful. May also return null if no object is found.

Throws:

DatabaseException - in case something goes wrong during the query execution

queryForLong

public long queryForLong(SqlStatement sql)
                  throws DatabaseException

Description copied from interface: Executor

Executes a query that is expected to return a scalar (1 row, 1 column). It is expected that the scalar can be cast into a long.

Parameters:

sql - The query to execute

Returns:

A long value, if successful

Throws:

DatabaseException - in case something goes wrong during the query execution

queryForLong

public long queryForLong(SqlStatement sql,
                         List<SqlVisitor> sqlVisitors)
                  throws DatabaseException

Description copied from interface: Executor

Applies a number of SqlVisitors to the sql query. Then, executes the (possibly modified) query. The query is expected to return a scalar (1 row, 1 column), and that scalar is expected to be a long value.

Parameters:

sql - The query to execute

Returns:

A long value, if successful

Throws:

DatabaseException - in case something goes wrong during the query execution

queryForInt

public int queryForInt(SqlStatement sql)
                throws DatabaseException

Description copied from interface: Executor

Executes a query that is expected to return a scalar (1 row, 1 column). It is expected that the scalar can be cast into an int.

Parameters:

sql - The query to execute

Returns:

An integer, if successful

Throws:

DatabaseException - in case something goes wrong during the query execution

queryForInt

public int queryForInt(SqlStatement sql,
                       List<SqlVisitor> sqlVisitors)
                throws DatabaseException

Description copied from interface: Executor

Applies a number of SqlVisitors to the sql query. Then, executes the (possibly modified) query. The query is expected to return a scalar (1 row, 1 column), and that scalar is expected to be an int.

Parameters:

sql - The query to execute

Returns:

An integer, if successful

Throws:

DatabaseException - in case something goes wrong during the query execution

queryForList

public List queryForList(SqlStatement sql,
                         Class elementType)
                  throws DatabaseException

Throws:

DatabaseException

queryForList

public List queryForList(SqlStatement sql,
                         Class elementType,
                         List<SqlVisitor> sqlVisitors)
                  throws DatabaseException

Throws:

DatabaseException

queryForList

public List<Map<String,?>> queryForList(SqlStatement sql)
                                 throws DatabaseException

Description copied from interface: Executor

Executes a given SQL statement and returns a List of rows. Each row is represented a a Map, where the String is the column name and the value if the content of the column in the row (=cell).

Parameters:

sql - the SQL query to execute

Returns:

a List of [Column name] -> [column value]-mapped rows.

Throws:

DatabaseException - if an error occurs during SQL processing (e.g. the SQL is not valid for the database)

queryForList

public List<Map<String,?>> queryForList(SqlStatement sql,
                                        List<SqlVisitor> sqlVisitors)
                                 throws DatabaseException

Description copied from interface: Executor

Applies a list of SqlVisitors to the SQL query, then executes the (possibly modified) SQL query and lastly, returns the list of rows. Each row is represented a a Map, where the String is the column name and the value if the content of the column in the row (=cell).

Parameters:

sql - the SQL query to execute

Returns:

a List of [Column name] -> [column value]-mapped rows.

Throws:

DatabaseException - if an error occurs during SQL processing (e.g. the SQL is not valid for the database)

updatesDatabase

public boolean updatesDatabase()