net.java.ao.db
Class SQLServerDatabaseProvider

java.lang.Object
  net.java.ao.DatabaseProvider
      net.java.ao.db.SQLServerDatabaseProvider

public class SQLServerDatabaseProvider
extends DatabaseProvider

Author:

Daniel Spiewak

Nested Class Summary

Nested classes/interfaces inherited from class net.java.ao.DatabaseProvider

DatabaseProvider.RenderFieldOptions, DatabaseProvider.SqlListener

Field Summary

Fields inherited from class net.java.ao.DatabaseProvider

logger, sqlLogger

Constructor Summary

SQLServerDatabaseProvider(DisposableDataSource dataSource)

SQLServerDatabaseProvider(DisposableDataSource dataSource, String schema)

Method Summary

protected boolean	considerPrecision(DDLField field) Determines whether or not the database allows explicit precisions for the field in question.
protected String	convertTypeToString(DatabaseType<?> type) Converts the specified type into the database-specific DDL String value.
protected Set<String>	getReservedWords() Retrieves the set of all reserved words for the underlying database.
ResultSet	getTables(Connection conn) Returns a result set of all of the tables (and associated meta) in the database.
<T> T	insertReturningKey(EntityManager manager, Connection conn, Class<T> pkType, String pkField, boolean pkIdentity, String table, DBParam... params) Generates an INSERT statement to be used to create a new row in the database, returning the primary key value.
Object	parseValue(int type, String value) Parses the database-agnostic String value relevant to the specified SQL type in int form (as defined by Types and returns the Java value which corresponds.
protected String[]	renderAlterTableAddColumn(DDLTable table, DDLField field) Generates the database-specific DDL statements required to add a column to an existing table.
protected List<String>	renderAlterTableChangeColumn(DDLTable table, DDLField oldField, DDLField field) Generates the database-specific DDL statements required to change the given column from its old specification to the given DDL value.
protected String	renderAlterTableChangeColumnStatement(DDLTable table, DDLField oldField, DDLField field, DatabaseProvider.RenderFieldOptions options) Generates the database-specific DDL statement only for altering a table and changing a column.
protected String	renderAlterTableDropKey(DDLForeignKey key) Generates the database-specific DDL statement required to remove a foreign key from a table.
protected String	renderAutoIncrement() Generates the DDL fragment required to specify an INTEGER field as auto-incremented.
protected String	renderFieldDefault(DDLTable table, DDLField field)
protected DatabaseProvider.RenderFieldOptions	renderFieldOptionsInAlterColumn()
protected String	renderFieldPrecision(DDLField field) Renders the statement fragment for the given field representative of its precision only.
protected String	renderFunction(DatabaseFunction func) Renders the specified DatabaseFunction in its database-specific form.
protected String	renderOnUpdate(DDLField field) Renders the appropriate field suffix to allow for the OnUpdate functionality.
protected String	renderQueryLimit(Query query) Renders the LIMIT portion of the query in the database-specific SQL dialect.
protected String	renderQuerySelect(Query query, TableNameConverter converter, boolean count) Renders the SELECT portion of a given Query instance in the manner required by the database-specific SQL implementation.
protected String	renderTriggerForField(DDLTable table, DDLField field) Renders the trigger which corresponds to the specified field, or null if none.
void	setQueryResultSetProperties(ResultSet res, Query query) Allows the provider to set database-specific options on a ResultSet instance prior to its use by the library.

Methods inherited from class net.java.ao.DatabaseProvider

addSqlListener, dispose, executeInsertReturningKey, executeUpdate, getConnection, getDateFormat, getFunctionNameForField, getImportedKeys, getMaxIDLength, getSchema, getSequences, getTriggerNameForField, handleBlob, handleUpdateError, isCaseSensetive, isNumericType, isSchemaNotEmpty, onSql, preparedStatement, preparedStatement, preparedStatement, processID, processOnClause, processWhereClause, putBoolean, putNull, quote, removeSqlListener, renderAction, renderAlterTableAddKey, renderAlterTableDropColumn, renderAppend, renderCalendar, renderConstraintsForTable, renderCreateIndex, renderDropFunctions, renderDropIndex, renderDropSequences, renderDropTable, renderDropTriggers, renderField, renderFieldType, renderForeignKey, renderFunctionForField, renderFunctions, renderInsert, renderQuery, renderQueryGroupBy, renderQueryJoins, renderQueryOrderBy, renderQueryWhere, renderSequences, renderTable, renderTriggers, renderUnique, renderValue, setPostConnectionProperties, setQueryStatementProperties, shorten, shouldQuoteID, withSchema

Methods inherited from class java.lang.Object

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

Constructor Detail

SQLServerDatabaseProvider

public SQLServerDatabaseProvider(DisposableDataSource dataSource)

SQLServerDatabaseProvider

public SQLServerDatabaseProvider(DisposableDataSource dataSource,
                                 String schema)

Method Detail

setQueryResultSetProperties

public void setQueryResultSetProperties(ResultSet res,
                                        Query query)
                                 throws SQLException

Description copied from class: DatabaseProvider

Allows the provider to set database-specific options on a ResultSet instance prior to its use by the library. This allows for features such as row offsetting even on databases that don't support it (such as Oracle, Derby, etc).

Overrides:

setQueryResultSetProperties in class DatabaseProvider

Parameters:

res - The ResultSet to modify.

query - The query instance which was run to produce the result set.

Throws:

SQLException

getTables

public ResultSet getTables(Connection conn)
                    throws SQLException

Description copied from class: DatabaseProvider

Returns a result set of all of the tables (and associated meta) in the database. The fields of the result set must correspond with those specified in the DatabaseMetaData#getTables(String, String, String, String[]) method. In fact, the default implementation merely calls this method passing (null, null, "", null). For databases (such as PostgreSQL) where this is unsuitable, different parameters can be specified to the getTables method in the override, or an entirely new implementation written, as long as the result set corresponds in fields to the JDBC spec.

Overrides:

getTables in class DatabaseProvider

Parameters:

conn - The connection to use in retrieving the database tables.

Returns:

A result set of tables (and meta) corresponding in fields to the JDBC specification.

Throws:

SQLException

See Also:

DatabaseMetaData.getTables(String, String, String, String[])

parseValue

public Object parseValue(int type,
                         String value)

Description copied from class: DatabaseProvider

Parses the database-agnostic String value relevant to the specified SQL type in int form (as defined by Types and returns the Java value which corresponds. This method is completely database-agnostic, as are all of all of its delegate methods.

WARNING: This method is being considered for removal to another class (perhaps TypeManager?) as it is not a database-specific function and thus confuses the purpose of this class. Do not rely upon it heavily. (better yet, don't rely on it at all from external code. It's not designed to be part of the public API)

Overrides:

parseValue in class DatabaseProvider

Parameters:

type - The JDBC integer type of the database field against which to parse the value.

value - The database-agnostic String value to parse into a proper Java object with respect to the specified SQL type.

Returns:

A Java value which corresponds to the specified String.

renderAlterTableChangeColumn

protected List<String> renderAlterTableChangeColumn(DDLTable table,
                                                    DDLField oldField,
                                                    DDLField field)

Description copied from class: DatabaseProvider

Generates the database-specific DDL statements required to change the given column from its old specification to the given DDL value. This method will also generate the appropriate statements to remove old triggers and functions, as well as add new ones according to the requirements of the new field definition.

The default implementation of this method functions in the manner specified by the MySQL database. Some databases will have to perform more complicated actions (such as dropping and re-adding the field) in order to satesfy the same use-case. Such databases should print a warning to stderr to ensure that the end-developer is aware of such restrictions.

Thus, the specification for this method allows for data loss. Nevertheless, if the database supplies a mechanism to accomplish the task without data loss, it should be applied.

For maximum flexibility, the default implementation of this method only deals with the dropping and addition of functions and triggers. The actual generation of the ALTER TABLE statement is done in the #renderAlterTableChangeColumnStatement(net.java.ao.schema.ddl.DDLTable, net.java.ao.schema.ddl.DDLField, net.java.ao.schema.ddl.DDLField, boolean) method.

Overrides:

renderAlterTableChangeColumn in class DatabaseProvider

Parameters:

table - The table containing the column to change.

oldField - The old column definition.

field - The new column definition (defining the resultant DDL).

Returns:

An array of DDL statements to be executed.

See Also:

DatabaseProvider.getTriggerNameForField(DDLTable, DDLField), DatabaseProvider.getFunctionNameForField(DDLTable, DDLField), DatabaseProvider.renderFunctionForField(DDLTable, DDLField), DatabaseProvider.renderTriggerForField(DDLTable, DDLField)

renderFieldOptionsInAlterColumn

protected DatabaseProvider.RenderFieldOptions renderFieldOptionsInAlterColumn()

Overrides:

renderFieldOptionsInAlterColumn in class DatabaseProvider

renderQuerySelect

protected String renderQuerySelect(Query query,
                                   TableNameConverter converter,
                                   boolean count)

Description copied from class: DatabaseProvider

Renders the SELECT portion of a given Query instance in the manner required by the database-specific SQL implementation. Usually, this is as simple as "SELECT id FROM table" or "SELECT DISTINCT * FROM table". However, some databases require the limit and offset parameters to be specified as part of the SELECT clause. For example, on HSQLDB, a Query for the "id" field limited to 10 rows would render SELECT like this: SELECT TOP 10 id FROM table.

There is usually no need to call this method directly. Under normal operations it functions as a delegate for DatabaseProvider.renderQuery(Query, TableNameConverter, boolean).

Overrides:

renderQuerySelect in class DatabaseProvider

Parameters:

query - The Query instance from which to determine the SELECT properties.

converter - The name converter to allow conversion of the query entity interface into a proper table name.

count - Whether or not the query should be rendered as a SELECT COUNT(*).

Returns:

The database-specific SQL rendering of the SELECT portion of the query.

renderQueryLimit

protected String renderQueryLimit(Query query)

Description copied from class: DatabaseProvider

Renders the LIMIT portion of the query in the database-specific SQL dialect. There is wide variety in database implementations of this particular SQL clause. In fact, many database do not support it at all. If the database in question does not support LIMIT, this method should be overridden to return an empty String. For such databases, LIMIT should be implemented by overriding DatabaseProvider.setQueryResultSetProperties(ResultSet, Query) and DatabaseProvider.setQueryStatementProperties(Statement, Query).

An example return value: " LIMIT 10,2"

There is usually no need to call this method directly. Under normal operations it functions as a delegate for DatabaseProvider.renderQuery(Query, TableNameConverter, boolean).

Overrides:

renderQueryLimit in class DatabaseProvider

Parameters:

query - The Query instance from which to determine the LIMIT properties.

Returns:

The database-specific SQL rendering of the LIMIT portion of the query.

renderAutoIncrement

protected String renderAutoIncrement()

Description copied from class: DatabaseProvider

Generates the DDL fragment required to specify an INTEGER field as auto-incremented. For databases which do not support such flags (which is just about every database exception MySQL), "" is an acceptable return value. This method should never return null as it would cause the field rendering method to throw a NullPointerException.

Overrides:

renderAutoIncrement in class DatabaseProvider

renderOnUpdate

protected String renderOnUpdate(DDLField field)

Description copied from class: DatabaseProvider

Renders the appropriate field suffix to allow for the OnUpdate functionality. For most databases (read: all but MySQL) this will return an empty String. This is because few databases provide an implicit ON UPDATE syntax for fields. As such, most databases will be compelled to return an empty String and implement the functionality using triggers.

Overrides:

renderOnUpdate in class DatabaseProvider

Parameters:

field - The field for which the ON UPDATE clause should be rendered.

Returns:

The database-specific ON UPDATE field clause.

convertTypeToString

protected String convertTypeToString(DatabaseType<?> type)

Description copied from class: DatabaseProvider

Converts the specified type into the database-specific DDL String value. By default, this delegates to the DatabaseType#getDefaultName() method. Subclass implementations should be sure to make a super call in order to ensure that both default naming and future special cases are handled appropriately.

Overrides:

convertTypeToString in class DatabaseProvider

Parameters:

type - The type instance to convert to a DDL string.

Returns:

The database-specific DDL representation of the type (e.g. "VARCHAR").

See Also:

DatabaseType.getDefaultName()

considerPrecision

protected boolean considerPrecision(DDLField field)

Description copied from class: DatabaseProvider

Determines whether or not the database allows explicit precisions for the field in question. This is to support databases such as Derby which do not support precisions for certain types. By default, this method returns true.

More often than not, all that is required for this determination is the type. As such, the method signature may change in a future release.

Overrides:

considerPrecision in class DatabaseProvider

Parameters:

field - The field for which precision should/shouldn't be rendered.

Returns:

true if precision should be rendered, otherwise false.

renderFieldDefault

protected String renderFieldDefault(DDLTable table,
                                    DDLField field)

Overrides:

renderFieldDefault in class DatabaseProvider

renderFieldPrecision

protected String renderFieldPrecision(DDLField field)

Description copied from class: DatabaseProvider

Renders the statement fragment for the given field representative of its precision only. Consider the following statement:

ALTER TABLE ADD COLUMN name VARCHAR(255)

In this statement, the bit which is rendered by this method is the "(255)" (without quotes). This is intended to allow maximum flexibility in field type rendering (as required by PostgreSQL and others which sometimes render types separately from the rest of the field info). The default implementation should suffice for every conceivable database. Any sort of odd functionality relating to type precision rendering should be handled in the DatabaseProvider.considerPrecision(DDLField) method if possible.

Overrides:

renderFieldPrecision in class DatabaseProvider

Parameters:

field - The field for which the precision must be rendered.

Returns:

A DDL fragment which will be concatenated into a statement later.

renderFunction

protected String renderFunction(DatabaseFunction func)

Description copied from class: DatabaseProvider

Renders the specified DatabaseFunction in its database-specific form. For example, for MySQL the CURRENT_DATE enum value would be rendered as "CURRENT_DATE" (without the quotes). For functions which do not have a database equivalent, a default literal value of the appropriate type should be returned. For example, if MySQL did not define either a CURRENT_DATE or a CURRENT_TIMESTAMP function, the appropriate return value for both functions would be '0000-00-00 00:00:00' (including the quotes). This is to prevent migrations from failing even in cases where non-standard functions are used.

As of 1.0, no unconventional functions are allowed by the DatabaseFunction enum, thus no database should have any problems with any allowed functions.

Overrides:

renderFunction in class DatabaseProvider

Parameters:

func - The abstract function to be rendered.

Returns:

The database-specific DDL representation of the function in question.

renderTriggerForField

protected String renderTriggerForField(DDLTable table,
                                       DDLField field)

Description copied from class: DatabaseProvider

Renders the trigger which corresponds to the specified field, or null if none. This is to allow for databases which require the use of triggers to provide functionality such as ON UPDATE. The default implementation returns null.

Overrides:

renderTriggerForField in class DatabaseProvider

Parameters:

table - The table containing the field for which a trigger may need to be rendered.

field - The field for which the trigger should be rendered, if any.

Returns:

A database-specific DDL statement creating a trigger for the field in question, or null.

See Also:

DatabaseProvider.getTriggerNameForField(DDLTable, DDLField)

renderAlterTableChangeColumnStatement

protected String renderAlterTableChangeColumnStatement(DDLTable table,
                                                       DDLField oldField,
                                                       DDLField field,
                                                       DatabaseProvider.RenderFieldOptions options)

Description copied from class: DatabaseProvider

Generates the database-specific DDL statement only for altering a table and changing a column. This method must only generate a single statement as it does not need to concern itself with functions or triggers associated with the column. This method is only to be called as a delegate for the DatabaseProvider.renderAlterTableChangeColumn(DDLTable, DDLField, DDLField) method, for which it is a primary delegate. The default implementation of this method functions according to the MySQL specification.

Overrides:

renderAlterTableChangeColumnStatement in class DatabaseProvider

Parameters:

table - The table containing the column to change.

oldField - The old column definition.

field - The new column definition (defining the resultant DDL).

Returns:

A single DDL statement which is to be executed.

See Also:

DatabaseProvider.renderField(net.java.ao.schema.ddl.DDLTable, net.java.ao.schema.ddl.DDLField, DatabaseProvider.RenderFieldOptions)

renderAlterTableAddColumn

protected String[] renderAlterTableAddColumn(DDLTable table,
                                             DDLField field)

Description copied from class: DatabaseProvider

Generates the database-specific DDL statements required to add a column to an existing table. Included in the return value should be the statements required to add all necessary functions and triggers to ensure that the column acts appropriately. For example, if the field is tagged with an @OnUpdate annotation, chances are there will be a trigger and possibly a function along with the ALTER statement. These "extra" functions are properly ordered and will only be appended if their values are not null. Because of this, very few database providers will need to override this method.

Overrides:

renderAlterTableAddColumn in class DatabaseProvider

Parameters:

table - The table which should receive the new column.

field - The column to add to the specified table.

Returns:

An array of DDL statements to execute.

See Also:

DatabaseProvider.renderFunctionForField(DDLTable, DDLField), DatabaseProvider.renderTriggerForField(DDLTable, DDLField)

renderAlterTableDropKey

protected String renderAlterTableDropKey(DDLForeignKey key)

Description copied from class: DatabaseProvider

Generates the database-specific DDL statement required to remove a foreign key from a table. For databases which do not support such a statement, a warning should be printed to stderr and a null value returned. This method assumes that the DatabaseProvider.renderForeignKey(DDLForeignKey) method properly names the foreign key according to the DDLForeignKey.getFKName() method.

Overrides:

renderAlterTableDropKey in class DatabaseProvider

Parameters:

key - The foreign key to be removed. As this instance contains all necessary data (such as domestic table, field, etc), no additional parameters are required.

Returns:

A DDL statement to be executed, or null.

insertReturningKey

public <T> T insertReturningKey(EntityManager manager,
                                Connection conn,
                                Class<T> pkType,
                                String pkField,
                                boolean pkIdentity,
                                String table,
                                DBParam... params)
                     throws SQLException

Description copied from class: DatabaseProvider

Generates an INSERT statement to be used to create a new row in the database, returning the primary key value. This method also invokes the delegate method, DatabaseProvider.executeInsertReturningKey(EntityManager, java.sql.Connection, Class, String, String, DBParam...) passing the appropriate parameters and query. This method is required because some databases do not support the JDBC parameter RETURN_GENERATED_KEYS (such as HSQLDB and PostgreSQL). Also, some databases (such as MS SQL Server) require odd tricks to support explicit value passing to auto-generated fields. This method should take care of any extra queries or odd SQL generation required to implement both auto-generated primary key returning, as well as explicit primary key value definition.

Overriding implementations of this method should be sure to use the Connection instance passed to the method, not a new instance generated using the DatabaseProvider.getConnection() method. This is because this method is in fact a delegate invoked by EntityManager as part of the entity creation process and may be part of a transaction, a bulk creation or some more complicated operation. Both optimization and usage patterns on the API dictate that the specified connection instance be used. Implementations may assume that the given connection instance is never null.

The default implementation of this method should be sufficient for any fully compliant ANSI SQL database with a properly implemented JDBC driver. Note that this method should not not actually execute the SQL it generates, but pass it on to the DatabaseProvider.executeInsertReturningKey(EntityManager, java.sql.Connection, Class, String, String, DBParam...) method, allowing for functional delegation and better extensibility. However, this method may execute any additional statements required to prepare for the INSERTion (as in the case of MS SQL Server which requires some config parameters to be set on the database itself prior to INSERT).

Overrides:

insertReturningKey in class DatabaseProvider

Parameters:

manager - The EntityManager which was used to dispatch the INSERT in question.

conn - The connection to be used in the eventual execution of the generated SQL statement.

pkType - The Java type of the primary key value. Can be used to perform a linear search for a specified primary key value in the params list. The return value of the method must be of the same type.

pkField - The database field which is the primary key for the table in question. Can be used to perform a linear search for a specified primary key value in the params list.

pkIdentity - Flag indicating whether or not the primary key field is auto-incremented by the database (IDENTITY field).

table - The name of the table into which the row is to be INSERTed.

params - A varargs array of parameters to be passed to the INSERT statement. This may include a specified value for the primary key.

Throws:

SQLException - If the INSERT fails in the delegate method, or if any additional statements fail with an exception.

See Also:

DatabaseProvider.executeInsertReturningKey(EntityManager, java.sql.Connection, Class, String, String, DBParam...)

getReservedWords

protected Set<String> getReservedWords()

Description copied from class: DatabaseProvider

Retrieves the set of all reserved words for the underlying database. The set returns should be speculative, meaning that it should include any possible reserved words, not just those for a particular version. As an implementation guideline, the Set instance returned from this method should guarentee O(1) lookup times, otherwise ORM performance will suffer greatly.

Specified by:

getReservedWords in class DatabaseProvider

Returns:

A set of upper case reserved words specific to the database.