org.geotools.data.sqlserver

Class SQLServerDialect

Object

SQLDialect

BasicSQLDialect

SQLServerDialect

Direct Known Subclasses:

JTDSSQLServerDialect

public class SQLServerDialect
extends BasicSQLDialect

Dialect implementation for Microsoft SQL Server.

Author:

Justin Deoliveira, OpenGEO

Field Summary

Fields inherited from class SQLDialect

BASE_DBMS_CAPABILITIES, dataStore, LOGGER

Constructor Summary

Constructors

Constructor and Description
SQLServerDialect(JDBCDataStore dataStore)

Method Summary

Modifier and Type	Method and Description
void	applyLimitOffset(StringBuffer sql, int limit, int offset) Alters the query provided so that limit and offset are natively dealt with.
FilterToSQL	createFilterToSQL() Creates the filter encoder to be used by the datastore when encoding query predicates.
Envelope	decodeGeometryEnvelope(ResultSet rs, int column, Connection cx) Decodes the result of a spatial extent function in a SELECT statement.
Geometry	decodeGeometryValue(GeometryDescriptor descriptor, ResultSet rs, String column, GeometryFactory factory, Connection cx, Hints hints) Decodes a geometry value from the result of a query.
void	dropIndex(Connection cx, SimpleFeatureType schema, String databaseSchema, String indexName) Drop the index.
void	encodeGeometryColumn(GeometryDescriptor gatt, String prefix, int srid, Hints hints, StringBuffer sql) Encodes the name of a geometry column in a SELECT statement.
void	encodeGeometryEnvelope(String tableName, String geometryColumn, StringBuffer sql) Encodes the spatial extent function of a geometry column in a SELECT statement.
void	encodeGeometryValue(Geometry value, int dimension, int srid, StringBuffer sql) Encodes a geometry value in an sql statement.
protected void	encodeTableName(String schemaName, String tableName, StringBuffer sql, boolean escape)
void	encodeValue(Object value, Class type, StringBuffer sql) Encodes a value in an sql statement.
int	getGeometryDimension(String schemaName, String tableName, String columnName, Connection cx) Returns the dimension of the coordinates in the geometry.
Integer	getGeometryDimensionFromMetadataTable(String schemaName, String tableName, String columnName, Connection cx)
String	getGeometryMetadataTable() The geometry metadata table in use, if any
Integer	getGeometrySRID(String schemaName, String tableName, String columnName, Connection cx) Returns the spatial reference system identifier (srid) for a particular geometry column.
Integer	getGeometrySRIDfromMetadataTable(String schemaName, String tableName, String columnName, Connection cx)
String	getGeometryTypeName(Integer type) Returns the name of a geometric type based on its integer constant.
Object	getLastAutoGeneratedValue(String schemaName, String tableName, String columnName, Connection cx, Statement st) Obtains the last value of an auto generated column.
Class<?>	getMapping(ResultSet columnMetaData, Connection cx) Determines the class mapping for a particular column of a table.
void	handleSelectHints(StringBuffer sql, SimpleFeatureType featureType, Query query) Used to apply search hints on the fully generated SQL (complete of select, from, where, sort, limit/offset)
boolean	includeTable(String schemaName, String tableName, Connection cx) Determines if the specified table should be included in those published by the datastore.
boolean	isLimitOffsetSupported() Returns true if this dialect can encode both Query.getStartIndex() and Query.getMaxFeatures() into native SQL.
boolean	lookupGeneratedValuesPostInsert() Controls whether keys are looked up post or pre insert.
void	postCreateFeatureType(SimpleFeatureType featureType, DatabaseMetaData md, String databaseSchema, Connection cx) Callback which executes after a feature type has been built from a database table.
void	postCreateTable(String schemaName, SimpleFeatureType featureType, Connection cx) Callback to execute any additional sql statements post a create table statement.
void	registerAggregateFunctions(Map<Class<? extends FeatureVisitor>,String> aggregates) Registers the set of aggregate functions the dialect is capable of handling.
void	registerClassToSqlMappings(Map<Class<?>,Integer> mappings) Registers the java type to sql type mappings that the datastore uses when reading and writing objects to and from the database. * Subclasses should extend (not override) this method to provide additional mappings, or to override mappings provided by this implementation.
void	registerSqlTypeNameToClassMappings(Map<String,Class<?>> mappings) Registers the sql type name to java type mappings that the dialect uses when reading and writing objects to and from the database.
void	registerSqlTypeToSqlTypeNameOverrides(Map<Integer,String> overrides) Registers any overrides that should occur when mapping an integer sql type value to an underlying sql type name.
void	setForceSpatialIndexes(boolean forceSpatialIndexes) Sets whether to force the usage of spatial indexes by including a WITH INDEX hint
void	setGeometryMetadataTable(String geometryMetadataTable) Sets the geometry metadata table
void	setTableHints(String tableHints) Sets a comma separated list of table hints that will be added to every select query
void	setUseNativeSerialization(Boolean useNativeSerialization) Sets whether to use native SQL Server binary serialization or WKB serialization
void	setUseOffSetLimit(Boolean useOffsetLimit) Sets whether to use offset limit or not

Methods inherited from class BasicSQLDialect

onDelete, onInsert, onSelect, onUpdate

Methods inherited from class SQLDialect

addSupportedHints, canSimplifyPoints, convertValue, createCRS, createIndex, decodeGeometryValue, encodeColumnAlias, encodeColumnName, encodeColumnType, encodeCreateTable, encodeGeometryColumnGeneralized, encodeGeometryColumnSimplified, encodeJoin, encodeNextSequenceValue, encodePostColumnCreateTable, encodePostCreateTable, encodePostSelect, encodePrimaryKey, encodeSchemaName, encodeTableAlias, encodeTableName, escapeName, getAggregateConverter, getDefaultVarcharSize, getDesiredTablesType, getIndexes, getLastAutoGeneratedValue, getNameEscape, getNextAutoGeneratedValue, getNextSequenceValue, getOptimizedBounds, getPkColumnValue, getPrimaryKey, getRestrictions, getResultTypes, getSequenceForColumn, getSQLType, handleUserDefinedType, initializeConnection, isAggregatedSortSupported, isArray, isAutoCommitQuery, isGroupBySupported, ne, postCreateAttribute, postDropTable, preDropTable, registerSqlTypeToClassMappings, splitFilter, supportsSchemaForIndex

Methods inherited from class Object

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

Constructor Detail

SQLServerDialect

public SQLServerDialect(JDBCDataStore dataStore)

Method Detail

includeTable

public boolean includeTable(String schemaName,
                            String tableName,
                            Connection cx)
                     throws SQLException

Description copied from class: SQLDialect

Determines if the specified table should be included in those published by the datastore.

This method returns true if the table should be published as a feature type, otherwise it returns false. Subclasses should override this method, this default implementation returns true.

A database connection is provided to the dialect but it should not be closed. However any statements objects or result sets that are instantiated from it must be closed.

Overrides:

includeTable in class SQLDialect

Parameters:

schemaName - The schema of the table, might be null..

tableName - The name of the table.

cx - Database connection.

Throws:

SQLException

getGeometryTypeName

public String getGeometryTypeName(Integer type)

Description copied from class: SQLDialect

Returns the name of a geometric type based on its integer constant.

The constant, type, is registered in SQLDialect.registerSqlTypeNameToClassMappings(Map).

This default implementation returns null, subclasses should override.

Overrides:

getGeometryTypeName in class SQLDialect

registerClassToSqlMappings

public void registerClassToSqlMappings(Map<Class<?>,Integer> mappings)

Description copied from class: SQLDialect

Registers the java type to sql type mappings that the datastore uses when reading and writing objects to and from the database. *

Subclasses should extend (not override) this method to provide additional mappings, or to override mappings provided by this implementation. This implementation provides the following mappings:

Overrides:

registerClassToSqlMappings in class SQLDialect

registerSqlTypeNameToClassMappings

public void registerSqlTypeNameToClassMappings(Map<String,Class<?>> mappings)

Description copied from class: SQLDialect

Registers the sql type name to java type mappings that the dialect uses when reading and writing objects to and from the database.

Subclasses should extend (not override) this method to provide additional mappings, or to override mappings provided by this implementation. This implementation provides the following mappings:

Overrides:

registerSqlTypeNameToClassMappings in class SQLDialect

registerSqlTypeToSqlTypeNameOverrides

public void registerSqlTypeToSqlTypeNameOverrides(Map<Integer,String> overrides)

Description copied from class: SQLDialect

Registers any overrides that should occur when mapping an integer sql type value to an underlying sql type name.

The default implementation of this method does nothing. Subclasses should override in cases where:

• database type metadata does not provide enough information to properly map
• to support custom types (those not in Types)

Overrides:

registerSqlTypeToSqlTypeNameOverrides in class SQLDialect

postCreateTable

public void postCreateTable(String schemaName,
                            SimpleFeatureType featureType,
                            Connection cx)
                     throws SQLException,
                            IOException

Description copied from class: SQLDialect

Callback to execute any additional sql statements post a create table statement.

This method should be implemented by subclasses that need to do some post processing on the database after a table has been created. Examples might include:

• Creating a sequence for a primary key
• Registering geometry column metadata
• Creating a spatial index

A common case is creating an auto incrementing sequence for the primary key of a table. It should be noted that all tables created through the datastore use the column "fid" as the primary key.

A direct connection to the database is provided (cx). This connection must not be closed, however any statements or result sets instantiated from the connection must be closed.

Overrides:

postCreateTable in class SQLDialect

Parameters:

schemaName - The name of the schema, may be null.

featureType - The feature type that has just been created on the database.

cx - Database connection.

Throws:

SQLException

IOException

getMapping

public Class<?> getMapping(ResultSet columnMetaData,
                           Connection cx)
                    throws SQLException

Description copied from class: SQLDialect

Determines the class mapping for a particular column of a table.

Implementing this method is optional. It is used to allow database to perform custom type mappings based on various column metadata. It is called before the mappings registered in SQLDialect.registerSqlTypeToClassMappings(Map) and #registerSqlTypeNameToClassMappings(Map) are used to determine the mapping. Subclasses should implement as needed, this default implementation returns null.

The columnMetaData argument is provided from {@link DatabaseMetaData#getColumns(String, String, String, String)}.

Overrides:

getMapping in class SQLDialect

Parameters:

columnMetaData - The column metadata

cx - The connection used to retrieve the metadata

Returns:

The class mapped to the to column, or null.

Throws:

SQLException

getGeometrySRIDfromMetadataTable

public Integer getGeometrySRIDfromMetadataTable(String schemaName,
                                                String tableName,
                                                String columnName,
                                                Connection cx)
                                         throws SQLException

Throws:

SQLException

getGeometrySRID

public Integer getGeometrySRID(String schemaName,
                               String tableName,
                               String columnName,
                               Connection cx)
                        throws SQLException

Description copied from class: SQLDialect

Returns the spatial reference system identifier (srid) for a particular geometry column.

This method is given a direct connection to the database. The connection must not be closed. However any statements or result sets instantiated from the connection must be closed.

In the event that the srid cannot be determined, this method should return null .

Overrides:

getGeometrySRID in class SQLDialect

Parameters:

schemaName - The database schema, could be null.

tableName - The table, never null.

columnName - The column name, never null

cx - The database connection.

Throws:

SQLException

getGeometryDimensionFromMetadataTable

public Integer getGeometryDimensionFromMetadataTable(String schemaName,
                                                     String tableName,
                                                     String columnName,
                                                     Connection cx)
                                              throws SQLException

Throws:

SQLException

getGeometryDimension

public int getGeometryDimension(String schemaName,
                                String tableName,
                                String columnName,
                                Connection cx)
                         throws SQLException

Description copied from class: SQLDialect

Returns the dimension of the coordinates in the geometry. Defaults to 2, subclasses can override it.

This method is given a direct connection to the database. The connection must not be closed. However any statements or result sets instantiated from the connection must be closed.

In the event that the dimension cannot be determined, this method should return 2

Overrides:

getGeometryDimension in class SQLDialect

Parameters:

schemaName - The database schema, could be null.

tableName - The table, never null.

columnName - The column name, never null

cx - The database connection.

Throws:

SQLException

encodeGeometryColumn

public void encodeGeometryColumn(GeometryDescriptor gatt,
                                 String prefix,
                                 int srid,
                                 Hints hints,
                                 StringBuffer sql)

Description copied from class: SQLDialect

Encodes the name of a geometry column in a SELECT statement.

This method should wrap the column name in any functions that are used to retrieve its value. For instance, often it is necessary to use the function asText, or asWKB when fetching a geometry.

This method must also be sure to properly encode the name of the column with the SQLDialect.encodeColumnName(String, String, StringBuffer) function.

Example:

   
   sql.append( "asText(" );
   column( gatt.getLocalName(), sql );
   sql.append( ")" );
   
 

Overrides:

encodeGeometryColumn in class SQLDialect

encodeGeometryValue

public void encodeGeometryValue(Geometry value,
                                int dimension,
                                int srid,
                                StringBuffer sql)
                         throws IOException

Description copied from class: BasicSQLDialect

Encodes a geometry value in an sql statement.

An implementations should serialize value into some exchange format which will then be transported to the underlying database. For example, consider an implementation which converts a geometry into its well known text representation:

   
   sql.append( "GeomFromText('" );
   sql.append( new WKTWriter().write( value ) );
   sql.append( ")" );
   
  

The srid parameter is the spatial reference system identifier of the geometry, or 0 if not known.

Attention should be paid to emtpy geometries (g.isEmtpy() == true) as they cannot be encoded in WKB and several databases fail to handle them property. Common treatment is to equate them to NULL

Specified by:

encodeGeometryValue in class BasicSQLDialect

Throws:

IOException

decodeGeometryValue

public Geometry decodeGeometryValue(GeometryDescriptor descriptor,
                                    ResultSet rs,
                                    String column,
                                    GeometryFactory factory,
                                    Connection cx,
                                    Hints hints)
                             throws IOException,
                                    SQLException

Description copied from class: SQLDialect

Decodes a geometry value from the result of a query.

This method is given direct access to a result set. The column parameter is the index into the result set which contains the geometric value.

An implementation should deserialize the value provided by the result set into Geometry object. For example, consider an implementation which deserializes from well known text:

   String wkt = rs.getString( column );
   if ( wkt == null ) {
     return null;
   }
   return new WKTReader(factory).read( wkt );
   

Note that implementations must handle null values.

The factory parameter should be used to instantiate any geometry objects.

Specified by:

decodeGeometryValue in class SQLDialect

Throws:

IOException

SQLException

encodeGeometryEnvelope

public void encodeGeometryEnvelope(String tableName,
                                   String geometryColumn,
                                   StringBuffer sql)

Description copied from class: SQLDialect

Encodes the spatial extent function of a geometry column in a SELECT statement.

This method must also be sure to properly encode the name of the column with the #encodeColumnName(String, StringBuffer) function.

Specified by:

encodeGeometryEnvelope in class SQLDialect

decodeGeometryEnvelope

public Envelope decodeGeometryEnvelope(ResultSet rs,
                                       int column,
                                       Connection cx)
                                throws SQLException,
                                       IOException

Description copied from class: SQLDialect

Decodes the result of a spatial extent function in a SELECT statement.

This method is given direct access to a result set. The column parameter is the index into the result set which contains the spatial extent value. The query for this value is build with the SQLDialect.encodeGeometryEnvelope(String, String, StringBuffer) method.

This method must not read any other objects from the result set other then the one referenced by column.

Specified by:

decodeGeometryEnvelope in class SQLDialect

Parameters:

rs - A result set

column - Index into the result set which points at the spatial extent value.

cx - The database connection.

Throws:

SQLException

IOException

createFilterToSQL

public FilterToSQL createFilterToSQL()

Description copied from class: BasicSQLDialect

Creates the filter encoder to be used by the datastore when encoding query predicates.

Sublcasses can override this method to return a subclass of FilterToSQL if need be.

Overrides:

createFilterToSQL in class BasicSQLDialect

encodeTableName

protected void encodeTableName(String schemaName,
                               String tableName,
                               StringBuffer sql,
                               boolean escape)

isLimitOffsetSupported

public boolean isLimitOffsetSupported()

Description copied from class: SQLDialect

Returns true if this dialect can encode both Query.getStartIndex() and Query.getMaxFeatures() into native SQL.

Overrides:

isLimitOffsetSupported in class SQLDialect

applyLimitOffset

public void applyLimitOffset(StringBuffer sql,
                             int limit,
                             int offset)

Description copied from class: SQLDialect

Alters the query provided so that limit and offset are natively dealt with. This might mean simply appending some extra directive to the query, or wrapping it into a bigger one.

Overrides:

applyLimitOffset in class SQLDialect

encodeValue

public void encodeValue(Object value,
                        Class type,
                        StringBuffer sql)

Description copied from class: BasicSQLDialect

Encodes a value in an sql statement.

Subclasses may wish to override or extend this method to handle specific types. This default implementation does the following:

1. The value is encoded via its Object.toString() representation.
2. If type is a character type (extends CharSequence), it is wrapped in single quotes (').

Overrides:

encodeValue in class BasicSQLDialect

getGeometryMetadataTable

public String getGeometryMetadataTable()

The geometry metadata table in use, if any

setGeometryMetadataTable

public void setGeometryMetadataTable(String geometryMetadataTable)

Sets the geometry metadata table

setUseOffSetLimit

public void setUseOffSetLimit(Boolean useOffsetLimit)

Sets whether to use offset limit or not

setUseNativeSerialization

public void setUseNativeSerialization(Boolean useNativeSerialization)

Sets whether to use native SQL Server binary serialization or WKB serialization

setForceSpatialIndexes

public void setForceSpatialIndexes(boolean forceSpatialIndexes)

Sets whether to force the usage of spatial indexes by including a WITH INDEX hint

setTableHints

public void setTableHints(String tableHints)

Sets a comma separated list of table hints that will be added to every select query

dropIndex

public void dropIndex(Connection cx,
                      SimpleFeatureType schema,
                      String databaseSchema,
                      String indexName)
               throws SQLException

Drop the index. Subclasses can override to handle extra syntax or db specific situations

Overrides:

dropIndex in class SQLDialect

Throws:

SQLException

postCreateFeatureType

public void postCreateFeatureType(SimpleFeatureType featureType,
                                  DatabaseMetaData md,
                                  String databaseSchema,
                                  Connection cx)
                           throws SQLException

Description copied from class: SQLDialect

Callback which executes after a feature type has been built from a database table.

This base implementation does nothing, subclasses should override as need be.

Overrides:

postCreateFeatureType in class SQLDialect

Parameters:

featureType - The build feature type.

md - The database metadata.

databaseSchema - The name of the database scheam containing the table containing the column

cx - The database connection.

Throws:

SQLException

handleSelectHints

public void handleSelectHints(StringBuffer sql,
                              SimpleFeatureType featureType,
                              Query query)

Description copied from class: SQLDialect

Used to apply search hints on the fully generated SQL (complete of select, from, where, sort, limit/offset)

Overrides:

handleSelectHints in class SQLDialect

lookupGeneratedValuesPostInsert

public boolean lookupGeneratedValuesPostInsert()

Description copied from class: SQLDialect

Controls whether keys are looked up post or pre insert.

When a row is inserted into a table, and a key is automatically generated it can be looked up before the insert occurs, or after the insert has been made. Returning false will cause the lookup to occur before the insert via SQLDialect.getNextAutoGeneratedValue(String, String, String, Connection). Returning true will cause the lookup to occur after the insert via SQLDialect.getLastAutoGeneratedValue(String, String, String, Connection).

Subclasses returning false should implement:

• SQLDialect.getNextAutoGeneratedValue(String, String, String, Connection)

Subclasses returning true should implement:

• SQLDialect.getLastAutoGeneratedValue(String, String, String, Connection)

Overrides:

lookupGeneratedValuesPostInsert in class SQLDialect

getLastAutoGeneratedValue

public Object getLastAutoGeneratedValue(String schemaName,
                                        String tableName,
                                        String columnName,
                                        Connection cx,
                                        Statement st)
                                 throws SQLException

Description copied from class: SQLDialect

Obtains the last value of an auto generated column.

This method is only called when SQLDialect.lookupGeneratedValuesPostInsert() returns true. Implementations should determine the previous value of a column for which was automatically generated by the database.

This method is given a direct connection to the database, but this connection should never be closed. However any statements or result sets instantiated from the connection must be closed.

Implementations should handle the case where schemaName is null.

Overrides:

getLastAutoGeneratedValue in class SQLDialect

Parameters:

schemaName - The schema name, this might be null.

tableName - The name of the table.

columnName - The column.

cx - The database connection.

st - The statement used for the insert

Returns:

The previous value of the column, or null.

Throws:

SQLException

registerAggregateFunctions

public void registerAggregateFunctions(Map<Class<? extends FeatureVisitor>,String> aggregates)

Description copied from class: SQLDialect

Registers the set of aggregate functions the dialect is capable of handling.

Aggregate functions are handled via visitors of special types. The aggregates maps the class of the visitor to the associated function name. This base implementation handles some of the well known mappings:

• UniqueVisitor -> "unique"
• CountVisitor -> "count"
• MaxVisitor -> "max"
• MinVisitor -> "min"
• SumVisitor -> "sum"
• AverageVisitor -> "avg"
• StandardDeviationVisitor -> "stddev_pop"

Subclasses should extend (not override) to provide additional functions.

Overrides:

registerAggregateFunctions in class SQLDialect