org.geotools.data.sqlserver
Class SQLServerDialect

Object
  extended by SQLDialect
      extended by BasicSQLDialect
          extended by SQLServerDialect

public class SQLServerDialect
extends BasicSQLDialect

Dialect implementation for Microsoft SQL Server.

Author:
Justin Deoliveira, OpenGEO
Module:
modules/plugin/jdbc-sqlserver (gt-jdbc-sqlserver.jar)

Field Summary
 
Fields inherited from class SQLDialect
BASE_DBMS_CAPABILITIES, dataStore, LOGGER
 
Constructor Summary
SQLServerDialect(JDBCDataStore dataStore)
           
 
Method Summary
 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)
          Decodes a geometry value from the result of a query.
 void encodeGeometryColumn(GeometryDescriptor gatt, int srid, 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 srid, StringBuffer sql)
          Encodes a geometry value in an sql statement.
 Integer getGeometrySRID(String schemaName, String tableName, String columnName, Connection cx)
          Returns the spatial reference system identifier (srid) for a particular geometry column.
 String getGeometryTypeName(Integer type)
          Returns the name of a geometric type based on its integer constant.
 Object getNextAutoGeneratedValue(String schemaName, String tableName, String columnName, Connection cx)
          Obtains the next value of an auto generated column.
 boolean includeTable(String schemaName, String tableName, Connection cx)
          Determines if the specified table should be included in those published by the datastore.
 void postCreateTable(String schemaName, SimpleFeatureType featureType, Connection cx)
          Callback to execute any additional sql statements post a create table statement.
 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
 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.
 
Methods inherited from class BasicSQLDialect
encodeValue
 
Methods inherited from class SQLDialect
addSupportedHints, applyLimitOffset, createCRS, decodeGeometryValue, encodeColumnAlias, encodeColumnName, encodeColumnType, encodeGeometryColumnGeneralized, encodeGeometryColumnSimplified, encodePostColumnCreateTable, encodePostCreateTable, encodePrimaryKey, encodeSchemaName, encodeTableAlias, encodeTableName, getLastAutoGeneratedValue, getMapping, getNameEscape, getNextSequenceValue, getSequenceForColumn, initializeConnection, isLimitOffsetSupported, lookupGeneratedValuesPostInsert, ne, postCreateAttribute, postCreateFeatureType, registerAggregateFunctions, registerSqlTypeToClassMappings
 
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

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

encodeGeometryColumn

public void encodeGeometryColumn(GeometryDescriptor gatt,
                                 int srid,
                                 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, StringBuffer) function.

Example:

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

This default implementation simply uses the column name without any wrapping function, subclasses must override.

Overrides:
encodeGeometryColumn in class SQLDialect

encodeGeometryValue

public void encodeGeometryValue(Geometry value,
                                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.

Specified by:
encodeGeometryValue in class BasicSQLDialect
Throws:
IOException

decodeGeometryValue

public Geometry decodeGeometryValue(GeometryDescriptor descriptor,
                                    ResultSet rs,
                                    String column,
                                    GeometryFactory factory,
                                    Connection cx)
                             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 SQLDialect.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.
Throws:
SQLException
IOException

getNextAutoGeneratedValue

public Object getNextAutoGeneratedValue(String schemaName,
                                        String tableName,
                                        String columnName,
                                        Connection cx)
                                 throws SQLException
Description copied from class: SQLDialect
Obtains the next value of an auto generated column.

Implementations should determine the next value of a column for which values are 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:
getNextAutoGeneratedValue 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.
Returns:
The next value of the column, or null.
Throws:
SQLException

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


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