org.geotools.data.oracle
Class OracleDialect

Object
  extended by SQLDialect
      extended by PreparedStatementSQLDialect
          extended by OracleDialect

public class OracleDialect
extends PreparedStatementSQLDialect

Abstract dialect implementation for Oracle. Subclasses differ on the way used to parse and encode the JTS geoemtries into Oracle MDSYS.SDO_GEOMETRY structures.

Author:
Justin Deoliveira, OpenGEO, Andrea Aime, OpenGEO

Field Summary
static Map<Class,String> CLASSES_TO_GEOM
          A map from JTS Geometry type to Oracle geometry type.
static String GEODETIC
          Marks a geometry column as geodetic
 
Fields inherited from class SQLDialect
BASE_DBMS_CAPABILITIES, dataStore, LOGGER
 
Constructor Summary
OracleDialect(JDBCDataStore dataStore)
           
 
Method Summary
 void applyLimitOffset(StringBuffer sql, int limit, int offset)
          Alters the query provided so that limit and offset are natively dealt with.
 CoordinateReferenceSystem createCRS(int srid, Connection cx)
          Turns the specified srid into a CoordinateReferenceSystem, or returns null if not possible.
 FilterToSQL createFilterToSQL()
           
 PreparedFilterToSQL createPreparedFilterToSQL()
           
 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, int column, GeometryFactory factory, Connection cx)
          Decodes a geometry value from the result of a query specifying the column as an index.
 Geometry decodeGeometryValue(GeometryDescriptor descriptor, ResultSet rs, String column, GeometryFactory factory, Connection cx)
          Decodes a geometry value from the result of a query.
 void encodeColumnName(String prefix, String raw, StringBuffer sql)
          Encodes the name of a column in an SQL statement.
 void encodeGeometryEnvelope(String tableName, String geometryColumn, StringBuffer sql)
          Encodes the spatial extent function of a geometry column in a SELECT statement.
 void encodeTableAlias(String raw, StringBuffer sql)
          Encodes the alias of a table in an sql query.
 void encodeTableName(String raw, StringBuffer sql)
          Encodes the name of a table in an SQL statement.
 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.
 String getGeometryTypeName(Integer type)
          Returns the name of a geometric type based on its integer constant.
 Class<?> getMapping(ResultSet columnMetaData, Connection cx)
          Determines the class mapping for a particular column of a table.
 String getNameEscape()
          Returns the string used to escape names.
 Object getNextSequenceValue(String schemaName, String sequenceName, Connection cx)
          Obtains the next value of a sequence, incrementing the sequence to the next state in the process.
 List<ReferencedEnvelope> getOptimizedBounds(String schema, SimpleFeatureType featureType, Connection cx)
          Returns the bounds of all geometry columns in the layer using any approach that proves to be faster than the plain bounds aggregation (e.g., better than the "plain select extent(geom) from table" on PostGIS), or null if none exists or the fast method has not been enabled (e.g., if the fast method is just an estimate of the bounds you probably want the user to enable it manually)
 String getSequenceForColumn(String schemaName, String tableName, String columnName, Connection cx)
          Determines the name of the sequence (if any) which is used to increment generate values for a table column.
 boolean includeTable(String schemaName, String tableName, Connection cx)
          Determines if the specified table should be included in those published by the datastore.
 boolean isEstimatedExtentsEnabled()
           
protected  boolean isGeodeticSrid(Integer srid, Connection cx)
          Checks if the specified srid is geodetic or not
 boolean isLimitOffsetSupported()
          Returns true if this dialect can encode both Query.getStartIndex() and Query.getMaxFeatures() into native SQL.
 boolean isLooseBBOXEnabled()
           
 void postCreateAttribute(AttributeDescriptor att, String tableName, String schemaName, Connection cx)
          Callback which executes after an attribute descriptor has been built from a table column.
 void postCreateTable(String schemaName, SimpleFeatureType featureType, Connection cx)
          Callback to execute any additional sql statements post a create table statement.
 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 setEstimatedExtentsEnabled(boolean estimatedExtenstEnabled)
           
 void setGeometryMetadataTable(String geometryMetadataTable)
          Sets the geometry metadata table
 void setGeometryValue(Geometry g, int srid, Class binding, PreparedStatement ps, int column)
          Sets the geometry value into the prepared statement.
 void setLooseBBOXEnabled(boolean looseBBOXEnabled)
           
 
Methods inherited from class PreparedStatementSQLDialect
onDelete, onInsert, onSelect, onUpdate, prepareFunctionArgument, prepareGeometryValue, setValue
 
Methods inherited from class SQLDialect
addSupportedHints, encodeColumnAlias, encodeColumnName, encodeColumnType, encodeGeometryColumn, encodeGeometryColumn, encodeGeometryColumn, encodeGeometryColumnGeneralized, encodeGeometryColumnGeneralized, encodeGeometryColumnSimplified, encodeGeometryColumnSimplified, encodeJoin, encodePostColumnCreateTable, encodePostCreateTable, encodePostSelect, encodePrimaryKey, encodeSchemaName, getDefaultVarcharSize, getLastAutoGeneratedValue, getNextAutoGeneratedValue, handleSelectHints, handleUserDefinedType, initializeConnection, isAutoCommitQuery, lookupGeneratedValuesPostInsert, ne, postCreateFeatureType, registerAggregateFunctions, registerClassToSqlMappings, registerSqlTypeToClassMappings
 
Methods inherited from class Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

GEODETIC

public static final String GEODETIC
Marks a geometry column as geodetic

See Also:
Constant Field Values

CLASSES_TO_GEOM

public static final Map<Class,String> CLASSES_TO_GEOM
A map from JTS Geometry type to Oracle geometry type. See Oracle Spatial documentation, Table 2-1, Valid SDO_GTYPE values.

Constructor Detail

OracleDialect

public OracleDialect(JDBCDataStore dataStore)
Method Detail

isLooseBBOXEnabled

public boolean isLooseBBOXEnabled()

setLooseBBOXEnabled

public void setLooseBBOXEnabled(boolean looseBBOXEnabled)

isEstimatedExtentsEnabled

public boolean isEstimatedExtentsEnabled()

setEstimatedExtentsEnabled

public void setEstimatedExtentsEnabled(boolean estimatedExtenstEnabled)

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
Returns:
The class mapped to the to column, or null.
Throws:
SQLException

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

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

getNameEscape

public String getNameEscape()
Description copied from class: SQLDialect
Returns the string used to escape names.

This value is used to escape any name in a query. This includes columns, tables, schemas, indexes, etc... If no escape is necessary this method should return the empty string, and never return null.

This default implementation returns a single double quote ("), subclasses must override to provide a different espcape.

Overrides:
getNameEscape in class SQLDialect

encodeColumnName

public void encodeColumnName(String prefix,
                             String raw,
                             StringBuffer sql)
Description copied from class: SQLDialect
Encodes the name of a column in an SQL statement.

This method wraps raw in the character provided by SQLDialect.getNameEscape(). Subclasses usually don't override this method and instead override SQLDialect.getNameEscape().

The prefix parameter may be null so subclasses that do override must handle that case.

Overrides:
encodeColumnName in class SQLDialect

encodeTableName

public void encodeTableName(String raw,
                            StringBuffer sql)
Description copied from class: SQLDialect
Encodes the name of a table in an SQL statement.

This method wraps raw in the character provided by SQLDialect.getNameEscape(). Subclasses usually dont override this method and instead override SQLDialect.getNameEscape().

Overrides:
encodeTableName in class SQLDialect

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

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

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

decodeGeometryValue

public Geometry decodeGeometryValue(GeometryDescriptor descriptor,
                                    ResultSet rs,
                                    int column,
                                    GeometryFactory factory,
                                    Connection cx)
                             throws IOException,
                                    SQLException
Description copied from class: SQLDialect
Decodes a geometry value from the result of a query specifying the column as an index.

See #decodeGeometryValue(GeometryDescriptor, ResultSet, String, GeometryFactory) for a more in depth description.

Overrides:
decodeGeometryValue in class SQLDialect
Throws:
IOException
SQLException
See Also:
#decodeGeometryValue(GeometryDescriptor, ResultSet, String, GeometryFactory)}.

setGeometryValue

public void setGeometryValue(Geometry g,
                             int srid,
                             Class binding,
                             PreparedStatement ps,
                             int column)
                      throws SQLException
Description copied from class: PreparedStatementSQLDialect
Sets the geometry value into the prepared statement.

Specified by:
setGeometryValue in class PreparedStatementSQLDialect
Parameters:
g - The geometry
srid - the geometry native srid (should be forced into the encoded geometry)
binding - the geometry type
ps - the prepared statement
column - the column index where the geometry is to be set
Throws:
SQLException

createFilterToSQL

public FilterToSQL createFilterToSQL()

createPreparedFilterToSQL

public PreparedFilterToSQL createPreparedFilterToSQL()
Overrides:
createPreparedFilterToSQL in class PreparedStatementSQLDialect

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

createCRS

public CoordinateReferenceSystem createCRS(int srid,
                                           Connection cx)
                                    throws SQLException
Description copied from class: SQLDialect
Turns the specified srid into a CoordinateReferenceSystem, or returns null if not possible.

The implementation might just use CRS.decode("EPSG:" + srid), but most spatial databases will have their own SRS database that can be queried as well.

As a rule of thumb you should override this method if your spatial database uses codes that are not part of the EPSG standard database, of if for some reason you deem it preferable to use your database definition instead of an official EPSG one.

Most overrides will try out to decode the official EPSG code first, and fall back on the custom database definition otherwise

Overrides:
createCRS in class SQLDialect
Returns:
Throws:
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

getOptimizedBounds

public List<ReferencedEnvelope> getOptimizedBounds(String schema,
                                                   SimpleFeatureType featureType,
                                                   Connection cx)
                                            throws SQLException,
                                                   IOException
Description copied from class: SQLDialect
Returns the bounds of all geometry columns in the layer using any approach that proves to be faster than the plain bounds aggregation (e.g., better than the "plain select extent(geom) from table" on PostGIS), or null if none exists or the fast method has not been enabled (e.g., if the fast method is just an estimate of the bounds you probably want the user to enable it manually)

Overrides:
getOptimizedBounds in class SQLDialect
Parameters:
schema - The database schema, if any, or null
featureType - The feature type containing the geometry columns whose bounds need to computed. Mind, it may be retyped and thus contain less geometry columns than the table
Returns:
a list of referenced envelopes (some of which may be null or empty)
Throws:
SQLException
IOException

postCreateTable

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

getSequenceForColumn

public String getSequenceForColumn(String schemaName,
                                   String tableName,
                                   String columnName,
                                   Connection cx)
                            throws SQLException
Description copied from class: SQLDialect
Determines the name of the sequence (if any) which is used to increment generate values for a table column.

This method should return null if no such sequence exists.

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.

Overrides:
getSequenceForColumn in class SQLDialect
Parameters:
schemaName - The schema name, this might be null.
tableName - The table name.
columnName - The column name.
cx - The database connection.
Throws:
SQLException

getNextSequenceValue

public Object getNextSequenceValue(String schemaName,
                                   String sequenceName,
                                   Connection cx)
                            throws SQLException
Description copied from class: SQLDialect
Obtains the next value of a sequence, incrementing the sequence to the next state in the process.

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:
getNextSequenceValue in class SQLDialect
Parameters:
schemaName - The schema name, this might be null.
sequenceName - The name of the sequence.
cx - The database connection.
Returns:
The next value of the sequence, or null.
Throws:
SQLException

isGeodeticSrid

protected boolean isGeodeticSrid(Integer srid,
                                 Connection cx)
Checks if the specified srid is geodetic or not

Throws:
SQLException

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
Returns:

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

encodeTableAlias

public void encodeTableAlias(String raw,
                             StringBuffer sql)
Description copied from class: SQLDialect
Encodes the alias of a table in an sql query.

This default implementation uses the syntax:

as "alias"
. Subclasses should override to provide a different syntax.

Overrides:
encodeTableAlias 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

postCreateAttribute

public void postCreateAttribute(AttributeDescriptor att,
                                String tableName,
                                String schemaName,
                                Connection cx)
                         throws SQLException
Description copied from class: SQLDialect
Callback which executes after an attribute descriptor has been built from a table column.

The result set columnMetadata should not be modified in any way (including scrolling) , it should only be read from.

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

Overrides:
postCreateAttribute in class SQLDialect
Parameters:
att - The built attribute descriptor.
tableName - The name of the table containing the column
schemaName - The name of the database scheam containing the table containing the column
cx - The database connection.
Throws:
SQLException

getGeometryMetadataTable

public String getGeometryMetadataTable()
The geometry metadata table in use, if any

Returns:

setGeometryMetadataTable

public void setGeometryMetadataTable(String geometryMetadataTable)
Sets the geometry metadata table

Parameters:
geometryMetadataTable -


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