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ObjectSQLDialect
PreparedStatementSQLDialect
GeoPkgDialect
public class GeoPkgDialect
Field Summary |
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Fields inherited from class SQLDialect |
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BASE_DBMS_CAPABILITIES, dataStore, LOGGER |
Constructor Summary | |
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GeoPkgDialect(JDBCDataStore dataStore)
|
Method Summary | |
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CoordinateReferenceSystem |
createCRS(int srid,
Connection cx)
Turns the specified srid into a CoordinateReferenceSystem , or returns null if not possible. |
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 |
encodeGeometryEnvelope(String tableName,
String geometryColumn,
StringBuffer sql)
Encodes the spatial extent function of a geometry column in a SELECT 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. |
Class<?> |
getMapping(ResultSet columns,
Connection cx)
Determines the class mapping for a particular column of a table. |
boolean |
includeTable(String schemaName,
String tableName,
Connection cx)
Determines if the specified table should be included in those published by the datastore. |
void |
initializeConnection(Connection cx)
Initializes a newly created database connection. |
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 |
setGeometryValue(Geometry g,
int dimension,
int srid,
Class binding,
PreparedStatement ps,
int column)
Sets the geometry value into the prepared statement. |
Methods inherited from class PreparedStatementSQLDialect |
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createPreparedFilterToSQL, onDelete, onInsert, onSelect, onUpdate, prepareFunctionArgument, prepareGeometryValue, setValue |
Methods inherited from class Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public GeoPkgDialect(JDBCDataStore dataStore)
Method Detail |
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public void initializeConnection(Connection cx) throws SQLException
SQLDialect
Subclasses should override this method if there is some additional action that needs to be taken when a new connection to the database is created. The default implementation does nothing.
initializeConnection
in class SQLDialect
cx
- The new database connection.
SQLException
public boolean includeTable(String schemaName, String tableName, Connection cx) throws SQLException
SQLDialect
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.
includeTable
in class SQLDialect
schemaName
- The schema of the table, might be null
..tableName
- The name of the table.cx
- Database connection.
SQLException
public void encodeGeometryEnvelope(String tableName, String geometryColumn, StringBuffer sql)
SQLDialect
This method must also be sure to properly encode the name of the column
with the SQLDialect.encodeColumnName(String, StringBuffer)
function.
encodeGeometryEnvelope
in class SQLDialect
public Envelope decodeGeometryEnvelope(ResultSet rs, int column, Connection cx) throws SQLException, IOException
SQLDialect
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.
decodeGeometryEnvelope
in class SQLDialect
rs
- A result setcolumn
- Index into the result set which points at the spatial extent
value.
SQLException
IOException
public Geometry decodeGeometryValue(GeometryDescriptor descriptor, ResultSet rs, String column, GeometryFactory factory, Connection cx) throws IOException, SQLException
SQLDialect
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:
Note that implementations must handle
String wkt = rs.getString( column );
if ( wkt == null ) {
return null;
}
return new WKTReader(factory).read( wkt );
null
values.
The factory parameter should be used to instantiate any geometry objects.
decodeGeometryValue
in class SQLDialect
IOException
SQLException
public void setGeometryValue(Geometry g, int dimension, int srid, Class binding, PreparedStatement ps, int column) throws SQLException
PreparedStatementSQLDialect
setGeometryValue
in class PreparedStatementSQLDialect
g
- The geometrysrid
- the geometry native srid (should be forced into the encoded geometry)binding
- the geometry typeps
- the prepared statementcolumn
- the column index where the geometry is to be set
SQLException
public String getGeometryTypeName(Integer type)
SQLDialect
The constant, type, is registered in SQLDialect.registerSqlTypeNameToClassMappings(Map)
.
This default implementation returns null
, subclasses should
override.
getGeometryTypeName
in class SQLDialect
public void registerSqlTypeNameToClassMappings(Map<String,Class<?>> mappings)
SQLDialect
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:
registerSqlTypeNameToClassMappings
in class SQLDialect
public void registerClassToSqlMappings(Map<Class<?>,Integer> mappings)
SQLDialect
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:
registerClassToSqlMappings
in class SQLDialect
public Class<?> getMapping(ResultSet columns, Connection cx) throws SQLException
SQLDialect
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)}.
getMapping
in class SQLDialect
columns
- The column metadata
null
.
SQLException
public void postCreateTable(String schemaName, SimpleFeatureType featureType, Connection cx) throws SQLException, IOException
SQLDialect
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:
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.
postCreateTable
in class SQLDialect
schemaName
- The name of the schema, may be null
.featureType
- The feature type that has just been created on the database.cx
- Database connection.
SQLException
IOException
public Integer getGeometrySRID(String schemaName, String tableName, String columnName, Connection cx) throws SQLException
SQLDialect
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
.
getGeometrySRID
in class SQLDialect
schemaName
- The database schema, could be null
.tableName
- The table, never null
.columnName
- The column name, never null
cx
- The database connection.
SQLException
public CoordinateReferenceSystem createCRS(int srid, Connection cx) throws SQLException
SQLDialect
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
createCRS
in class SQLDialect
SQLException
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