Class GeoPkgDialect
- Object
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- SQLDialect
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- PreparedStatementSQLDialect
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- GeoPkgDialect
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public class GeoPkgDialect extends PreparedStatementSQLDialect
The GeoPackage SQL Dialect.- Author:
- Justin Deoliveira, Niels Charlier
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Field Summary
Fields Modifier and Type Field Description protected boolean
contentsOnly
protected GeoPkgGeomWriter.Configuration
geomWriterConfig
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Fields inherited from class SQLDialect
BASE_DBMS_CAPABILITIES, dataStore, forceLongitudeFirst, LOGGER, UNWRAPPER_NOT_FOUND, uwMap
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Constructor Summary
Constructors Constructor Description GeoPkgDialect(JDBCDataStore dataStore)
GeoPkgDialect(JDBCDataStore dataStore, GeoPkgGeomWriter.Configuration writerConfig)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected void
addSupportedHints(Set<Hints.Key> hints)
Add hints to the JDBC Feature Source.void
applyLimitOffset(StringBuffer sql, int limit, int offset)
Alters the query provided so that limit and offset are natively dealt with.boolean
canGroupOnGeometry()
Returns true if this database can "group by" on a Geometry column.protected <T> T
convert(Object value, Class<T> binding)
Object
convertValue(Object value, AttributeDescriptor ad)
Convertes the given value to the target type.CoordinateReferenceSystem
createCRS(int srid, Connection cx)
Turns the specified srid into aCoordinateReferenceSystem
, or returnsnull
if not possible.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, Hints hints)
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, Hints hints)
Decodes a geometry value from the result of a query.void
encodeColumnType(String sqlTypeName, StringBuffer sql)
Encodes the type of a column in an SQL CREATE TABLE statement.void
encodeGeometryEnvelope(String tableName, String geometryColumn, StringBuffer sql)
Encodes the spatial extent function of a geometry column in a SELECT statement.void
encodePrimaryKey(String column, StringBuffer sql)
Encodes the primary key definition in a CREATE TABLE statement.Function<Object,Object>
getAggregateConverter(FeatureVisitor visitor, SimpleFeatureType featureType)
SQLite dates are just strings, they don't get converted to Date in case of aggregation, do it here insteadint
getGeometryDimension(String schemaName, String tableName, String columnName, Connection cx)
Returns the dimension of the coordinates in the geometry.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
getLastAutoGeneratedValue(String schemaName, String tableName, String columnName, Connection cx)
Obtains the last value of an auto generated column.Class<?>
getMapping(ResultSet columns, Connection cx)
Determines the class mapping for a particular column of a table.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
getPkColumnValue(ResultSet rs, PrimaryKeyColumn pkey, int columnIdx)
Reads a primary key column value.protected PrimaryKey
getPrimaryKey(String typeName)
Filter
getRestrictions(ResultSet columns, Connection cx)
Allows the dialect to setup restrictions for attribute at handInteger
getSQLType(AttributeDescriptor ad)
Gives an opportunity to the dialect to do its own custom type mapping, based on the full description of the attribute.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.boolean
isArray(AttributeDescriptor att)
Returns true if the attribute in question is an array.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
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
postDropTable(String schemaName, SimpleFeatureType featureType, Connection cx)
Callback which executes after a table has been dropped.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.void
setArrayValue(Object value, AttributeDescriptor att, PreparedStatement ps, int columnIdx, Connection cx)
Sets a value in a prepared statement, for the specific case ofArray
void
setContentsOnly(boolean contentsOnly)
Whether to return only tables listed as features in gpkg_contents, or give access to all other tables (careful, enabling this and then writing might cause the GeoPackage not to conform to spec any longer, use at your discretion)void
setGeometryValue(Geometry g, int dimension, int srid, Class binding, PreparedStatement ps, int column)
Sets the geometry value into the prepared statement.void
setValue(Object value, Class binding, PreparedStatement ps, int column, Connection cx)
Sets a value in a prepared statement, for "basic types" (non-geometry).Filter[]
splitFilter(Filter filter, SimpleFeatureType schema)
Splits the filter into two parts, an encodable one, and a non encodable one.-
Methods inherited from class PreparedStatementSQLDialect
convertArrayElement, convertToArray, getArrayComponentTypeName, onDelete, onInsert, onSelect, onUpdate, prepareFunctionArgument, prepareGeometryValue, prepareGeometryValue
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Methods inherited from class SQLDialect
applyHintsOnVirtualTables, canSimplifyPoints, createIndex, dropIndex, encodeColumnAlias, encodeColumnName, encodeCreateTable, encodeGeometryColumn, encodeGeometryColumnGeneralized, encodeGeometryColumnSimplified, encodeJoin, encodeNextSequenceValue, encodePostColumnCreateTable, encodePostCreateTable, encodePostSelect, encodeSchemaName, encodeTableAlias, encodeTableName, escapeName, getDefaultVarcharSize, getDesiredTablesType, getIndexes, getLastAutoGeneratedValue, getMapping, getNameEscape, getNextAutoGeneratedValue, getNextSequenceValue, getResultTypes, getSequenceForColumn, handleSelectHints, handleUserDefinedType, isAggregatedSortSupported, isAutoCommitQuery, isGroupBySupported, ne, postCreateFeatureType, preDropTable, registerAggregateFunctions, registerSqlTypeToClassMappings, supportsSchemaForIndex, unwrapConnection
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Field Detail
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geomWriterConfig
protected GeoPkgGeomWriter.Configuration geomWriterConfig
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contentsOnly
protected boolean contentsOnly
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Constructor Detail
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GeoPkgDialect
public GeoPkgDialect(JDBCDataStore dataStore, GeoPkgGeomWriter.Configuration writerConfig)
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GeoPkgDialect
public GeoPkgDialect(JDBCDataStore dataStore)
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Method Detail
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initializeConnection
public void initializeConnection(Connection cx) throws SQLException
Description copied from class:SQLDialect
Initializes a newly created database connection.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.
- Overrides:
initializeConnection
in classSQLDialect
- Parameters:
cx
- The new database connection.- Throws:
SQLException
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setContentsOnly
public void setContentsOnly(boolean contentsOnly)
Whether to return only tables listed as features in gpkg_contents, or give access to all other tables (careful, enabling this and then writing might cause the GeoPackage not to conform to spec any longer, use at your discretion)- Parameters:
contentsOnly
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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 returnsfalse
. Subclasses should override this method, this default implementation returnstrue
.
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 classSQLDialect
- Parameters:
schemaName
- The schema of the table, might benull
..tableName
- The name of the table.cx
- Database connection.- Throws:
SQLException
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encodePrimaryKey
public void encodePrimaryKey(String column, StringBuffer sql)
Description copied from class:SQLDialect
Encodes the primary key definition in a CREATE TABLE statement.Subclasses should override this method if need be, the default implementation does the following:
encodeColumnName( column, sql ); sql.append( " int PRIMARY KEY" );
- Overrides:
encodePrimaryKey
in classSQLDialect
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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 classSQLDialect
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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 classSQLDialect
- Parameters:
rs
- A result setcolumn
- Index into the result set which points at the spatial extent value.cx
- The database connection.- Throws:
SQLException
IOException
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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 );
null
values.The factory parameter should be used to instantiate any geometry objects.
- Specified by:
decodeGeometryValue
in classSQLDialect
- Throws:
IOException
SQLException
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decodeGeometryValue
public Geometry decodeGeometryValue(GeometryDescriptor descriptor, ResultSet rs, int 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 specifying the column as an index.See
#decodeGeometryValue(GeometryDescriptor, ResultSet, String, GeometryFactory)
for a more in depth description.- Overrides:
decodeGeometryValue
in classSQLDialect
- Throws:
IOException
SQLException
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setGeometryValue
public void setGeometryValue(Geometry g, int dimension, 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 classPreparedStatementSQLDialect
- Parameters:
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- Throws:
SQLException
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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 classSQLDialect
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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 classSQLDialect
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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 classSQLDialect
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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 classSQLDialect
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getMapping
public Class<?> getMapping(ResultSet columns, 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)
andare 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 classSQLDialect
- Parameters:
columns
- The column metadatacx
- The connection used to retrieve the metadata- Returns:
- The class mapped to the to column, or
null
. - Throws:
SQLException
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getRestrictions
public Filter getRestrictions(ResultSet columns, Connection cx) throws SQLException
Description copied from class:SQLDialect
Allows the dialect to setup restrictions for attribute at hand- Overrides:
getRestrictions
in classSQLDialect
- Parameters:
columns
- The column metadatacx
- The connection used to retrieve the metadata- Returns:
- The restriction, or null if no restriction applies
- Throws:
SQLException
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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 classSQLDialect
- Parameters:
schemaName
- The name of the schema, may benull
.featureType
- The feature type that has just been created on the database.cx
- Database connection.- Throws:
SQLException
IOException
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postDropTable
public void postDropTable(String schemaName, SimpleFeatureType featureType, Connection cx) throws SQLException
Description copied from class:SQLDialect
Callback which executes after a table has been dropped.This base implementation does nothing, subclasses should override as need be.
- Overrides:
postDropTable
in classSQLDialect
- Parameters:
schemaName
- The database schema containing the table.featureType
- The featureType/table being dropped.cx
- The database connection.- Throws:
SQLException
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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 classSQLDialect
- Parameters:
schemaName
- The database schema, could benull
.tableName
- The table, nevernull
.columnName
- The column name, nevernull
cx
- The database connection.- Throws:
SQLException
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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 classSQLDialect
- Parameters:
schemaName
- The database schema, could benull
.tableName
- The table, nevernull
.columnName
- The column name, nevernull
cx
- The database connection.- Throws:
SQLException
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createCRS
public CoordinateReferenceSystem createCRS(int srid, Connection cx) throws SQLException
Description copied from class:SQLDialect
Turns the specified srid into aCoordinateReferenceSystem
, or returnsnull
if not possible.Note this implementation takes account of
SQLDialect.forceLongitudeFirst
which should be set when longitude first (XY) axis ordering is required.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 classSQLDialect
- Throws:
SQLException
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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 viaSQLDialect.getNextAutoGeneratedValue(String, String, String, Connection)
. Returningtrue
will cause the lookup to occur after the insert viaSQLDialect.getLastAutoGeneratedValue(String, String, String, Connection)
.Subclasses returning false should implement:
Subclasses returning true should implement:
- Overrides:
lookupGeneratedValuesPostInsert
in classSQLDialect
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getLastAutoGeneratedValue
public Object getLastAutoGeneratedValue(String schemaName, String tableName, String columnName, Connection cx) 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 classSQLDialect
- Parameters:
schemaName
- The schema name, this might benull
.tableName
- The name of the table.columnName
- The column.cx
- The database connection.- Returns:
- The previous value of the column, or
null
. - Throws:
SQLException
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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 classSQLDialect
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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 classSQLDialect
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createPreparedFilterToSQL
public PreparedFilterToSQL createPreparedFilterToSQL()
- Overrides:
createPreparedFilterToSQL
in classPreparedStatementSQLDialect
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setValue
public void setValue(Object value, Class binding, PreparedStatement ps, int column, Connection cx) throws SQLException
Description copied from class:PreparedStatementSQLDialect
Sets a value in a prepared statement, for "basic types" (non-geometry).Subclasses should override this method if they need to do something custom or they wish to support non-standard types.
- Overrides:
setValue
in classPreparedStatementSQLDialect
- Parameters:
value
- the value.binding
- The class of the value.ps
- The prepared statement.column
- The column the value maps to.cx
- The database connection.- Throws:
SQLException
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setArrayValue
public void setArrayValue(Object value, AttributeDescriptor att, PreparedStatement ps, int columnIdx, Connection cx) throws SQLException
Description copied from class:PreparedStatementSQLDialect
Sets a value in a prepared statement, for the specific case ofArray
This method uses the standard SQL Array handling, subclasses can override to add special behavior
- Overrides:
setArrayValue
in classPreparedStatementSQLDialect
- Parameters:
value
- the value.att
- The full attribute descriptionps
- The prepared statement.columnIdx
- The column the value maps to.cx
- The database connection.- Throws:
SQLException
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isArray
public boolean isArray(AttributeDescriptor att)
Description copied from class:SQLDialect
Returns true if the attribute in question is an array. By default comparers theJDBCDataStore.JDBC_NATIVE_TYPE
stored in the attribute user data withTypes.ARRAY
, but subclasses can override to use a different approach.- Overrides:
isArray
in classSQLDialect
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encodeColumnType
public void encodeColumnType(String sqlTypeName, StringBuffer sql)
Description copied from class:SQLDialect
Encodes the type of a column in an SQL CREATE TABLE statement.The default implementation simply outputs the sqlTypeName argument as is. Subclasses may override this method. Such cases might include:
- A type definition requires some parameter, ex: size of a varchar
- The provided attribute (att) contains some additional restrictions that can be encoded in the type, ex: field length
- Overrides:
encodeColumnType
in classSQLDialect
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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 classSQLDialect
- Parameters:
att
- The built attribute descriptor.tableName
- The name of the table containing the columnschemaName
- The name of the database scheam containing the table containing the columncx
- The database connection.- Throws:
SQLException
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splitFilter
public Filter[] splitFilter(Filter filter, SimpleFeatureType schema)
Description copied from class:SQLDialect
Splits the filter into two parts, an encodable one, and a non encodable one. The default implementation uses the filter capabilities to split the filter, subclasses can implement their own logic if need be.- Overrides:
splitFilter
in classSQLDialect
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getPrimaryKey
protected PrimaryKey getPrimaryKey(String typeName) throws IOException
- Overrides:
getPrimaryKey
in classSQLDialect
- Throws:
IOException
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convert
protected <T> T convert(Object value, Class<T> binding)
- Overrides:
convert
in classPreparedStatementSQLDialect
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getPkColumnValue
public String getPkColumnValue(ResultSet rs, PrimaryKeyColumn pkey, int columnIdx) throws SQLException
Description copied from class:SQLDialect
Reads a primary key column value. By default usesResultSet.getString(int)
, subclasses can use a more efficient way should they wish to- Overrides:
getPkColumnValue
in classSQLDialect
- Throws:
SQLException
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addSupportedHints
protected void addSupportedHints(Set<Hints.Key> hints)
Description copied from class:SQLDialect
Add hints to the JDBC Feature Source. A subclass can overridepossible hints (but not limited to)
- Overrides:
addSupportedHints
in classSQLDialect
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getAggregateConverter
public Function<Object,Object> getAggregateConverter(FeatureVisitor visitor, SimpleFeatureType featureType)
SQLite dates are just strings, they don't get converted to Date in case of aggregation, do it here instead- Overrides:
getAggregateConverter
in classSQLDialect
- Returns:
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getSQLType
public Integer getSQLType(AttributeDescriptor ad)
Description copied from class:SQLDialect
Gives an opportunity to the dialect to do its own custom type mapping, based on the full description of the attribute. Defaults to returnnull
, subclasses can override- Overrides:
getSQLType
in classSQLDialect
- Parameters:
ad
- The attribute descriptor- Returns:
- A SQL type from
Types
, or null if customization is needed
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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 classSQLDialect
- Parameters:
schema
- The database schema, if any, or nullfeatureType
- 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
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convertValue
public Object convertValue(Object value, AttributeDescriptor ad)
Description copied from class:SQLDialect
Convertes the given value to the target type. The default implementation uses converters to match the attribute descriptor binding, subclasses can override.- Overrides:
convertValue
in classSQLDialect
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canGroupOnGeometry
public boolean canGroupOnGeometry()
Description copied from class:SQLDialect
Returns true if this database can "group by" on a Geometry column. Defaults to false, specific implementations with this capability should override- Overrides:
canGroupOnGeometry
in classSQLDialect
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