Class H2GISPSDialect
- Object
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- SQLDialect
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- PreparedStatementSQLDialect
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- H2GISPSDialect
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public class H2GISPSDialect extends PreparedStatementSQLDialect
jdbc-h2gis is an extension to connect H2GIS a spatial library that brings spatial support to the H2 Java database.H2GIS dialect based on prepared statements.
- Author:
- Erwan Bocher
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Field Summary
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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 H2GISPSDialect(JDBCDataStore store, H2GISDialect delegate)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
applyLimitOffset(StringBuffer sql, int limit, int offset)
Alters the query provided so that limit and offset are natively dealt with.boolean
canSimplifyPoints()
Returns if points can be returned in simplified form (e.g reduced precision, like TWKB encoding)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
encodeGeometryColumn(GeometryDescriptor gatt, String prefix, int srid, Hints hints, StringBuffer sql)
Encodes the name of a geometry column in a SELECT statement.void
encodeGeometryColumnGeneralized(GeometryDescriptor gatt, String prefix, int srid, StringBuffer sql, Double distance)
void
encodeGeometryColumnSimplified(GeometryDescriptor gatt, String prefix, int srid, StringBuffer sql, Double distance)
void
encodeGeometryEnvelope(String tableName, String geometryColumn, StringBuffer sql)
Encodes the spatial extent function of a geometry column in a SELECT statement.String
encodeNextSequenceValue(String schemaName, String sequenceName)
Encodes how to get the next sequence value from the DB.void
encodePrimaryKey(String column, StringBuffer sql)
Encodes the primary key definition in a CREATE TABLE statement.protected String
getArrayComponentTypeName(AttributeDescriptor att)
Given the full information about the attribute being transformed, figure out the native SQL Type Name to use when creating a SQL Array object· The default implementation just scansJDBCDataStore.getSqlTypeNameToClassMappings()
backwards, and will fail in case there are ambiguities.int
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 columnMetaData, Connection cx)
Determines the class mapping for a particular column of a table.Object
getNextAutoGeneratedValue(String schemaName, String tableName, String columnName, Connection cx)
Obtains the next value of an auto generated column.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.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.void
handleUserDefinedType(ResultSet columnMetaData, ColumnMetadata metadata, Connection cx)
Handles the mapping for a user defined type.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
isAggregatedSortSupported(String function)
Returns true if this dialect supports sorting together with the given aggregation function.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
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
preDropTable(String schemaName, SimpleFeatureType featureType, Connection cx)
Callback which executes before a table is about to be dropped.void
prepareGeometryValue(Class<? extends Geometry> gClass, int dimension, int srid, Class binding, StringBuffer sql)
Prepares the geometry value for a prepared 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.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
convert, convertArrayElement, convertToArray, onDelete, onInsert, onSelect, onUpdate, prepareFunctionArgument, prepareGeometryValue, setArrayValue, setValue
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Methods inherited from class SQLDialect
addSupportedHints, applyHintsOnVirtualTables, canGroupOnGeometry, convertValue, createCRS, createIndex, dropIndex, encodeColumnAlias, encodeColumnName, encodeColumnType, encodeCreateTable, encodeJoin, encodePostColumnCreateTable, encodePostCreateTable, encodePostSelect, encodeSchemaName, encodeTableAlias, encodeTableName, escapeName, getAggregateConverter, getDefaultVarcharSize, getDesiredTablesType, getIndexes, getLastAutoGeneratedValue, getMapping, getNameEscape, getOptimizedBounds, getPkColumnValue, getPrimaryKey, getRestrictions, getResultTypes, getSQLType, handleSelectHints, isArray, isAutoCommitQuery, isGroupBySupported, ne, postCreateAttribute, postCreateFeatureType, registerAggregateFunctions, registerSqlTypeToClassMappings, splitFilter, supportsSchemaForIndex, unwrapConnection
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Constructor Detail
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H2GISPSDialect
public H2GISPSDialect(JDBCDataStore store, H2GISDialect delegate)
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Method Detail
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isAggregatedSortSupported
public boolean isAggregatedSortSupported(String function)
Description copied from class:SQLDialect
Returns true if this dialect supports sorting together with the given aggregation function.- Overrides:
isAggregatedSortSupported
in classSQLDialect
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includeTable
public boolean includeTable(String schemaName, String tableName, Connection cx)
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.
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decodeGeometryEnvelope
public Envelope decodeGeometryEnvelope(ResultSet rs, int column, Connection cx) throws SQLException
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
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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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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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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
, orasWKB
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 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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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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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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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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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)
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:
columnMetaData
- 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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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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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 classSQLDialect
- Parameters:
schemaName
- The schema name, this might benull
.tableName
- The name of the table.columnName
- The column.cx
- The database connection.- Returns:
- The next value of the column, or
null
. - Throws:
SQLException
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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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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 classSQLDialect
- Parameters:
schemaName
- The schema name, this might benull
.sequenceName
- The name of the sequence.cx
- The database connection.- Returns:
- The next value of the sequence, or
null
. - Throws:
SQLException
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encodeNextSequenceValue
public String encodeNextSequenceValue(String schemaName, String sequenceName)
Description copied from class:SQLDialect
Encodes how to get the next sequence value from the DB.Implementations should handle the case where schemaName is
null
.- Overrides:
encodeNextSequenceValue
in classSQLDialect
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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 classSQLDialect
- Parameters:
schemaName
- The schema name, this might benull
.tableName
- The table name.columnName
- The column name.cx
- The database connection.- Throws:
SQLException
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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 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
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preDropTable
public void preDropTable(String schemaName, SimpleFeatureType featureType, Connection cx) throws SQLException
Description copied from class:SQLDialect
Callback which executes before a table is about to be dropped.This base implementation does nothing, subclasses should override as need be.
- Overrides:
preDropTable
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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postDropTable
public void postDropTable(String schemaName, SimpleFeatureType featureType, Connection cx)
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.
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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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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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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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handleUserDefinedType
public void handleUserDefinedType(ResultSet columnMetaData, ColumnMetadata metadata, Connection cx) throws SQLException
Description copied from class:SQLDialect
Handles the mapping for a user defined type.This method is called after
SQLDialect.getMapping(ResultSet, Connection)
but before the rest of the type mapping heuristics are applied.Implementing this method is optional. It is used to allow for handling user defined types or "DOMAINS". Dialects that implement this method should set the appropriate information on the metadata object to allow the column to be mapped via the regular type mapping heuristics.
- Overrides:
handleUserDefinedType
in classSQLDialect
- Parameters:
columnMetaData
- The column metdata.metadata
- The column metadata object that collections mapping information.cx
- The database connection, not to be closed.- Throws:
SQLException
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prepareGeometryValue
public void prepareGeometryValue(Class<? extends Geometry> gClass, int dimension, int srid, Class binding, StringBuffer sql)
Description copied from class:PreparedStatementSQLDialect
Prepares the geometry value for a prepared statement.This method should be overridden if the implementation needs to wrap the geometry placeholder in the function. The default implementationg just appends the default placeholder: '?'.
- Overrides:
prepareGeometryValue
in classPreparedStatementSQLDialect
- Parameters:
gClass
- The geometry class.dimension
- The dimensions (2,3,4) of the coordinates, or -1 if unknownsrid
- The spatial reference system of the geometry, or -1 if unknownbinding
- The class of the geometry.sql
- The prepared sql statement buffer.
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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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createPreparedFilterToSQL
public PreparedFilterToSQL createPreparedFilterToSQL()
- Overrides:
createPreparedFilterToSQL
in classPreparedStatementSQLDialect
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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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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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getArrayComponentTypeName
protected String getArrayComponentTypeName(AttributeDescriptor att) throws SQLException
Description copied from class:PreparedStatementSQLDialect
Given the full information about the attribute being transformed, figure out the native SQL Type Name to use when creating a SQL Array object· The default implementation just scansJDBCDataStore.getSqlTypeNameToClassMappings()
backwards, and will fail in case there are ambiguities. Subclasses can implement their own logic and eventually use information contained in the attribute'sPropertyDescriptor.getUserData()
, stored at attribute creation time.- Overrides:
getArrayComponentTypeName
in classPreparedStatementSQLDialect
- Throws:
SQLException
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encodeGeometryColumnSimplified
public void encodeGeometryColumnSimplified(GeometryDescriptor gatt, String prefix, int srid, StringBuffer sql, Double distance)
- Overrides:
encodeGeometryColumnSimplified
in classSQLDialect
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encodeGeometryColumnGeneralized
public void encodeGeometryColumnGeneralized(GeometryDescriptor gatt, String prefix, int srid, StringBuffer sql, Double distance)
- Overrides:
encodeGeometryColumnGeneralized
in classSQLDialect
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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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canSimplifyPoints
public boolean canSimplifyPoints()
Description copied from class:SQLDialect
Returns if points can be returned in simplified form (e.g reduced precision, like TWKB encoding)- Overrides:
canSimplifyPoints
in classSQLDialect
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