SQLServerDialect (Geotools modules 21.0 API)

Object
- SQLDialect
- - BasicSQLDialect
  - - SQLServerDialect

Direct Known Subclasses:

JTDSSQLServerDialect
```
public class SQLServerDialect
extends BasicSQLDialect
```
Dialect implementation for Microsoft SQL Server.

Author:

Justin Deoliveira, OpenGEO

Field Summary
- Fields inherited from class SQLDialect
  BASE_DBMS_CAPABILITIES, dataStore, LOGGER

Constructor Summary

Constructors
Constructor and Description

SQLServerDialect(JDBCDataStore dataStore)

Constructors
Constructor and Description
`SQLServerDialect(JDBCDataStore dataStore)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`applyLimitOffset(StringBuffer sql, int limit, int offset)` Alters the query provided so that limit and offset are natively dealt with.
`FilterToSQL`	`createFilterToSQL()` Creates the filter encoder to be used by the datastore when encoding query predicates.
`Envelope`	`decodeGeometryEnvelope(ResultSet rs, int column, Connection cx)` Decodes the result of a spatial extent function in a SELECT statement.
`Geometry`	`decodeGeometryValue(GeometryDescriptor descriptor, ResultSet rs, String column, GeometryFactory factory, Connection cx, Hints hints)` Decodes a geometry value from the result of a query.
`void`	`dropIndex(Connection cx, SimpleFeatureType schema, String databaseSchema, String indexName)` Drop the index.
`protected void`	`encodeAggregateFunction(String function, String column, StringBuffer sql)`
`void`	`encodeGeometryColumn(GeometryDescriptor gatt, String prefix, int srid, Hints hints, StringBuffer sql)` Encodes the name of a geometry column in a SELECT statement.
`void`	`encodeGeometryEnvelope(String tableName, String geometryColumn, StringBuffer sql)` Encodes the spatial extent function of a geometry column in a SELECT statement.
`void`	`encodeGeometryValue(Geometry value, int dimension, int srid, StringBuffer sql)` Encodes a geometry value in an sql statement.
`protected void`	`encodeTableName(String schemaName, String tableName, StringBuffer sql, boolean escape)`
`void`	`encodeValue(Object value, Class type, StringBuffer sql)` Encodes a value in an sql statement.
`int`	`getGeometryDimension(String schemaName, String tableName, String columnName, Connection cx)` Returns the dimension of the coordinates in the geometry.
`Integer`	`getGeometryDimensionFromMetadataTable(String schemaName, String tableName, String columnName, Connection cx)`
`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.
`Integer`	`getGeometrySRIDfromMetadataTable(String schemaName, String tableName, String columnName, Connection cx)`
`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, Statement st)` 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.
`void`	`handleSelectHints(StringBuffer sql, SimpleFeatureType featureType, Query query)` Used to apply search hints on the fully generated SQL (complete of select, from, where, sort, limit/offset)
`boolean`	`includeTable(String schemaName, String tableName, Connection cx)` Determines if the specified table should be included in those published by the datastore.
`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`	`postCreateFeatureType(SimpleFeatureType featureType, DatabaseMetaData md, String databaseSchema, Connection cx)` Callback which executes after a feature type has been built from a database table.
`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. * Subclasses should extend (not override) this method to provide additional mappings, or to override mappings provided by this implementation.
`void`	`registerFunctions(Map<String,String> functions)` Register the dialect mappings between Geotools FilterFunction names and database related function.
`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`	`setForceSpatialIndexes(boolean forceSpatialIndexes)` Sets whether to force the usage of spatial indexes by including a WITH INDEX hint
`void`	`setGeometryMetadataTable(String geometryMetadataTable)` Sets the geometry metadata table
`void`	`setTableHints(String tableHints)` Sets a comma separated list of table hints that will be added to every select query
`void`	`setUseNativeSerialization(Boolean useNativeSerialization)` Sets whether to use native SQL Server binary serialization or WKB serialization
`void`	`setUseOffSetLimit(Boolean useOffsetLimit)` Sets whether to use offset limit or not

Methods inherited from class BasicSQLDialect
onDelete, onInsert, onSelect, onUpdate

Methods inherited from class SQLDialect
addSupportedHints, createCRS, createIndex, decodeGeometryValue, encodeAggregateFunctionPostfix, encodeAggregateFunctionPrefix, encodeColumnAlias, encodeColumnName, encodeColumnName, encodeColumnType, encodeCreateTable, encodeGeometryColumn, encodeGeometryColumn, encodeGeometryColumnGeneralized, encodeGeometryColumnGeneralized, encodeGeometryColumnSimplified, encodeGeometryColumnSimplified, encodeJoin, encodeNextSequenceValue, encodePostColumnCreateTable, encodePostCreateTable, encodePostSelect, encodePrimaryKey, encodeSchemaName, encodeTableAlias, encodeTableName, getDefaultVarcharSize, getDesiredTablesType, getIndexes, getLastAutoGeneratedValue, getNameEscape, getNextAutoGeneratedValue, getNextSequenceValue, getOptimizedBounds, getPkColumnValue, getPrimaryKey, getSequenceForColumn, handleUserDefinedType, initializeConnection, isAggregatedSortSupported, isAutoCommitQuery, isGroupBySupported, ne, postCreateAttribute, postDropTable, preDropTable, registerAggregateFunctions, registerSqlTypeToClassMappings, splitFilter, supportsSchemaForIndex

Methods inherited from class Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - SQLServerDialect
```
public SQLServerDialect(JDBCDataStore dataStore)
```
- Method Detail
  - registerFunctions
```
public void registerFunctions(Map<String,String> functions)
```
    Description copied from class: SQLDialect
    
    Register the dialect mappings between Geotools FilterFunction names and database related function.
    
    Overrides:
    
    registerFunctions in class SQLDialect
    
    Parameters:
    
    functions - mappings from GT FilterFunction name to sql function name
  - encodeAggregateFunction
```
protected void encodeAggregateFunction(String function,
                                       String column,
                                       StringBuffer sql)
```
    Overrides:
    
    encodeAggregateFunction in class SQLDialect
  - includeTable
```
public boolean includeTable(String schemaName,
                            String tableName,
                            Connection cx)
                     throws SQLException
```
    Description copied from class: SQLDialect
    
    Determines if the specified table should be included in those published by the datastore.
    This method returns true if the table should be published as a feature type, otherwise it returns false. Subclasses should override this method, this default implementation returns true.
    A database connection is provided to the dialect but it should not be closed. However any statements objects or result sets that are instantiated from it must be closed.
    Overrides: includeTable in class SQLDialect Parameters: schemaName - The schema of the table, might be null.. tableName - The name of the table. cx - Database connection. Throws: SQLException
  getGeometryTypeName public String getGeometryTypeName(Integer type) Description copied from class: SQLDialect Returns the name of a geometric type based on its integer constant. The constant, type, is registered in SQLDialect.registerSqlTypeNameToClassMappings(Map). This default implementation returns null, subclasses should override. Overrides: getGeometryTypeName in class SQLDialect registerClassToSqlMappings public void registerClassToSqlMappings(Map<Class<?>,Integer> mappings) Description copied from class: SQLDialect Registers the java type to sql type mappings that the datastore uses when reading and writing objects to and from the database. * Subclasses should extend (not override) this method to provide additional mappings, or to override mappings provided by this implementation. This implementation provides the following mappings: Overrides: registerClassToSqlMappings in class SQLDialect registerSqlTypeNameToClassMappings public void registerSqlTypeNameToClassMappings(Map<String,Class<?>> mappings) Description copied from class: SQLDialect Registers the sql type name to java type mappings that the dialect uses when reading and writing objects to and from the database. Subclasses should extend (not override) this method to provide additional mappings, or to override mappings provided by this implementation. This implementation provides the following mappings: Overrides: registerSqlTypeNameToClassMappings in class SQLDialect registerSqlTypeToSqlTypeNameOverrides public void registerSqlTypeToSqlTypeNameOverrides(Map<Integer,String> overrides) Description copied from class: SQLDialect Registers any overrides that should occur when mapping an integer sql type value to an underlying sql type name. The default implementation of this method does nothing. Subclasses should override in cases where: database type metadata does not provide enough information to properly map to support custom types (those not in Types) Overrides: registerSqlTypeToSqlTypeNameOverrides in class SQLDialect postCreateTable public void postCreateTable(String schemaName, SimpleFeatureType featureType, Connection cx) throws SQLException, IOException Description copied from class: SQLDialect Callback to execute any additional sql statements post a create table statement. This method should be implemented by subclasses that need to do some post processing on the database after a table has been created. Examples might include: Creating a sequence for a primary key Registering geometry column metadata Creating a spatial index A common case is creating an auto incrementing sequence for the primary key of a table. It should be noted that all tables created through the datastore use the column "fid" as the primary key. A direct connection to the database is provided (cx). This connection must not be closed, however any statements or result sets instantiated from the connection must be closed. Overrides: postCreateTable in class SQLDialect Parameters: schemaName - The name of the schema, may be null. featureType - The feature type that has just been created on the database. cx - Database connection. Throws: SQLException IOException 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 getGeometrySRIDfromMetadataTable public Integer getGeometrySRIDfromMetadataTable(String schemaName, String tableName, String columnName, Connection cx) throws SQLException Throws: SQLException 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 getGeometryDimensionFromMetadataTable public Integer getGeometryDimensionFromMetadataTable(String schemaName, String tableName, String columnName, Connection cx) throws SQLException Throws: SQLException 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 class SQLDialect Parameters: schemaName - The database schema, could be null. tableName - The table, never null. columnName - The column name, never null cx - The database connection. Throws: SQLException encodeGeometryColumn public void encodeGeometryColumn(GeometryDescriptor gatt, 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, or asWKB when fetching a geometry. This method must also be sure to properly encode the name of the column with the SQLDialect.encodeColumnName(String, String, StringBuffer) function. Example: sql.append( "asText(" ); column( gatt.getLocalName(), sql ); sql.append( ")" ); This default implementation calls the deprecated SQLDialect.encodeGeometryColumn(GeometryDescriptor, String, int, StringBuffer) version of this method for backward compatibility reasons. Overrides: encodeGeometryColumn in class SQLDialect encodeGeometryValue public void encodeGeometryValue(Geometry value, int dimension, int srid, StringBuffer sql) throws IOException Description copied from class: BasicSQLDialect Encodes a geometry value in an sql statement. An implementations should serialize value into some exchange format which will then be transported to the underlying database. For example, consider an implementation which converts a geometry into its well known text representation: sql.append( "GeomFromText('" ); sql.append( new WKTWriter().write( value ) ); sql.append( ")" ); The srid parameter is the spatial reference system identifier of the geometry, or 0 if not known. Attention should be paid to emtpy geometries (g.isEmtpy() == true) as they cannot be encoded in WKB and several databases fail to handle them property. Common treatment is to equate them to NULL Specified by: encodeGeometryValue in class BasicSQLDialect Throws: IOException 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 ); Note that implementations must handle null values. The factory parameter should be used to instantiate any geometry objects. Specified by: decodeGeometryValue in class SQLDialect Throws: IOException SQLException encodeGeometryEnvelope public void encodeGeometryEnvelope(String tableName, String geometryColumn, StringBuffer sql) Description copied from class: SQLDialect Encodes the spatial extent function of a geometry column in a SELECT statement. This method must also be sure to properly encode the name of the column with the SQLDialect.encodeColumnName(String, StringBuffer) function. Specified by: encodeGeometryEnvelope in class SQLDialect decodeGeometryEnvelope public Envelope decodeGeometryEnvelope(ResultSet rs, int column, Connection cx) throws SQLException, IOException Description copied from class: SQLDialect Decodes the result of a spatial extent function in a SELECT statement. This method is given direct access to a result set. The column parameter is the index into the result set which contains the spatial extent value. The query for this value is build with the SQLDialect.encodeGeometryEnvelope(String, String, StringBuffer) method. This method must not read any other objects from the result set other then the one referenced by column. Specified by: decodeGeometryEnvelope in class SQLDialect Parameters: rs - A result set column - Index into the result set which points at the spatial extent value. Throws: SQLException IOException createFilterToSQL public FilterToSQL createFilterToSQL() Description copied from class: BasicSQLDialect Creates the filter encoder to be used by the datastore when encoding query predicates. Sublcasses can override this method to return a subclass of FilterToSQL if need be. Overrides: createFilterToSQL in class BasicSQLDialect encodeTableName protected void encodeTableName(String schemaName, String tableName, StringBuffer sql, boolean escape) 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 encodeValue public void encodeValue(Object value, Class type, StringBuffer sql) Description copied from class: BasicSQLDialect Encodes a value in an sql statement. Subclasses may wish to override or extend this method to handle specific types. This default implementation does the following: The value is encoded via its Object.toString() representation. If type is a character type (extends CharSequence), it is wrapped in single quotes ('). Overrides: encodeValue in class BasicSQLDialect 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 - setUseOffSetLimit public void setUseOffSetLimit(Boolean useOffsetLimit) Sets whether to use offset limit or not Parameters: useOffsetLimit - setUseNativeSerialization public void setUseNativeSerialization(Boolean useNativeSerialization) Sets whether to use native SQL Server binary serialization or WKB serialization Parameters: useNativeSerialization - setForceSpatialIndexes public void setForceSpatialIndexes(boolean forceSpatialIndexes) Sets whether to force the usage of spatial indexes by including a WITH INDEX hint Parameters: useNativeSerialization - setTableHints public void setTableHints(String tableHints) Sets a comma separated list of table hints that will be added to every select query Parameters: tableHints - dropIndex public void dropIndex(Connection cx, SimpleFeatureType schema, String databaseSchema, String indexName) throws SQLException Drop the index. Subclasses can override to handle extra syntax or db specific situations Overrides: dropIndex in class SQLDialect Parameters: cx - schema - databaseSchema - indexName - Throws: SQLException postCreateFeatureType public void postCreateFeatureType(SimpleFeatureType featureType, DatabaseMetaData md, String databaseSchema, Connection cx) throws SQLException Description copied from class: SQLDialect Callback which executes after a feature type has been built from a database table. This base implementation does nothing, subclasses should override as need be. Overrides: postCreateFeatureType in class SQLDialect Parameters: featureType - The build feature type. md - The database metadata. databaseSchema - The name of the database scheam containing the table containing the column cx - The database connection. Throws: SQLException handleSelectHints public void handleSelectHints(StringBuffer sql, SimpleFeatureType featureType, Query query) Description copied from class: SQLDialect Used to apply search hints on the fully generated SQL (complete of select, from, where, sort, limit/offset) Overrides: handleSelectHints in class SQLDialect 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 via SQLDialect.getNextAutoGeneratedValue(String, String, String, Connection). Returning true will cause the lookup to occur after the insert via SQLDialect.getLastAutoGeneratedValue(String, String, String, Connection). Subclasses returning false should implement: SQLDialect.getNextAutoGeneratedValue(String, String, String, Connection) Subclasses returning true should implement: SQLDialect.getLastAutoGeneratedValue(String, String, String, Connection) Overrides: lookupGeneratedValuesPostInsert in class SQLDialect getLastAutoGeneratedValue public Object getLastAutoGeneratedValue(String schemaName, String tableName, String columnName, Connection cx, Statement st) 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 class SQLDialect Parameters: schemaName - The schema name, this might be null. tableName - The name of the table. columnName - The column. cx - The database connection. st - The statement used for the insert Returns: The previous value of the column, or null. Throws: SQLException

Class SQLServerDialect

Field Summary

Fields inherited from class SQLDialect

Constructor Summary

Method Summary

Methods inherited from class BasicSQLDialect

Methods inherited from class SQLDialect

Methods inherited from class Object

Constructor Detail

SQLServerDialect

Method Detail

registerFunctions

encodeAggregateFunction

includeTable

getGeometryTypeName

registerClassToSqlMappings

registerSqlTypeNameToClassMappings

registerSqlTypeToSqlTypeNameOverrides

postCreateTable

getMapping

getGeometrySRIDfromMetadataTable

getGeometrySRID

getGeometryDimensionFromMetadataTable

getGeometryDimension

encodeGeometryColumn

encodeGeometryValue

decodeGeometryValue

encodeGeometryEnvelope

decodeGeometryEnvelope

createFilterToSQL

encodeTableName

isLimitOffsetSupported

applyLimitOffset

encodeValue

getGeometryMetadataTable

setGeometryMetadataTable

setUseOffSetLimit

setUseNativeSerialization

setForceSpatialIndexes

setTableHints

dropIndex

postCreateFeatureType

handleSelectHints

lookupGeneratedValuesPostInsert

getLastAutoGeneratedValue