org.geotools.data.h2
Class H2DialectPrepared

Object
  SQLDialect
      PreparedStatementSQLDialect
          H2DialectPrepared

public class H2DialectPrepared
extends PreparedStatementSQLDialect

H2 database dialect based on prepared statements.

Author:

Justin Deoliveira, OpenGEO

Field Summary

Fields inherited from class SQLDialect

BASE_DBMS_CAPABILITIES, dataStore, LOGGER

Constructor Summary

protected

H2DialectPrepared(JDBCDataStore dataStore)

Method Summary

void	applyLimitOffset(StringBuffer sql, int limit, int offset) Alters the query provided so that limit and offset are natively dealt with.
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.
void	encodePostColumnCreateTable(AttributeDescriptor att, StringBuffer sql) Encodes anything post a column in a CREATE TABLE statement.
void	encodePostCreateTable(String tableName, StringBuffer sql) Encodes anything post a CREATE TABLE statement.
void	encodePrimaryKey(String column, StringBuffer sql) Encodes the primary key definition in a CREATE TABLE statement.
Integer	getGeometrySRID(String schemaName, String tableName, String columnName, Connection cx) Returns the spatial reference system identifier (srid) for a particular geometry column.
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.
String	getNameEscape() Returns the string used to escape names.
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.
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	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 metadata, String schemaName, 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
void	registerSqlTypeToClassMappings(Map<Integer,Class<?>> mappings) Registers the sql type to java type mappings that the dialect uses when reading and writing objects to and from the database.
void	setGeometryValue(Geometry g, int srid, Class binding, PreparedStatement ps, int column) Sets the geometry value into the prepared statement.

Methods inherited from class PreparedStatementSQLDialect

createPreparedFilterToSQL, onDelete, onInsert, onSelect, onUpdate, prepareFunctionArgument, prepareGeometryValue, setValue

Methods inherited from class SQLDialect

addSupportedHints, createCRS, decodeGeometryValue, encodeColumnAlias, encodeColumnName, encodeColumnName, encodeColumnType, encodeGeometryColumn, encodeGeometryColumn, encodeGeometryColumn, encodeGeometryColumnGeneralized, encodeGeometryColumnGeneralized, encodeGeometryColumnSimplified, encodeGeometryColumnSimplified, encodeJoin, encodePostSelect, encodeSchemaName, encodeTableAlias, encodeTableName, getDefaultVarcharSize, getGeometryTypeName, getOptimizedBounds, handleUserDefinedType, isAutoCommitQuery, ne, postCreateAttribute, registerAggregateFunctions, registerSqlTypeNameToClassMappings, registerSqlTypeToSqlTypeNameOverrides

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

H2DialectPrepared

protected H2DialectPrepared(JDBCDataStore dataStore)

Method Detail

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 class SQLDialect

Parameters:

cx - The new database connection.

Throws:

SQLException

includeTable

public boolean includeTable(String schemaName,
                            String tableName,
                            Connection cx)
                     throws SQLException

Description copied from class: SQLDialect

Determines if the specified table should be included in those published by the datastore.

This method returns true if the table should be published as a feature type, otherwise it returns false. Subclasses should override this method, this default implementation returns true.

A database connection is provided to the dialect but it should not be closed. However any statements objects or result sets that are instantiated from it must be closed.

Overrides:

includeTable in class SQLDialect

Parameters:

schemaName - The schema of the table, might be null..

tableName - The name of the table.

cx - Database connection.

Throws:

SQLException

getNameEscape

public String getNameEscape()

Description copied from class: SQLDialect

Returns the string used to escape names.

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

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

Overrides:

getNameEscape in class SQLDialect

registerSqlTypeToClassMappings

public void registerSqlTypeToClassMappings(Map<Integer,Class<?>> mappings)

Description copied from class: SQLDialect

Registers the sql type 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:

registerSqlTypeToClassMappings 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

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

encodePostColumnCreateTable

public void encodePostColumnCreateTable(AttributeDescriptor att,
                                        StringBuffer sql)

Description copied from class: SQLDialect

Encodes anything post a column in a CREATE TABLE statement.

This is appended after the column name and type. Subclasses may choose to override this method, the default implementation does nothing.

Overrides:

encodePostColumnCreateTable in class SQLDialect

Parameters:

att - The attribute corresponding to the column.

encodePostCreateTable

public void encodePostCreateTable(String tableName,
                                  StringBuffer sql)

Description copied from class: SQLDialect

Encodes anything post a CREATE TABLE statement.

This is appended to a CREATE TABLE statement after the column definitions. This default implementation does nothing, subclasses should override as need be.

Overrides:

encodePostCreateTable in class SQLDialect

postCreateTable

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

Description copied from class: SQLDialect

Callback to execute any additional sql statements post a create table statement.

This method should be implemented by subclasses that need to do some post processing on the database after a table has been created. Examples might include:

• Creating a sequence for a primary key
• Registering geometry column metadata
• Creating a spatial index

A common case is creating an auto incrementing sequence for the primary key of a table. It should be noted that all tables created through the datastore use the column "fid" as the primary key.

A direct connection to the database is provided (cx). This connection must not be closed, however any statements or result sets instantiated from the connection must be closed.

Overrides:

postCreateTable in class SQLDialect

Parameters:

schemaName - The name of the schema, may be null.

featureType - The feature type that has just been created on the database.

cx - Database connection.

Throws:

SQLException

postCreateFeatureType

public void postCreateFeatureType(SimpleFeatureType featureType,
                                  DatabaseMetaData metadata,
                                  String schemaName,
                                  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.

metadata - The database metadata.

schemaName - The name of the database scheam containing the table containing the column

cx - The database connection.

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

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 class SQLDialect

getSequenceForColumn

public String getSequenceForColumn(String schemaName,
                                   String tableName,
                                   String columnName,
                                   Connection cx)
                            throws SQLException

Description copied from class: SQLDialect

Determines the name of the sequence (if any) which is used to increment generate values for a table column.

This method should return null if no such sequence exists.

This method is given a direct connection to the database, but this connection should never be closed. However any statements or result sets instantiated from the connection must be closed.

Overrides:

getSequenceForColumn in class SQLDialect

Parameters:

schemaName - The schema name, this might be null.

tableName - The table name.

columnName - The column name.

cx - The database connection.

Throws:

SQLException

getNextSequenceValue

public Object getNextSequenceValue(String schemaName,
                                   String sequenceName,
                                   Connection cx)
                            throws SQLException

Description copied from class: SQLDialect

Obtains the next value of a sequence, incrementing the sequence to the next state in the process.

Implementations should determine the next value of a column for which values are automatically generated by the database.

This method is given a direct connection to the database, but this connection should never be closed. However any statements or result sets instantiated from the connection must be closed.

Implementations should handle the case where schemaName is null.

Overrides:

getNextSequenceValue in class SQLDialect

Parameters:

schemaName - The schema name, this might be null.

sequenceName - The name of the sequence.

cx - The database connection.

Returns:

The next value of the sequence, or null.

Throws:

SQLException

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

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 class SQLDialect

Parameters:

schemaName - The schema name, this might be null.

tableName - The name of the table.

columnName - The column.

cx - The database connection.

Returns:

The next value of the column, or null.

Throws:

SQLException

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 class SQLDialect

Parameters:

schemaName - The schema name, this might be null.

tableName - The name of the table.

columnName - The column.

cx - The database connection.

Returns:

The previous value of the column, or null.

Throws:

SQLException

encodeGeometryEnvelope

public void encodeGeometryEnvelope(String tableName,
                                   String geometryColumn,
                                   StringBuffer sql)

Description copied from class: SQLDialect

Encodes the spatial extent function of a geometry column in a SELECT statement.

This method must also be sure to properly encode the name of the column with the SQLDialect.encodeColumnName(String, StringBuffer) function.

Specified by:

encodeGeometryEnvelope in class SQLDialect

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

setGeometryValue

public void setGeometryValue(Geometry g,
                             int srid,
                             Class binding,
                             PreparedStatement ps,
                             int column)
                      throws SQLException

Description copied from class: PreparedStatementSQLDialect

Sets the geometry value into the prepared statement.

Specified by:

setGeometryValue in class PreparedStatementSQLDialect

Parameters:

g - The geometry

srid - the geometry native srid (should be forced into the encoded geometry)

binding - the geometry type

ps - the prepared statement

column - the column index where the geometry is to be set

Throws:

SQLException

decodeGeometryValue

public Geometry decodeGeometryValue(GeometryDescriptor descriptor,
                                    ResultSet rs,
                                    String column,
                                    GeometryFactory factory,
                                    Connection cx)
                             throws IOException,
                                    SQLException

Description copied from class: SQLDialect

Decodes a geometry value from the result of a query.

This method is given direct access to a result set. The column parameter is the index into the result set which contains the geometric value.

An implementation should deserialize the value provided by the result set into Geometry object. For example, consider an implementation which deserializes from well known text:

   String wkt = rs.getString( column );
   if ( wkt == null ) {
     return null;
   }
   return new WKTReader(factory).read( wkt );
   

Note that implementations must handle null values.

The factory parameter should be used to instantiate any geometry objects.

Specified by:

decodeGeometryValue in class SQLDialect

Throws:

IOException

SQLException

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