Docs For Class SparqlEngineDb

Description

SPARQL engine optimized for databases.

Generates SQL statements to directly query the database, letting the database system do all the hard work like selecting, joining, filtering and ordering results.

author: Christian Weiske <cweiske@cweiske.de>

Located in /sparql/SparqlEngineDb.php (line 18)

Variable Summary

array $arPrepared

boolean $bRealPrepared

Dataset $dataset

ADOConnection $dbConn

int $modelID

SparqlEngineDb_Preparator $pr

Query $query

SparqlEngineDb_SqlGenerator $sg

SparqlEngineDb_TypeSorter $ts

Method Summary

SparqlEngineDb __construct ( $model)

mixed execute (array $arVariables, [string $resultform = false])

void getQuery ()

void getSqlGenerator ()

void getTypeSorter ()

SparqlEngineDb_PreparedStatement prepare ( $dataset, Query $query)

mixed queryDb (array $arSql, $nOffset, $nLimit)

array/string queryModel ( $dataset, Query $query, [string $resultform = false])

array queryMultiple (array $arSqls)

Variables

array $arPrepared = null (line 50)

Prepared SQL statements are stored in here.

access: protected

boolean $bRealPrepared = false (line 56)

If the prepared statement is really prepared, or if we just emulate it.

access: protected

Dataset $dataset (line 31)

RDF dataset object.

access: protected

ADOConnection $dbConn (line 37)

Database connection object.

access: protected

int $modelID (line 44)

Internal ID for our graph model.

Stored in the database along the statements.

access: protected

SparqlEngineDb_Preparator $pr = null (line 74)

Prepared statments preparator instance

access: protected

Query $query (line 25)

Sparql Query object.

access: protected

SparqlEngineDb_SqlGenerator $sg = null (line 62)

SQL generator instance

access: protected

SparqlEngineDb_TypeSorter $ts = null (line 68)

Type sorting instance

access: protected

Methods

Constructor __construct (line 81)

Use SparqlEngine::factory() to create the instance

access: public

SparqlEngineDb __construct ( $model)

DbModel $model

execute (line 189)

Execute a prepared statement by filling it with variables

return: Result according to $resultform
access: public

mixed execute (array $arVariables, [string $resultform = false])

array $arVariables: Array with (variable name => value) pairs
string $resultform: Which form the result should have

getQuery (line 329)

access: public

void getQuery ()

getSqlGenerator (line 336)

access: public

void getSqlGenerator ()

getTypeSorter (line 343)

access: public

void getTypeSorter ()

prepare (line 142)

Create a prepared statement that can be executed later.

return: Prepared statment that can be execute()d later.
access: public

SparqlEngineDb_PreparedStatement prepare ( $dataset, Query $query)

Dataset $dataset: RDF Dataset
Query $query: Parsed SPARQL query

queryDb (line 287)

Sends the sql to the database and returns the results.

return: Anything ADOConnection::Execute() may return
throws: Exception If Database query does not work

mixed queryDb (array $arSql, $nOffset, $nLimit)

array $arSql: Array that gets a SQL query string once imploded
$nOffset
$nLimit

queryModel (line 102)

Query the database with the given SPARQL query.

return: array of triple arrays, or XML. Format depends on $resultform parameter.
access: public

array/string queryModel ( $dataset, Query $query, [string $resultform = false])

Dataset $dataset: RDF Dataset
Query $query: Parsed SPARQL query
string $resultform: Result form. If set to 'xml' the result will be SPARQL Query Results XML Format as described in http://www.w3.org/TR/rdf-sparql-XMLres/ .

queryMultiple (line 235)

Executes multiple SQL queries and returns an array of results.

return: Array of query results
access: protected

array queryMultiple (array $arSqls)

array $arSqls: Array of SQL queries