Package org.apache.jena.sparql.util

Class QueryExecUtils

java.lang.Object

org.apache.jena.sparql.util.QueryExecUtils

public class QueryExecUtils
extends java.lang.Object

Some utilities for query processing.

Constructor Summary

Constructors

Constructor	Description
QueryExecUtils()

Method Summary

Modifier and Type	Method	Description
static void	execute(Op op, DatasetGraph dsg)
static void	execute(Op op, DatasetGraph dsg, ResultsFormat outputFormat)
static void	execute(Op op, DatasetGraph dsg, ResultsFormat outputFormat, java.io.PrintStream output)
static void	executeQuery(QueryExecution queryExecution)
static void	executeQuery(Prologue prologue, QueryExecution queryExecution)
static void	executeQuery(Prologue prologue, QueryExecution queryExecution, ResultsFormat outputFormat)
static void	executeQuery(Prologue prologue, QueryExecution queryExecution, ResultsFormat outputFormat, java.io.PrintStream output)
static java.util.List<RDFNode>	getAll(QueryExecution qExec, java.lang.String varname)	Execute, returning all matches, which may be zero.
static RDFNode	getAtMostOne(QueryExecution qExec, java.lang.String varname)	Execute, expecting the result to be one row, one column.
static RDFNode	getExactlyOne(java.lang.String qs, Dataset ds)	Execute a query, expecting the result to be one row, one column.
static RDFNode	getExactlyOne(java.lang.String qs, Model model)	Execute a query, expecting the result to be one row, one column.
static RDFNode	getExactlyOne(QueryExecution qExec, java.lang.String varname)	Execute, expecting the result to be one row, one column.
static void	outputResultSet(ResultSet results, Prologue prologue, ResultsFormat outputFormat, java.io.PrintStream output)

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryExecUtils

public QueryExecUtils()

Method Detail

executeQuery

public static void executeQuery(QueryExecution queryExecution)

executeQuery

public static void executeQuery(Prologue prologue,
                                QueryExecution queryExecution)

executeQuery

public static void executeQuery(Prologue prologue,
                                QueryExecution queryExecution,
                                ResultsFormat outputFormat)

executeQuery

public static void executeQuery(Prologue prologue,
                                QueryExecution queryExecution,
                                ResultsFormat outputFormat,
                                java.io.PrintStream output)

execute

public static void execute(Op op,
                           DatasetGraph dsg)

execute

public static void execute(Op op,
                           DatasetGraph dsg,
                           ResultsFormat outputFormat)

execute

public static void execute(Op op,
                           DatasetGraph dsg,
                           ResultsFormat outputFormat,
                           java.io.PrintStream output)

outputResultSet

public static void outputResultSet(ResultSet results,
                                   Prologue prologue,
                                   ResultsFormat outputFormat,
                                   java.io.PrintStream output)

getExactlyOne

public static RDFNode getExactlyOne(java.lang.String qs,
                                    Model model)

Execute a query, expecting the result to be one row, one column. Return that one RDFNode

getExactlyOne

public static RDFNode getExactlyOne(java.lang.String qs,
                                    Dataset ds)

Execute a query, expecting the result to be one row, one column. Return that one RDFNode

getExactlyOne

public static RDFNode getExactlyOne(QueryExecution qExec,
                                    java.lang.String varname)

Execute, expecting the result to be one row, one column. Return that one. RDFNode or throw an exception. Use with try ( QueryExecution qExec = ....).

getAtMostOne

public static RDFNode getAtMostOne(QueryExecution qExec,
                                   java.lang.String varname)

Execute, expecting the result to be one row, one column. Return that one RDFNode or null. Throw exception if more than one. Use with try ( QueryExecution qExec = ....).

getAll

public static java.util.List<RDFNode> getAll(QueryExecution qExec,
                                             java.lang.String varname)

Execute, returning all matches, which may be zero.