org.apache.jackrabbit.oak.api

Interface QueryEngine

public interface QueryEngine

The query engine allows to parse and execute queries.

What query languages are supported depends on the registered query parsers.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	INTERNAL_SQL2_QUERY The suffix for internal SQL-2 statements.
static java.util.Map<java.lang.String,PropertyValue>	NO_BINDINGS Empty set of variables bindings.
static java.util.Map<java.lang.String,java.lang.String>	NO_MAPPINGS Empty set of namespace prefix mappings.

Method Summary

Modifier and Type	Method and Description
Result	executeQuery(java.lang.String statement, java.lang.String language, long limit, long offset, java.util.Map<java.lang.String,? extends PropertyValue> bindings, java.util.Map<java.lang.String,java.lang.String> mappings) Execute a query and get the result.
Result	executeQuery(java.lang.String statement, java.lang.String language, java.util.Map<java.lang.String,? extends PropertyValue> bindings, java.util.Map<java.lang.String,java.lang.String> mappings) Execute a query and get the result.
java.util.List<java.lang.String>	getBindVariableNames(java.lang.String statement, java.lang.String language, java.util.Map<java.lang.String,java.lang.String> mappings) Parse the query (check if it's valid) and get the list of bind variable names.
java.util.Set<java.lang.String>	getSupportedQueryLanguages() Get the set of supported query languages.

Field Detail

INTERNAL_SQL2_QUERY

static final java.lang.String INTERNAL_SQL2_QUERY

The suffix for internal SQL-2 statements. Those are logged with trace level instead of debug level.

See Also:

Constant Field Values

NO_BINDINGS

static final java.util.Map<java.lang.String,PropertyValue> NO_BINDINGS

Empty set of variables bindings. Useful as an argument to executeQuery(String, String, long, long, Map, Map) when there are no variables in a query.

NO_MAPPINGS

static final java.util.Map<java.lang.String,java.lang.String> NO_MAPPINGS

Empty set of namespace prefix mappings. Useful as an argument to getBindVariableNames(String, String, Map) and executeQuery(String, String, long, long, Map, Map) when there are no local namespace mappings.

Method Detail

getSupportedQueryLanguages

java.util.Set<java.lang.String> getSupportedQueryLanguages()

Get the set of supported query languages.

Returns:

the supported query languages

getBindVariableNames

java.util.List<java.lang.String> getBindVariableNames(java.lang.String statement,
                                                      java.lang.String language,
                                                      java.util.Map<java.lang.String,java.lang.String> mappings)
                                               throws java.text.ParseException

Parse the query (check if it's valid) and get the list of bind variable names.

Parameters:

statement - query statement

language - query language

mappings - namespace prefix mappings

Returns:

the list of bind variable names

Throws:

java.text.ParseException

executeQuery

Result executeQuery(java.lang.String statement,
                    java.lang.String language,
                    long limit,
                    long offset,
                    java.util.Map<java.lang.String,? extends PropertyValue> bindings,
                    java.util.Map<java.lang.String,java.lang.String> mappings)
             throws java.text.ParseException

Execute a query and get the result.

Parameters:

statement - the query statement

language - the language

limit - the maximum result set size (may not be negative)

offset - the number of rows to skip (may not be negative)

bindings - the bind variable value bindings

mappings - namespace prefix mappings

Returns:

the result

Throws:

java.text.ParseException - if the statement could not be parsed

java.lang.IllegalArgumentException - if there was an error executing the query

executeQuery

Result executeQuery(java.lang.String statement,
                    java.lang.String language,
                    java.util.Map<java.lang.String,? extends PropertyValue> bindings,
                    java.util.Map<java.lang.String,java.lang.String> mappings)
             throws java.text.ParseException

Execute a query and get the result. This is a convenience method: no limit, and offset 0.

Parameters:

statement - the query statement

language - the language

bindings - the bind variable value bindings

mappings - namespace prefix mappings

Returns:

the result

Throws:

java.text.ParseException - if the statement could not be parsed

java.lang.IllegalArgumentException - if there was an error executing the query