org.alfresco.repo.domain.query

Interface CannedQueryDAO

All Known Implementing Classes:

AbstractCannedQueryDAOImpl, CannedQueryDAOImpl

public interface CannedQueryDAO

DAO services for general-use database canned queries. Note that this is specifically targeted at low-level queries to the persistance layer.

Since:

3.5

Author:

Derek Hulley

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	CannedQueryDAO.ResultHandler<R> A simple, typed results handler.

Method Summary

Modifier and Type	Method and Description
Long	executeCountQuery(String sqlNamespace, String queryName, Object parameterObj) Execute a count(*)-style query returning a count value.
<R> List<R>	executeQuery(String sqlNamespace, String queryName, Object parameterObj, int offset, int limit) Execute a query that returns one or more results.
<R> void	executeQuery(String sqlNamespace, String queryName, Object parameterObj, int offset, int limit, CannedQueryDAO.ResultHandler<R> handler) Execute a query that returns one or more results, processing the results using a handler.
<R> R	executeQueryUnique(String sqlNamespace, String queryName, Object parameterObj) Execute a query that returns exactly one result.

Method Detail

executeCountQuery

Long executeCountQuery(String sqlNamespace,
                       String queryName,
                       Object parameterObj)

Execute a count(*)-style query returning a count value. The implementation will ensure that null is substituted with 0, if required.

All exceptions can be safely caught and handled as required.

Parameters:

sqlNamespace - the query namespace (defined by config file) e.g. alfresco.query.usage

queryName - the name of the query e.g. select_userCount

parameterObj - the values to drive the selection (may be null if not required)

Returns:

a non-null count

Throws:

QueryException - if the query returned multiple results

executeQueryUnique

<R> R executeQueryUnique(String sqlNamespace,
                         String queryName,
                         Object parameterObj)

Execute a query that returns exactly one result. The assumption is that the parameters provided uniquely identify the object.

Type Parameters:

R - the return value's type

Parameters:

sqlNamespace - the query namespace (defined by config file) e.g. alfresco.query.usage

queryName - the name of the query e.g. select_userCount

parameterObj - the values to drive the selection (may be null if not required)

Returns:

the unique result (never null)

Throws:

IllegalArgumentException - concurrency-related exception if a single object was not found

executeQuery

<R> List<R> executeQuery(String sqlNamespace,
                         String queryName,
                         Object parameterObj,
                         int offset,
                         int limit)

Execute a query that returns one or more results.

Type Parameters:

R - the return value's type

Parameters:

sqlNamespace - the query namespace (defined by config file) e.g. alfresco.query.usage

queryName - the name of the query e.g. select_userCount

parameterObj - the values to drive the selection (may be null if not required)

offset - the number of results to skip

limit - the maximum number of results to retrieve or Integer.MAX_VALUE for no limit

Returns:

the list of results

executeQuery

<R> void executeQuery(String sqlNamespace,
                      String queryName,
                      Object parameterObj,
                      int offset,
                      int limit,
                      CannedQueryDAO.ResultHandler<R> handler)

Execute a query that returns one or more results, processing the results using a handler.

Type Parameters:

R - the return value's type

Parameters:

sqlNamespace - the query namespace (defined by config file) e.g. alfresco.query.usage

queryName - the name of the query e.g. select_userCount

parameterObj - the values to drive the selection (may be null if not required)

offset - the number of results to skip

limit - the maximum number of results to retrieve or Integer.MAX_VALUE for no limit