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NCBI C++ ToolKit: CQueryExec Class Reference
Query execution environment holds the function registry and the execution context. More...
CQueryExec () virtual ~CQueryExec () void AddFunc (CQueryParseNode::EType func_type, CQueryFunctionBase *func) Register function implementation. More...
void AddImplicitSearchFunc (CQueryFunctionBase *func) This is a callback for implicit search nodes Our syntax allows queries like (a=1) AND "search_term" Execution recognises "search_term" connected with logical operation represents a special case. More...
CQueryFunctionBase * GetImplicitSearchFunc () CQueryFunctionBase * GetFunc (CQueryParseNode::EType func_type) Return query function pointer (if registered). More...
virtual void CallFunction (const string &name, CQueryParseTree::TNode &node) Extend this function to look up and invoke functions that appear in the query. More...
virtual void Evaluate (CQueryParseTree &qtree) Run query tree evaluation. More...
virtual void Evaluate (CQueryParseTree &qtree, CQueryParseTree::TNode &node) virtual bool ResolveIdentifier (const std::string &, bool &) If query has an identifier, this will resolve it in an application-specific way. More...
virtual bool ResolveIdentifier (const std::string &, Int8 &) virtual bool ResolveIdentifier (const std::string &, double &) virtual bool ResolveIdentifier (const std::string &, std::string &) virtual bool ResolveIdentifier (const TFieldID &, bool &) virtual bool ResolveIdentifier (const TFieldID &, Int8 &) virtual bool ResolveIdentifier (const TFieldID &, double &) virtual bool ResolveIdentifier (const TFieldID &, std::string &) virtual bool HasIdentifier (const std::string &) virtual TFieldID GetIdentifier (const std::string &) virtual CQueryParseNode::EType IdentifierType (const std::string &) Some applications may know the type of an identifier. More...
virtual void EvalStart () virtual bool EvalNext (CQueryParseTree &) Move to (iterate) to next entry. More...
virtual bool EvalComplete () int GetQueriedCount () const int GetExceptionCount () const CObject (void) Constructor. More...
CObject (const CObject &src) Copy constructor. More...
virtual ~CObject (void) Destructor. More...
CObject & operator= (const CObject &src) THROWS_NONE Assignment operator. More...
bool CanBeDeleted (void) const THROWS_NONE Check if object can be deleted. More...
bool IsAllocatedInPool (void) const THROWS_NONE Check if object is allocated in memory pool (not system heap) More...
bool Referenced (void) const THROWS_NONE Check if object is referenced. More...
bool ReferencedOnlyOnce (void) const THROWS_NONE Check if object is referenced only once. More...
void AddReference (void) const Add reference to object. More...
void RemoveReference (void) const Remove reference to object. More...
void ReleaseReference (void) const Remove reference without deleting object. More...
virtual void DoNotDeleteThisObject (void) Mark this object as not allocated in heap – do not delete this object. More...
virtual void DoDeleteThisObject (void) Mark this object as allocated in heap – object can be deleted. More...
void * operator new (size_t size) Define new operator for memory allocation. More...
void * operator new[] (size_t size) Define new[] operator for 'array' memory allocation. More...
void operator delete (void *ptr) Define delete operator for memory deallocation. More...
void operator delete[] (void *ptr) Define delete[] operator for memory deallocation. More...
void * operator new (size_t size, void *place) Define new operator. More...
void operator delete (void *ptr, void *place) Define delete operator. More...
void * operator new (size_t size, CObjectMemoryPool *place) Define new operator using memory pool. More...
void operator delete (void *ptr, CObjectMemoryPool *place) Define delete operator. More...
virtual void DebugDump (CDebugDumpContext ddc, unsigned int depth) const Define method for dumping debug information. More...
CDebugDumpable (void) virtual ~CDebugDumpable (void) void DebugDumpText (ostream &out, const string &bundle, unsigned int depth) const void DebugDumpFormat (CDebugDumpFormatter &ddf, const string &bundle, unsigned int depth) const void DumpToConsole (void) const
Query execution environment holds the function registry and the execution context.
Execution context is vaguely defined term, it can be anything query functions need: open files, databases, network connections, pools of threads, etc.
Query execution consists of distinct several phases:
1.Construction of execution environment
All function implementations are registered in CQueryExec
2.Query parsing (see CQueryParseTree). This step transforms query (string)
into query tree, the tree reflects operations precedence
3.Parsing tree validation and transformation (optional)
4.Query execution-evaluation. Execution engine traverses the query tree calling
appropriate functions to do expression(query tree node) evaluation.
Execution results for every tree node are stored in the tree as user
objects (classes derived from IQueryParseUserObject).
Definition at line 143 of file query_exec.hpp.
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