Library: Data
Package: DataCore
Header: Poco/Data/StatementImpl.h
Description
StatementImpl interface that subclasses must implement to define database dependent query execution.
StatementImpl's are noncopyable.
Inheritance
Direct Base Classes: Poco::RefCountedObject
All Base Classes: Poco::RefCountedObject
Known Derived Classes: Poco::Data::MySQL::MySQLStatementImpl, Poco::Data::ODBC::ODBCStatementImpl, Poco::Data::SQLite::SQLiteStatementImpl
Member Summary
Member Functions: add, addBinding, addExtract, bindImpl, binder, bindings, canBind, columnsExtracted, columnsReturned, compileImpl, execute, extractions, extractor, getState, hasNext, makeExtractors, metaColumn, next, reset, setExtractionLimit, toString
Inherited Functions: duplicate, referenceCount, release
Enumerations
State
Constructors
StatementImpl
Creates the StatementImpl.
Destructor
~StatementImpl 
virtual ~StatementImpl();
Destroys the StatementImpl.
Member Functions
add 
template < typename T > void add(
const T & t
);
Appends SQl statement (fragments).
addBinding
void addBinding(
AbstractBinding * info
);
Registers the Binding at the StatementImpl.
addExtract
void addExtract(
AbstractExtraction * info
);
Registers objects used for extracting data at the StatementImpl.
execute
Poco::UInt32 execute();
Executes a statement. Returns the number of rows extracted.
getState
State getState() const;
Returns the state of the Statement.
reset
void reset();
Resets the statement, so that we can reuse all bindings and re-execute again.
setExtractionLimit
void setExtractionLimit(
const Limit & extrLimit
);
Changes the extractionLimit to extrLimit. Per default no limit (EXTRACT_UNLIMITED) is set.
toString
std::string toString() const;
Create a string version of the SQL statement.
bindImpl 
virtual void bindImpl() = 0;
Binds parameters.
binder
virtual AbstractBinder & binder() = 0;
Returns the concrete binder used by the statement.
bindings
const AbstractBindingVec & bindings() const;
Returns the bindings.
bindings
AbstractBindingVec & bindings();
Returns the bindings.
canBind
virtual bool canBind() const = 0;
Returns if another bind is possible.
columnsExtracted
int columnsExtracted() const;
Returns the number of columns that the extractors handle.
columnsReturned
virtual Poco::UInt32 columnsReturned() const = 0;
Returns number of columns returned by query.
compileImpl
virtual void compileImpl() = 0;
Compiles the statement, doesn't bind yet.
extractions
const AbstractExtractionVec & extractions() const;
Returns the extractions vector.
extractions
AbstractExtractionVec & extractions();
Returns the extractions vector.
extractor
virtual AbstractExtractor & extractor() = 0;
Returns the concrete extractor used by the statement.
hasNext
virtual bool hasNext() = 0;
Returns true if a call to next() will return data.
Note that the implementation must support several consecutive calls to hasNext without data getting lost, ie. hasNext(); hasNext(); next() must be equal to hasNext(); next();
makeExtractors
void makeExtractors(
Poco::UInt32 count
);
Creates extraction vector. Used in case when there is data returned, but no extraction supplied externally.
metaColumn
virtual const MetaColumn & metaColumn(
Poco::UInt32 pos
) const = 0;
Returns column meta data.
metaColumn
const MetaColumn & metaColumn(
const std::string & name
) const;
Returns column meta data.
next
virtual void next() = 0;
Retrieves the next row from the resultset.
Will throw, if the resultset is empty. Expects the statement to be compiled and bound