Library: Data/ODBC
Package: ODBC
Header: Poco/Data/ODBC/Preparator.h
Description
Class used for database preparation where we first have to register all data types with respective memory output locations before extracting data. Extraction works in two-phases: first prepare is called once, then extract n-times. In ODBC, SQLBindCol/SQLFetch is the preferred method of data retrieval (SQLGetData is available, however with numerous driver implementation dependent limitations and inferior performance). In order to fit this functionality into Poco DataConnectors framework, every ODBC SQL statement instantiates its own Preparator object. This is done once per statement execution (from StatementImpl::bindImpl()).
Preparator object is used to :
1) Prepare SQL statement. 2) Provide and contain the memory locations where retrieved values are placed during recordset iteration. 3) Keep count of returned number of columns with their respective datatypes and sizes.
Notes:
- Value datatypes in this interface prepare() calls serve only for the purpose of type distinction. - Preparator keeps its own std::vector<Any> buffer for fetched data to be later retrieved by Extractor. - prepare() methods should not be called when extraction mode is DE_MANUAL
Inheritance
Direct Base Classes: Poco::Data::AbstractPreparator
All Base Classes: Poco::Data::AbstractPreparator
Member Summary
Member Functions: actualDataSize, at, bulkSize, columns, getDataExtraction, getMaxFieldSize, maxDataSize, operator [], prepare, setDataExtraction, setMaxFieldSize
Inherited Functions: getLength, isBulk, prepare, setBulk, setLength
Types
CharArray
typedef std::vector < char * > CharArray;
Ptr
typedef SharedPtr < Preparator > Ptr;
Enumerations
DataExtraction
DataType
Constructors
Preparator
Preparator(
const Preparator & other
);
Copy constructs the Preparator.
Preparator
Preparator(
const StatementHandle & rStmt,
const std::string & statement,
std::size_t maxFieldSize,
DataExtraction dataExtraction = DE_BOUND
);
Creates the Preparator.
Destructor
~Preparator 
~Preparator();
Destroys the Preparator.
Member Functions
actualDataSize
std::size_t actualDataSize(
std::size_t col,
std::size_t row = POCO_DATA_INVALID_ROW
) const;
Returns the returned length for the column and row specified. This is usually equal to the column size, except for variable length fields (BLOB and variable length strings). For null values, the return value is -1 (SQL_NO_DATA)
at 
Poco::Any & at(
std::size_t pos
);
Returns reference to column data.
bulkSize
std::size_t bulkSize(
std::size_t col = 0
) const;
Returns bulk size. Column argument is optional since all columns must be the same size.
columns
std::size_t columns() const;
Returns the number of columns. Resizes the internal storage if and only if the size is zero.
getDataExtraction
DataExtraction getDataExtraction() const;
Returns data extraction mode.
getMaxFieldSize
std::size_t getMaxFieldSize() const;
maxDataSize
std::size_t maxDataSize(
std::size_t pos
) const;
Returns max supported size for column at position pos. Returned length for variable length fields is the one supported by this implementation, not the underlying DB.
operator []
Poco::Any & operator[] (
std::size_t pos
);
Returns reference to column data.
prepare
void prepare(
std::size_t pos,
const Poco::Int8 & val
);
Prepares an Int8.
prepare
void prepare(
std::size_t pos,
const std::vector < Poco::Int8 > & val
);
Prepares an Int8 vector.
prepare
void prepare(
std::size_t pos,
const std::deque < Poco::Int8 > & val
);
Prepares an Int8 deque.
prepare
void prepare(
std::size_t pos,
const std::list < Poco::Int8 > & val
);
Prepares an Int8 list.
prepare
void prepare(
std::size_t pos,
const Poco::UInt8 & val
);
Prepares an UInt8.
prepare
void prepare(
std::size_t pos,
const std::vector < Poco::UInt8 > & val
);
Prepares an UInt8 vector.
prepare
void prepare(
std::size_t pos,
const std::deque < Poco::UInt8 > & val
);
Prepares an UInt8 deque.
prepare
void prepare(
std::size_t pos,
const std::list < Poco::UInt8 > & val
);
Prepares an UInt8 list.
prepare
void prepare(
std::size_t pos,
const Poco::Int16 & val
);
Prepares an Int16.
prepare
void prepare(
std::size_t pos,
const std::vector < Poco::Int16 > & val
);
Prepares an Int16 vector.
prepare
void prepare(
std::size_t pos,
const std::deque < Poco::Int16 > & val
);
Prepares an Int16 deque.
prepare
void prepare(
std::size_t pos,
const std::list < Poco::Int16 > & val
);
Prepares an Int16 list.
prepare
void prepare(
std::size_t pos,
const Poco::UInt16 & val
);
Prepares an UInt16.
prepare
void prepare(
std::size_t pos,
const std::vector < Poco::UInt16 > & val
);
Prepares an UInt16 vector.
prepare
void prepare(
std::size_t pos,
const std::deque < Poco::UInt16 > & val
);
Prepares an UInt16 deque.
prepare
void prepare(
std::size_t pos,
const std::list < Poco::UInt16 > & val
);
Prepares an UInt16 list.
prepare
void prepare(
std::size_t pos,
const Poco::Int32 & val
);
Prepares an Int32.
prepare
void prepare(
std::size_t pos,
const std::vector < Poco::Int32 > & val
);
Prepares an Int32 vector.
prepare
void prepare(
std::size_t pos,
const std::deque < Poco::Int32 > & val
);
Prepares an Int32 deque.
prepare
void prepare(
std::size_t pos,
const std::list < Poco::Int32 > & val
);
Prepares an Int32 list.
prepare
void prepare(
std::size_t pos,
const Poco::UInt32 & val
);
Prepares an UInt32.
prepare
void prepare(
std::size_t pos,
const std::vector < Poco::UInt32 > & val
);
Prepares an UInt32 vector.
prepare
void prepare(
std::size_t pos,
const std::deque < Poco::UInt32 > & val
);
Prepares an UInt32 deque.
prepare
void prepare(
std::size_t pos,
const std::list < Poco::UInt32 > & val
);
Prepares an UInt32 list.
prepare
void prepare(
std::size_t pos,
const Poco::Int64 & val
);
Prepares an Int64.
prepare
void prepare(
std::size_t pos,
const std::vector < Poco::Int64 > & val
);
Prepares an Int64 vector.
prepare
void prepare(
std::size_t pos,
const std::deque < Poco::Int64 > & val
);
Prepares an Int64 deque.
prepare
void prepare(
std::size_t pos,
const std::list < Poco::Int64 > & val
);
Prepares an Int64 list.
prepare
void prepare(
std::size_t pos,
const Poco::UInt64 & val
);
Prepares an UInt64.
prepare
void prepare(
std::size_t pos,
const std::vector < Poco::UInt64 > & val
);
Prepares an UInt64 vector.
prepare
void prepare(
std::size_t pos,
const std::deque < Poco::UInt64 > & val
);
Prepares an UInt64 deque.
prepare
void prepare(
std::size_t pos,
const std::list < Poco::UInt64 > & val
);
Prepares an UInt64 list.
prepare
void prepare(
std::size_t pos,
const bool & val
);
Prepares a boolean.
prepare
void prepare(
std::size_t pos,
const std::vector < bool > & val
);
Prepares a boolean vector.
prepare
void prepare(
std::size_t pos,
const std::deque < bool > & val
);
Prepares a boolean deque.
prepare
void prepare(
std::size_t pos,
const std::list < bool > & val
);
Prepares a boolean list.
prepare
void prepare(
std::size_t pos,
const float & val
);
Prepares a float.
prepare
void prepare(
std::size_t pos,
const std::vector < float > & val
);
Prepares a float vector.
prepare
void prepare(
std::size_t pos,
const std::deque < float > & val
);
Prepares a float deque.
prepare
void prepare(
std::size_t pos,
const std::list < float > & val
);
Prepares a float list.
prepare
void prepare(
std::size_t pos,
const double & val
);
Prepares a double.
prepare
void prepare(
std::size_t pos,
const std::vector < double > & val
);
Prepares a double vector.
prepare
void prepare(
std::size_t pos,
const std::deque < double > & val
);
Prepares a double deque.
prepare
void prepare(
std::size_t pos,
const std::list < double > & val
);
Prepares a double list.
prepare
void prepare(
std::size_t pos,
const char & val
);
Prepares a single character.
prepare
void prepare(
std::size_t pos,
const std::vector < char > & val
);
Prepares a single character vector.
prepare
void prepare(
std::size_t pos,
const std::deque < char > & val
);
Prepares a single character deque.
prepare
void prepare(
std::size_t pos,
const std::list < char > & val
);
Prepares a single character list.
prepare
void prepare(
std::size_t pos,
const std::string & val
);
Prepares a string.
prepare
void prepare(
std::size_t pos,
const std::vector < std::string > & val
);
Prepares a string vector.
prepare
void prepare(
std::size_t pos,
const std::deque < std::string > & val
);
Prepares a string deque.
prepare
void prepare(
std::size_t pos,
const std::list < std::string > & val
);
Prepares a string list.
prepare
void prepare(
std::size_t pos,
const UTF16String & val
);
Prepares a string.
prepare
void prepare(
std::size_t pos,
const std::vector < UTF16String > & val
);
Prepares a string vector.
prepare
void prepare(
std::size_t pos,
const std::deque < UTF16String > & val
);
Prepares a string deque.
prepare
void prepare(
std::size_t pos,
const std::list < UTF16String > & val
);
Prepares a string list.
prepare
void prepare(
std::size_t pos,
const Poco::Data::BLOB & val
);
Prepares a BLOB.
prepare
void prepare(
std::size_t pos,
const std::vector < Poco::Data::BLOB > & val
);
Prepares a BLOB vector.
prepare
void prepare(
std::size_t pos,
const std::deque < Poco::Data::BLOB > & val
);
Prepares a BLOB deque.
prepare
void prepare(
std::size_t pos,
const std::list < Poco::Data::BLOB > & val
);
Prepares a BLOB list.
prepare
void prepare(
std::size_t pos,
const Poco::Data::CLOB & val
);
Prepares a CLOB.
prepare
void prepare(
std::size_t pos,
const std::vector < Poco::Data::CLOB > & val
);
Prepares a CLOB vector.
prepare
void prepare(
std::size_t pos,
const std::deque < Poco::Data::CLOB > & val
);
Prepares a CLOB deque.
prepare
void prepare(
std::size_t pos,
const std::list < Poco::Data::CLOB > & val
);
Prepares a CLOB list.
prepare
void prepare(
std::size_t pos,
const Poco::Data::Date & val
);
Prepares a Date.
prepare
void prepare(
std::size_t pos,
const std::vector < Poco::Data::Date > & val
);
Prepares a Date vector.
prepare
void prepare(
std::size_t pos,
const std::deque < Poco::Data::Date > & val
);
Prepares a Date deque.
prepare
void prepare(
std::size_t pos,
const std::list < Poco::Data::Date > & val
);
Prepares a Date list.
prepare
void prepare(
std::size_t pos,
const Poco::Data::Time & val
);
Prepares a Time.
prepare
void prepare(
std::size_t pos,
const std::vector < Poco::Data::Time > & val
);
Prepares a Time vector.
prepare
void prepare(
std::size_t pos,
const std::deque < Poco::Data::Time > & val
);
Prepares a Time deque.
prepare
void prepare(
std::size_t pos,
const std::list < Poco::Data::Time > & val
);
Prepares a Time list.
prepare
void prepare(
std::size_t pos,
const Poco::DateTime & val
);
Prepares a DateTime.
prepare
void prepare(
std::size_t pos,
const std::vector < Poco::DateTime > & val
);
Prepares a DateTime vector.
prepare
void prepare(
std::size_t pos,
const std::deque < Poco::DateTime > & val
);
Prepares a DateTime deque.
prepare
void prepare(
std::size_t pos,
const std::list < Poco::DateTime > & val
);
Prepares a DateTime list.
prepare
void prepare(
std::size_t pos,
const Poco::UUID & val
);
Prepares a UUID.
prepare
void prepare(
std::size_t pos,
const Poco::Any & val
);
Prepares an Any.
prepare
void prepare(
std::size_t pos,
const std::vector < Poco::Any > & val
);
Prepares an Any vector.
prepare
void prepare(
std::size_t pos,
const std::deque < Poco::Any > & val
);
Prepares an Any deque.
prepare
void prepare(
std::size_t pos,
const std::list < Poco::Any > & val
);
Prepares an Any list.
prepare
void prepare(
std::size_t pos,
const Poco::Dynamic::Var & val
);
Prepares a Dynamic::Var.
prepare
void prepare(
std::size_t pos,
const std::vector < Poco::Dynamic::Var > & val
);
Prepares a Dynamic::Var vector.
prepare
void prepare(
std::size_t pos,
const std::deque < Poco::Dynamic::Var > & val
);
Prepares a Dynamic::Var deque.
prepare
void prepare(
std::size_t pos,
const std::list < Poco::Dynamic::Var > & val
);
Prepares a Dynamic::Var list.
setDataExtraction
void setDataExtraction(
DataExtraction ext
);
Set data extraction mode.
setMaxFieldSize
void setMaxFieldSize(
std::size_t size
);
Sets maximum supported field size.