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TableMapper::AbstractSqlStatementOutboundMapper Class Referenceabstract

provides an abstract base for all SQL based outbound mappers More...

Inheritance diagram for TableMapper::AbstractSqlStatementOutboundMapper:
[legend]

## Public Member Functions

| commit ()
| commits the transaction and frees the Qore::SQL::AbstractDatasource transaction thread resource
| constructor (hash mapv, *hash opts)
| builds the object based on an optional hash providing field mappings, data constraints, and optionally custom mapping logic More...
*hash | getData ()
| Retrieve mapped data as a hash of lists. More...
*list | getDataRows ()
| Retrieve mapped data as a list of hashes. More...
abstract Qore::SQL::AbstractDatasource | getDatasource ()
| returns the AbstractDatasource object associated with this object
Qore::SQL::SQLStatement | getRowIterator ()
| returns a row iterator for the underlying SQL statement for this object More...
SqlStatementMapperIterator | iterator ()
| Returns an SqlStatementMapperIterator based on the current object. More...
hash< auto > | optionKeys ()
| returns a list of valid constructor options for this class (can be overridden in subclasses) More...
| rollback ()
| rolls the transaction back and frees the Qore::SQL::AbstractDatasource transaction thread resource

## Public Attributes

const | OptionDefaults
| default option values
const | OptionKeys
| option keys for this object

## Private Member Functions

abstract | initOptions (reference< hash > opts)
| re-implement to initialize options
abstract | initStatement ()
| re-implement to initialize Qore::SQL::SQLStatement on demand

## Detailed Description

provides an abstract base for all SQL based outbound mappers

## Member Function Documentation

TableMapper::AbstractSqlStatementOutboundMapper::constructor | ( | hash | mapv,
|  | *hash | opts
| ) |  |

builds the object based on an optional hash providing field mappings, data constraints, and optionally custom mapping logic

The source statement is also scanned using Qore::SQL::SQLStatement and column definitions are used to update the source record specification.

Parameters

  mapv | a optional hash providing overrides for the default 1:1 input to output field mappings; each hash key is the name in lower case of the output column in the target table; each value is either True (meaning no translations are done; the data is copied 1:1) or a hash describing the mapping; see Mapper Specification Format for detailed documentation for this option

  opts

  a hash of options for the mapper; see Mapper Options for a description of valid mapper options plus the following options specific to this object:
  - `"select_block"`: for size of the batch returned from TableMapper::SqlStatementOutboundMapper::getData() or SqlStatementOutboundMapper::getDataRows()
  - `"sh"`: an SqlUtil select hash
  - `"table"`: (required) the AbstractTable object for the source of the data

Exceptions

  MAP-ERROR | invalid select_block size; must be >= 1 if present

*hash TableMapper::AbstractSqlStatementOutboundMapper::getData | ( |  | ) |

Retrieve mapped data as a hash of lists.

Returns
  *hash with data or Qore::NOTHING in case there are no more data available.

The size of the batch is driven by the `select_block` option passed in the constructor.

The hash is in Qore::SQL::AbstractDatasource::select() form - meaning it is a hash with column names as keys. Values are lists of column values. This data structure is used for Qore::context statement or BulksSqlUtil operations.

*list TableMapper::AbstractSqlStatementOutboundMapper::getDataRows | ( |  | ) |

Retrieve mapped data as a list of hashes.

Returns
  *list with data or Qore::NOTHING in case there are no more data available.

Size of the batch is driven by the `select_block` option passed in the constructor.

List is in Qore::SQL::AbstractDatasource::selectRows() form - meaning it is a list with hashes, where every hash has column names as keys with single values as hash values.

Qore::SQL::SQLStatement TableMapper::AbstractSqlStatementOutboundMapper::getRowIterator | ( |  | ) |

returns a row iterator for the underlying SQL statement for this object

Since
  TableMapper 1.1.1

SqlStatementMapperIterator TableMapper::AbstractSqlStatementOutboundMapper::iterator | ( |  | ) |

Returns an SqlStatementMapperIterator based on the current object.

Returns
  an SqlStatementMapperIterator based on the current object

Data are retrieved with standard Qore::AbstractIterator::getValue() or similar. Value is a hash with column names as keys.

hash<auto> TableMapper::AbstractSqlStatementOutboundMapper::optionKeys | ( |  | ) |

returns a list of valid constructor options for this class (can be overridden in subclasses)

Returns
  a list of valid constructor options for this class (can be overridden in subclasses)