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// Copyright (C) 2011 Davis E. King (davis@dlib.net)
// License: Boost Software License See LICENSE.txt for the full license.
#undef DLIB_SQLiTE_TOOLS_ABSTRACT_H_
#ifdef DLIB_SQLiTE_TOOLS_ABSTRACT_H_
#include "sqlite_abstract.h"
// ----------------------------------------------------------------------------------------
namespace dlib
{
class transaction : noncopyable
{
/*!
WHAT THIS OBJECT REPRESENTS
This object is a tool for creating exception safe
database transactions.
!*/
public:
transaction (
database& db
);
/*!
ensures
- Begins a database transaction which will be rolled back
if commit() isn't called eventually.
- In particular, performs: db.exec("begin transaction");
!*/
void commit (
);
/*!
ensures
- if (commit() hasn't already been called) then
- Commits all changes made during this database transaction.
- In particular, performs: db.exec("commit");
- else
- does nothing
!*/
~transaction(
);
/*!
ensures
- if (commit() was never called) then
- rolls back any changes made to the database during this transaction.
- In particular, performs: db.exec("rollback");
- else
- does nothing
!*/
};
// ----------------------------------------------------------------------------------------
template <
typename T
>
void query_object (
database& db,
const std::string& query,
T& item
);
/*!
ensures
- executes the given SQL query against db. If the query results in a
single row and column being returned then the data in the column is
interpreted as a binary BLOB and deserialized into item.
throws
- sqlite_error or serialization_error if an error occurs which prevents
this operation from succeeding.
!*/
// ----------------------------------------------------------------------------------------
std::string query_text (
database& db,
const std::string& query
);
/*!
ensures
- executes the given SQL query against db. If the query results in a
single row and column being returned then the data in the column is
converted to text and returned.
throws
- sqlite_error if an error occurs which prevents this operation from
succeeding.
!*/
// ----------------------------------------------------------------------------------------
double query_double (
database& db,
const std::string& query
);
/*!
ensures
- executes the given SQL query against db. If the query results in a
single row and column being returned then the data in the column is
converted to a double and returned.
throws
- sqlite_error if an error occurs which prevents this operation from
succeeding.
!*/
// ----------------------------------------------------------------------------------------
int query_int (
database& db,
const std::string& query
);
/*!
ensures
- executes the given SQL query against db. If the query results in a
single row and column being returned then the data in the column is
converted to an int and returned.
throws
- sqlite_error if an error occurs which prevents this operation from
succeeding.
!*/
// ----------------------------------------------------------------------------------------
int64 query_int64 (
database& db,
const std::string& query
);
/*!
ensures
- executes the given SQL query against db. If the query results in a
single row and column being returned then the data in the column is
converted to an int64 and returned.
throws
- sqlite_error if an error occurs which prevents this operation from
succeeding.
!*/
// ----------------------------------------------------------------------------------------
const std::vector<char> query_blob (
database& db,
const std::string& query
);
/*!
ensures
- executes the given SQL query against db. If the query results in a
single row and column being returned then the data in the column is
returned as a binary BLOB.
throws
- sqlite_error if an error occurs which prevents this operation from
succeeding.
!*/
// ----------------------------------------------------------------------------------------
}
#endif // DLIB_SQLiTE_TOOLS_H_
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