- Main Page
- Classes
- Files

- Class List
- Class Hierarchy
- Class Members

# mysqlpp::SQLBuffer Class Reference

Holds SQL data in string form plus type information for use in converting the string to compatible C++ data types. More...

`#include <sql_buffer.h>`

Collaboration diagram for mysqlpp::SQLBuffer:

[legend]
List of all members.

## Public Types
typedef unsigned int | size_type
| Type of length values.
## Public Member Functions
| SQLBuffer (const char *data, size_type length, mysql_type_info type, bool is_null)
| Initialize object as a copy of a raw data buffer.
| SQLBuffer (const std::string &s, mysql_type_info type, bool is_null)
| Initialize object as a copy of a C++ string object.
| ~SQLBuffer ()
| Destructor.
SQLBuffer & | assign (const char *data, size_type length, mysql_type_info type=mysql_type_info::string_type, bool is_null=false)
| Replace contents of buffer with copy of given C string.
SQLBuffer & | assign (const std::string &s, mysql_type_info type=mysql_type_info::string_type, bool is_null=false)
| Replace contents of buffer with copy of given C++ string.
const char * | data () const
| Return pointer to raw data buffer.
bool | escape_q () const
| Returns true if we were initialized with a data type that must be escaped when used in a SQL query.
size_type | length () const
| Return number of bytes in data buffer.
bool | is_string ()
| Returns true if type of buffer's contents is string.
bool | is_null () const
| Return true if buffer's contents represent a SQL null.
bool | quote_q () const
| Returns true if we were initialized with a data type that must be quoted when used in a SQL query.
void | set_null ()
| Sets the internal SQL null flag.
const mysql_type_info & | type () const
| Return the SQL type of the data held in the buffer.

## Detailed Description

Holds SQL data in string form plus type information for use in converting the string to compatible C++ data types.

## Constructor & Destructor Documentation

mysqlpp::SQLBuffer::SQLBuffer | ( | const char * | data,
|  | size_type | length,
|  | mysql_type_info | type,
|  | bool | is_null |
| ) |  |  | `[inline]`

Initialize object as a copy of a raw data buffer.

Copies the string into a new buffer one byte longer than the length value given, using that to hold a C string null terminator, just for safety. The length value we keep does not include this extra byte, allowing this same mechanism to work for both C strings and binary data.

## Member Function Documentation

bool mysqlpp::SQLBuffer::is_null | ( |  | ) | const`[inline]`

Return true if buffer's contents represent a SQL null.

The buffer's actual content will probably be "NULL" or something like it, but in the SQL data type system, a SQL null is distinct from a plain string with value "NULL".

size_type mysqlpp::SQLBuffer::length | ( |  | ) | const`[inline]`

Return number of bytes in data buffer.

Count does not include the trailing null we tack on to our copy of the buffer for ease of use in C string contexts. We do this because we can be holding binary data just as easily as a C string.

The documentation for this class was generated from the following files:

- sql_buffer.h
- sql_buffer.cpp