COM_QUERY
With the COM_QUERY command, the client sends the server an SQL statement to be executed immediately.
Fields
- int<1> 0x03 : COM_QUERY header
- string<EOF> SQL statement
The SQL statement should be properly escaped. The escape character is usually a backslash '\' = 0x5c. However, if the status flag returned by the last OK Packet had NO_BACKSLASH_ESCAPES bit set then the escape character is a single quote(' = 0x60)
If the escape character is a backslash, the following characters are escaped:
- single quote (' = 0x60)
- back slash (\ = 0x5c)
- double quote (" = 0x22)
- null character (0x00)
If the escape character is a single quote, only the single quote (' = 0x60) can be escaped.
Response
The server can answer with 4 different responses that can be differentiated by the first byte (packet header):
- 0xFF - ERR_Packet if any error occurs.
- 0x00 - OK_Packet when query execution works without resultset.
- 0xFB - LOCAL_INFILE Packet if the query was "LOCAL INFILE ...".
- Or a Resultset, when the query returns results (in case of a SELECT query for example).
Example
| 1b 00 00 00 03 44 52 4f 50 20 54 41 42 4c 45 20 | .....DROP TABLE |
| 49 46 20 45 58 49 53 54 53 20 62 75 6c 6b 31 | IF EXISTS bulk1 |
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