USER_VAR_EVENT
A USER_VAR_EVENT is written every time a statement uses a user defined variable.
Header
- Event Type is 14 (0x0e)
Fields
- uint<4> The length of user variable name
- string<len> The name of the user variable
- uint<1> NULL indicator
- if (not null indicator)
- uint<1> variable type
- uint<4> collation number
- uint<4> The length of value
- string<len> value
- uint<1> flags
Variable type
| Value | Type | Example |
| 0x00 | STRING_RESULT | set @a:="foo" |
| 0x01 | REAL_RESULT | set @a:= @@timestamp |
| 0x02 | INT_RESULT | set @a:= 4 |
| 0x03 | ROW_RESULT | (not in use) |
| 0x04 | DECIMAL_RESULT | set @a:=1.2345 |
Flag
| 0x01 | unsigned |
Example for SET @foo:="bar"from mysqlbinlog Utility, CRC32
# at 511 #180610 10:26:43 server id 1 end_log_pos 554 CRC32 0x7dd93d6b User_var SET @`foo`:=_utf8 X'626172' COLLATE `utf8_general_ci`/*!*/;
Example Event As It's Written In The Binlog File
c3 e0 1c 5b 0e 01 00 00 00 2b 00 ...[.....+.
00 00 2a 02 00 00 00 00 03 00 00 00 66 6f 6f 00 ..*.........foo.
00 21 00 00 00 03 00 00 00 62 61 72 6b 3d d9 7d .!.......bark=.} ....
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