On Wed, 29 Mar 2017, Hick Gunter wrote:
Can you provide an example of the bytecode produced?
sqlite> .explain
sqlite> explain delete from device_cfgrecord where name == 'bar';
addr opcode p1 p2 p3 p4 p5 comment
---- ------------- ---- ---- ---- ------------- --
-------------
0 Init 0 15 0 00
1 Null 0 1 0 00
2 VOpen 0 0 0 vtab:CB1700 00
3 Integer 0 2 0 00
4 Integer 0 3 0 00
5 VFilter 0 11 2 00
6 VColumn 0 1 4 00
7 Ne 5 10 4 (BINARY) 52
8 Rowid 0 6 0 00
9 RowSetAdd 1 6 0 00
10 VNext 0 6 0 00
11 RowSetRead 1 14 6 00
12 VUpdate 0 1 6 vtab:CB1700 02
13 Goto 0 11 0 00
14 Halt 0 0 0 00
15 Transaction 0 1 724 0 01
16 VBegin 0 0 0 vtab:CB1700 00
17 String8 0 5 0 bar 00
18 Goto 0 1 0 00
sqlite> explain update device_cfgrecord set value = 'gumby' where name
== 'bar';
addr opcode p1 p2 p3 p4 p5 comment
---- ------------- ---- ---- ---- ------------- --
-------------
0 Init 0 27 0 00
1 OpenEphemeral 1 5 0 00
2 VOpen 0 0 0 vtab:CB1700 00
3 Integer 0 8 0 00
4 Integer 0 9 0 00
5 VFilter 0 17 8 00
6 VColumn 0 1 10 00
7 Ne 11 16 10 (BINARY) 52
8 Rowid 0 1 0 00
9 Rowid 0 2 0 00
10 VColumn 0 0 3 00
11 VColumn 0 1 4 00
12 String8 0 5 0 gumby 00
13 MakeRecord 1 5 6 00
14 NewRowid 1 7 0 00
15 Insert 1 6 7 00
16 VNext 0 6 0 00
17 Rewind 1 25 0 00
18 Column 1 0 1 00
19 Column 1 1 2 00
20 Column 1 2 3 00
21 Column 1 3 4 00
22 Column 1 4 5 00
23 VUpdate 0 5 1 vtab:CB1700 02
24 Next 1 18 0 00
25 Close 1 0 0 00
26 Halt 0 0 0 00
27 Transaction 0 1 724 0 01
28 VBegin 0 0 0 vtab:CB1700 00
29 String8 0 11 0 bar 00
30 Goto 0 1 0 00
Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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