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57 lines
3.1 KiB
Markdown
57 lines
3.1 KiB
Markdown
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<h1 align="center">The dbtotxt Tool</h1>
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The dbtotxt utility program reads an SQLite database file and writes its
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raw binary content to screen as a hex dump for testing and debugging
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purposes.
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The hex-dump output is formatted in such a way as to be easily readable
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both by humans and by software. The dbtotxt utility has long been a part
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of the TH3 test suite. The output of dbtotxt can be embedded in TH3 test
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scripts and used to generate very specific database files, perhaps with
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deliberately introduced corruption. The cov1/corrupt*.test modules in
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TH3 make extensive use of dbtotxt.
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More recently (2018-12-13) the dbtotxt utility has been added to the SQLite
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core and the command-line shell (CLI) has been augmented to be able to read
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dbtotxt output. The CLI dot-command is:
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> .open --hexdb ?OPTIONAL-FILENAME?
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If the OPTIONAL-FILENAME is included, then content is read from that file.
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If OPTIONAL-FILENAME is omitted, then the text is taken from the input stream,
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terminated by the "| end" line of the dbtotxt text. This allows small test
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databases to be embedded directly in scripts. Consider this example:
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>
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.open --hexdb
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| size 8192 pagesize 4096 filename x9.db
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| page 1 offset 0
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| 0: 53 51 4c 69 74 65 20 66 6f 72 6d 61 74 20 33 00 SQLite format 3.
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| 16: 10 00 01 01 00 40 20 20 00 00 00 04 00 00 00 02 .....@ ........
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| 32: 00 00 00 00 00 00 00 00 00 00 00 01 00 00 00 04 ................
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| 48: 00 00 00 00 00 00 00 00 00 00 00 01 00 00 00 00 ................
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| 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 04 ................
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| 96: 00 2e 30 38 0d 00 00 00 01 0f c0 00 0f c0 00 00 ..08............
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| 4032: 3e 01 06 17 11 11 01 69 74 61 62 6c 65 74 31 74 >......itablet1t
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| 4048: 31 02 43 52 45 41 54 45 20 54 41 42 4c 45 20 74 1.CREATE TABLE t
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| 4064: 31 28 78 2c 79 20 44 45 46 41 55 4c 54 20 78 27 1(x,y DEFAULT x'
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| 4080: 66 66 27 2c 7a 20 44 45 46 41 55 4c 54 20 30 29 ff',z DEFAULT 0)
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| page 2 offset 4096
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| 0: 0d 08 14 00 04 00 10 00 0e 05 0a 0f 04 15 00 10 ................
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| 16: 88 02 03 05 90 04 0e 08 00 00 00 00 00 00 00 00 ................
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| 1040: 00 00 00 00 ff 87 7c 02 05 8f 78 0e 08 00 00 00 ......|...x.....
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| 2064: 00 00 00 ff 0c 0a 01 fb 00 00 00 00 00 00 00 00 ................
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| 2560: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 83 ................
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| 2576: 78 01 05 87 70 0e 08 00 00 00 00 00 00 00 00 00 x...p...........
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| 3072: 00 00 00 00 00 00 00 00 00 ff 00 00 01 fb 00 00 ................
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| 3584: 00 00 00 00 00 83 78 00 05 87 70 0e 08 00 00 00 ......x...p.....
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| 4080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ff ................
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| end x9.db
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SELECT rowid FROM t1;
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PRAGMA integrity_check;
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You can run this script to see that the database file is correctly decoded
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and loaded. Furthermore, you can make subtle corruptions to the input
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database simply by editing the hexadecimal description, then rerun the
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script to verify that SQLite correctly handles the corruption.
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