1. Executable programs or shell commands

sqldiff

Section: User Commands (1)
Updated: 2018-05-10
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NAME

sqldiff - sqlite3 database difference utility

SYNOPSIS

sqldiff [options] database1.sqlite database2.sqlite

DESCRIPTION

The sqldiff binary is a command-line utility program that displays the differences between SQLite databases. The usual output is an SQL script that will transform database1.sqlite (the "source" database) into database2.sqlite (the "destination" database).

The sqldiff utility works by finding rows in the source and destination that are logical "pairs". The default behavior is to treat two rows as pairs if they are in tables with the same name and they have the same rowid, or in the case of a WITHOUT ROWID table if they have the same PRIMARY KEY. Any differences in the content of paired rows are output as UPDATEs. Rows in the source database that could not be paired are output as DELETEs. Rows in the destination database that could not be paired are output as INSERTs.

The --primarykey flag changes the pairing algorithm slightly so that the schema-declared PRIMARY KEY is always used for pairing, even on tables that have a rowid. This is often a better choice for finding differences, however it can lead to missed differences in the case of rows that have one or more PRIMARY KEY columns set to NULL.

OPTIONS

--changset FILE: Do not write changes to standard output. Instead, write a (binary) changeset file into FILE. The changeset can be interpreted using the sessions extension to SQLite.
--lib LIBRARY, -L LIBRARY: Load the shared library or DLL file LIBRARY into SQLite prior to computing the differences. This can be used to add application-defined collating sequences that are required by the schema.
--primarykey: Use the schema-defined PRIMARY KEY instead of the rowid to pair rows in the source and destination database. (See additional explanation below.)
--schema: Show only differences in the schema not the table content
--summary: Show how many rows have changed on each table, but do not show the actual changes
--table TABLE: Show only the differences in content for TABLE, not for the entire database
--transaction: Wrap SQL output in a single large transaction
--vtab: Add support for handling FTS3, FTS5 and rtree virtual tables. See below for details.

LIMITATIONS

The sqldiff utility is unable to compute differences for rowid tables for which the rowid is inaccessible. An example of a table with an inaccessible rowid is:

CREATE TABLE inaccessible_rowid(
   "rowid" TEXT,
   "oid" TEXT,
   "_rowid_" TEXT
);

The sqldiff utility does not (currently) display differences in TRIGGERs or VIEWs.

By default, differences in the schema or content of virtual tables are not reported on.

However, if a virtual table implementation creates real tables (sometimes referred to as "shadow" tables) within the database to store its data in, then sqldiff.exe does calculate the difference between these. This can have surprising effects if the resulting SQL script is then run on a database that is not exactly the same as the source database. For several of SQLite's bundled virtual tables (FTS3, FTS5, rtree and others), the surprising effects may include corruption of the virtual table content.

If the --vtab option is passed to sqldiff, then it ignores all underlying shadow tables belonging to an FTS3, FTS5 or rtree virtual table and instead includes the virtual table differences directly.

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