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Overview
| Comment: | Improved documentation for PRAGMA foreign_key_check and foreign_key_list. |
|---|---|
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
72af2c4df12c9ac1997439a761dd72b7 |
| User & Date: | drh 2013-03-19 20:00:00 |
Context
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2013-03-22
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| 23:39 | Fix a typo. check-in: 349d556c0a user: drh tags: trunk | |
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2013-03-19
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| 20:00 | Improved documentation for PRAGMA foreign_key_check and foreign_key_list. check-in: 72af2c4df1 user: drh tags: trunk | |
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2013-03-18
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| 21:54 | Add a mention of the ZIPVFS extension to the Support page. check-in: c6ec519b53 user: drh tags: trunk | |
Changes
Changes to pages/pragma.in.
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^(The third column is the name of the database file itself, or an empty
string if the database is not associated with a file.)^</p>
}
Pragma foreign_key_list {
<p>^(<b>PRAGMA foreign_key_list(</b><i>table-name</i><b>);</b></p>
<p>This pragma returns one row for each foreign key that references
a column in the argument table.)^
}
Pragma foreign_key_check {
<p><b>^(PRAGMA foreign_key_check;)^</b></p>
<p>The foreign_key_check pragma checks the database for
[foreign key constraints] that are violated and returns one row of
output for each violation. There are four columns in each result row.
The first column is the name of the table that contains the REFERENCES
clause. The second column is the [rowid] of the row that
contains the invalid REFERENCES clause. The third column is the name
of the table that is referred to. The fourth column is the index of
the specific foreign key constraint that failed. The fourth column
in the output of the foreign_key_check pragma is the same integer as
the first column in the output of the [foreign_key_list pragma].</p>
}
Pragma freelist_count {
<p>^(<b>PRAGMA freelist_count;</b></p>
<p>Return the number of unused pages in the database file.)^</p>
}
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^(The third column is the name of the database file itself, or an empty
string if the database is not associated with a file.)^</p>
}
Pragma foreign_key_list {
<p>^(<b>PRAGMA foreign_key_list(</b><i>table-name</i><b>);</b></p>
<p>This pragma returns one row for each [foreign key constraint]
created by a REFERENCES clause in the CREATE TABLE statement of
table "<i>table-name</i>".)^
}
Pragma foreign_key_check {
<p>^(<b>PRAGMA foreign_key_check;
<br>PRAGMA foreign_key_check(</b><i>table-name</i><b>);</b>)^</b></p>
<p>The foreign_key_check pragma checks the database, or the table
called "<i>table-name</i>", for
[foreign key constraints] that are violated and returns one row of
output for each violation. There are four columns in each result row.
The first column is the name of the table that contains the REFERENCES
clause. The second column is the [rowid] of the row that
contains the invalid REFERENCES clause. The third column is the name
of the table that is referred to. The fourth column is the index of
the specific foreign key constraint that failed. The fourth column
in the output of the foreign_key_check pragma is the same integer as
the first column in the output of the [foreign_key_list pragma].
When a "<i>table-name</i>" is specified, the only foreign key constraints
checked are those created by REFERENCES clauses in the
CREATE TABLE statement for <i>table-name</i>.</p>
}
Pragma freelist_count {
<p>^(<b>PRAGMA freelist_count;</b></p>
<p>Return the number of unused pages in the database file.)^</p>
}
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