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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-13 14:07:11 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-13 14:07:11 +0000
commit63847496f14c813a5d80efd5b7de0f1294ffe1e3 (patch)
tree01c7571c7c762ceee70638549a99834fdd7c411b /www/lang_conflict.html
parentInitial commit. (diff)
downloadsqlite3-63847496f14c813a5d80efd5b7de0f1294ffe1e3.tar.xz
sqlite3-63847496f14c813a5d80efd5b7de0f1294ffe1e3.zip
Adding upstream version 3.45.1.upstream/3.45.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+<title>The ON CONFLICT Clause</title>
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+<div class=fancy>
+<div class=nosearch>
+<div class="fancy_title">
+The ON CONFLICT Clause
+</div>
+</div>
+
+
+
+
+<p><b><a href="syntax/conflict-clause.html">conflict-clause:</a></b>
+<button id='x91fb97ac' onclick='hideorshow("x91fb97ac","xe68f90d9")'>hide</button></p>
+ <div id='xe68f90d9' class='imgcontainer'>
+ <div style="max-width:451px"><svg xmlns='http://www.w3.org/2000/svg' class="pikchr" viewBox="0 0 451.517 205.2">
+<circle cx="5" cy="6" r="3.6" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
+<polygon points="32,6 20,10 20,2" style="fill:rgb(0,0,0)"/>
+<path d="M9,6L26,6" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
+<polygon points="70,36 58,41 58,32" style="fill:rgb(0,0,0)"/>
+<path d="M32,6 L 39,6 Q 47,6 47,21 L 47,21 Q 47,36 56,36 L 64,36" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
+<path d="M85,51L94,51A15 15 0 0 0 109 36L109,36A15 15 0 0 0 94 21L85,21A15 15 0 0 0 70 36L70,36A15 15 0 0 0 85 51Z" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
+<text x="90" y="36" text-anchor="middle" fill="rgb(0,0,0)" dominant-baseline="central">ON</text>
+<polygon points="132,36 121,41 121,32" style="fill:rgb(0,0,0)"/>
+<path d="M109,36L126,36" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
+<path d="M147,51L222,51A15 15 0 0 0 237 36L237,36A15 15 0 0 0 222 21L147,21A15 15 0 0 0 132 36L132,36A15 15 0 0 0 147 51Z" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
+<text x="184" y="36" text-anchor="middle" fill="rgb(0,0,0)" dominant-baseline="central">CONFLICT</text>
+<polygon points="273,36 261,41 261,32" style="fill:rgb(0,0,0)"/>
+<path d="M237,36L267,36" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
+<path d="M288,51L365,51A15 15 0 0 0 381 36L381,36A15 15 0 0 0 365 21L288,21A15 15 0 0 0 273 36L273,36A15 15 0 0 0 288 51Z" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
+<text x="327" y="36" text-anchor="middle" fill="rgb(0,0,0)" dominant-baseline="central">ROLLBACK</text>
+<path d="M288,89L330,89A15 15 0 0 0 345 74L345,74A15 15 0 0 0 330 59L288,59A15 15 0 0 0 273 74L273,74A15 15 0 0 0 288 89Z" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
+<text x="309" y="74" text-anchor="middle" fill="rgb(0,0,0)" dominant-baseline="central">ABORT</text>
+<path d="M288,127L310,127A15 15 0 0 0 325 112A15 15 0 0 0 310 97L288,97A15 15 0 0 0 273 112A15 15 0 0 0 288 127Z" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
+<text x="299" y="112" text-anchor="middle" fill="rgb(0,0,0)" dominant-baseline="central">FAIL</text>
+<path d="M288,165L340,165A15 15 0 0 0 355 150A15 15 0 0 0 340 135L288,135A15 15 0 0 0 273 150A15 15 0 0 0 288 165Z" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
+<text x="314" y="150" text-anchor="middle" fill="rgb(0,0,0)" dominant-baseline="central">IGNORE</text>
+<path d="M288,203L352,203A15 15 0 0 0 367 187A15 15 0 0 0 352 172L288,172A15 15 0 0 0 273 187A15 15 0 0 0 288 203Z" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
+<text x="320" y="187" text-anchor="middle" fill="rgb(0,0,0)" dominant-baseline="central">REPLACE</text>
+<polygon points="404,36 392,41 392,32" style="fill:rgb(0,0,0)"/>
+<path d="M381,36L398,36" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
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+<path d="M404,150 L 411,150 Q 419,150 419,142 L 419,135" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
+</svg>
+</div>
+</div>
+
+
+<p>The ON CONFLICT clause is a
+non-standard extension specific to SQLite
+that can appear in many other SQL commands.
+It is given its own section in this document because it is not
+part of standard SQL and therefore might not be familiar.</p>
+
+<p>The ON CONFLICT clause described here has been a part of
+SQLite since before version 3.0.0 (2004-06-18). The phrase
+"ON&nbsp;CONFLICT" is also part of <a href="lang_upsert.html">UPSERT</a>, which is an extension
+to <a href="lang_insert.html">INSERT</a> added in version 3.24.0 (2018-06-04). Do not
+confuse these two separate uses of the "ON&nbsp;CONFLICT" phrase.
+
+</p><p>The syntax for the ON CONFLICT clause is as shown above for
+the CREATE TABLE command. For the INSERT and
+UPDATE commands, the keywords "ON CONFLICT" are replaced by "OR" so that
+the syntax reads more naturally. For example, instead of
+"INSERT ON CONFLICT IGNORE" we have "INSERT OR IGNORE".
+The keywords change but the meaning of the clause is the same
+either way.</p>
+
+<p>The ON CONFLICT clause applies to <a href="lang_createtable.html#uniqueconst">UNIQUE</a>, <a href="lang_createtable.html#notnullconst">NOT NULL</a>,
+<a href="lang_createtable.html#ckconst">CHECK</a>, and <a href="lang_createtable.html#primkeyconst">PRIMARY KEY</a> constraints.
+The ON CONFLICT algorithm does not
+apply to <a href="foreignkeys.html">FOREIGN KEY constraints</a>.
+There are five conflict resolution algorithm choices:
+ROLLBACK, ABORT, FAIL, IGNORE, and REPLACE.
+The default conflict resolution algorithm is ABORT. This
+is what they mean:</p>
+
+<dl>
+<dt><b>ROLLBACK</b></dt>
+<dd><p> When an applicable constraint violation occurs, the ROLLBACK
+resolution algorithm aborts the current SQL statement with
+an SQLITE_CONSTRAINT error and rolls back the current transaction.
+If no transaction is
+active (other than the implied transaction that is created on every
+command) then the ROLLBACK resolution algorithm works the same as the
+ABORT algorithm.</p></dd>
+
+<dt><b>ABORT</b></dt>
+<dd><p> When an applicable constraint violation occurs, the ABORT
+resolution algorithm aborts the current SQL statement
+with an SQLITE_CONSTRAINT error and backs out any changes
+made by the current SQL statement; but changes caused
+by prior SQL statements within the same transaction are preserved and the
+transaction remains active.
+This is the default behavior and the behavior specified by the SQL
+standard.</p></dd>
+
+<dt><b>FAIL</b></dt>
+<dd><p> When an applicable constraint violation occurs, the FAIL
+resolution algorithm aborts the current SQL statement with an
+SQLITE_CONSTRAINT error. But the FAIL resolution does not
+back out prior changes of the SQL statement that failed nor does
+it end the transaction.
+For example, if an UPDATE
+statement encountered a constraint violation on the 100th row that
+it attempts to update, then the first 99 row changes are preserved
+but changes to rows 100 and beyond never occur.</p>
+
+<p>The FAIL behavior only works for uniqueness, NOT NULL, and CHECK
+constraints. A <a href="foreignkeys.html">foreign key constraint</a> violation causes an ABORT.
+</p></dd>
+
+<dt><b>IGNORE</b></dt>
+<dd><p> When an applicable constraint violation occurs,
+the IGNORE resolution algorithm skips the one row that contains
+the constraint violation and continues processing subsequent rows
+of the SQL statement as if nothing went wrong.
+Other rows before and after the row that
+contained the constraint violation are inserted or updated
+normally. No error is returned for uniqueness, NOT NULL, and
+UNIQUE constraint errors when the IGNORE conflict resolution
+algorithm is used. However, the IGNORE conflict resolution
+algorithm works like ABORT for <a href="foreignkeys.html">foreign key constraint</a> errors.
+</p>
+</dd>
+
+<dt><b>REPLACE</b></dt>
+<dd><p> When a <a href="lang_createtable.html#uniqueconst">UNIQUE</a> or <a href="lang_createtable.html#primkeyconst">PRIMARY KEY</a> constraint violation occurs,
+the REPLACE algorithm
+deletes pre-existing rows that are causing the constraint violation
+prior to inserting or updating the current row and the command continues
+executing normally.
+If a <a href="lang_createtable.html#notnullconst">NOT NULL</a> constraint violation occurs, the REPLACE conflict
+resolution replaces the NULL value with
+the default value for that column, or if the column has no default
+value, then the ABORT algorithm is used.
+If a <a href="lang_createtable.html#ckconst">CHECK constraint</a> or <a href="foreignkeys.html">foreign key constraint</a> violation occurs,
+the REPLACE conflict resolution algorithm works like ABORT.</p>
+
+<p>When the REPLACE conflict resolution strategy deletes rows in order to
+satisfy a constraint, <a href="lang_createtrigger.html">delete triggers</a> fire if and only if
+<a href="pragma.html#pragma_recursive_triggers">recursive triggers</a> are enabled.</p>
+
+<p>The <a href="c3ref/update_hook.html">update hook</a> is not invoked for rows that
+are deleted by the REPLACE conflict resolution strategy. Nor does
+REPLACE increment the <a href="c3ref/changes.html">change counter</a>.
+The exceptional behaviors defined in this paragraph might change
+in a future release.</p>
+</dd></dl>
+
+<p>The algorithm specified in the OR clause of an INSERT or UPDATE
+overrides any algorithm specified in a CREATE TABLE.
+If no algorithm is specified anywhere, the ABORT algorithm is used.</p>
+<p align="center"><small><i>This page last modified on <a href="https://sqlite.org/docsrc/honeypot" id="mtimelink" data-href="https://sqlite.org/docsrc/finfo/pages/lang_conflict.in?m=99e70e2643">2022-04-18 02:55:50</a> UTC </small></i></p>
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-24 11:05:50 +0000