191 lines
8.2 KiB
HTML
191 lines
8.2 KiB
HTML
<!DOCTYPE html>
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<html><head>
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<link href="../sqlite.css" rel="stylesheet">
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<title>SQLite Release 3.40.1 On 2022-12-28</title>
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<!-- path=../ -->
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</head>
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<body>
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<div class=nosearch>
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<a href="../index.html">
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<img class="logo" src="../images/sqlite370_banner.gif" alt="SQLite" border="0">
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</a>
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<div><!-- IE hack to prevent disappearing logo --></div>
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<div class="tagline desktoponly">
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Small. Fast. Reliable.<br>Choose any three.
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</div>
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<div class="menu mainmenu">
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<ul>
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<li><a href="../index.html">Home</a>
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</ul>
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<ul>
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<li><a href='../about.html'>About</a>
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<li><a href='../docs.html'>Documentation</a>
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<li><a href='../download.html'>Download</a>
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<li><a href='../support.html'>Support</a>
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<li><a href='../prosupport.html'>Purchase</a>
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<form method="GET" action="../search">
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<select name="s" id="searchtype">
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<option value="d">Search Documentation</option>
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<option value="c">Search Changelog</option>
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<h2>SQLite Release 3.40.1 On 2022-12-28</h2><p><b>Prior changes from version 3.40.0 (2022-11-16):</b></p>
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<p><ol class='lessindent'>
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<li value='1'> Add support for compiling <a href="https://sqlite.org/wasm">SQLite to WASM</a>
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and running it in web browsers. NB: The WASM build and its interfaces
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are considered "beta" and are subject to minor changes if the need
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arises. We anticipate finalizing the interface for the next release.
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<li> Add the <a href="../recovery.html">recovery extension</a> that might be able to recover some content
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from a corrupt database file.
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<li> Query planner enhancements:
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<ol type="a">
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<li> Recognize <a href="../queryplanner.html#covidx">covering indexes</a> on tables with more than 63 columns where
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columns beyond the 63rd column are used in the query and/or are
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referenced by the index.
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<li> Extract the values of expressions contained within <a href="../expridx.html">expression indexes</a>
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where practical, rather than recomputing the expression.
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<li> The NOT NULL and IS NULL operators (and their equivalents) avoid
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loading the content of large strings and BLOB values from disk.
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<li> Avoid materializing a view on which a full scan is performed
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exactly once. Use and discard the rows of the view as they are computed.
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<li> Allow flattening of a subquery that is the right-hand operand of
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a LEFT JOIN in an aggregate query.
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</ol>
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<li> A new typedef named <a href="../c3ref/filename.html">sqlite3_filename</a> is added and used to represent
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the name of a database file. Various interfaces are
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modified to use the new typedef instead of "char*". This interface
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change should be fully backwards compatible, though it might cause
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(harmless) compiler warnings when rebuilding some legacy applications.
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<li> Add the <a href="../c3ref/value_encoding.html">sqlite3_value_encoding()</a> interface.
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<li> Security enhancement: <a href="../c3ref/c_dbconfig_defensive.html#sqlitedbconfigdefensive">SQLITE_DBCONFIG_DEFENSIVE</a> is augmented to prohibit
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changing the <a href="../pragma.html#pragma_schema_version">schema_version</a>. The schema_version
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becomes read-only in defensive mode.
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<li> Enhancements to the <a href="../pragma.html#pragma_integrity_check">PRAGMA integrity_check</a> statement:
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<ol type="a">
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<li> Columns in non-STRICT tables with TEXT affinity should not contain numeric values.
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<li> Columns in non-STRICT tables with NUMERIC affinity should not
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contain TEXT values that could be converted into numbers.
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<li> Verify that the rows of a <a href="../withoutrowid.html">WITHOUT ROWID</a> table are in the correct order.
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</ol>
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<li> Enhance the <a href="../lang_vacuum.html#vacuuminto">VACUUM INTO</a> statement so that it honors the
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<a href="../pragma.html#pragma_synchronous">PRAGMA synchronous</a> setting.
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<li> Enhance the <a href="../c3ref/strglob.html">sqlite3_strglob()</a> and <a href="../c3ref/strlike.html">sqlite3_strlike()</a> APIs so that they are able
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to accept NULL pointers for their string parameters and still generate a sensible
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result.
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<li> Provide the new <a href="../compile.html#max_allocation_size">SQLITE_MAX_ALLOCATION_SIZE</a> compile-time option for limiting
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the size of memory allocations.
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<li> Change the algorithm used by SQLite's built-in pseudo-random number generator (PRNG)
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from RC4 to Chacha20.
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<li> Allow two or more indexes to have the same name as long as they are all in
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separate schemas.
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<li> Miscellaneous performance optimizations result in about 1% fewer CPU cycles
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used on typical workloads.
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</ol>
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<p><b>Changes in this specific patch release, version 3.40.1 (2022-12-28):</b></p>
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<p><ol class='lessindent'>
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<li value='14'> Fix the <a href="../cli.html#safemode">--safe command-line option</a> to the <a href="../cli.html">CLI</a>
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such that it correctly disallows the
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use of SQL functions like writefile() that can cause harmful side-effects.
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<li> Fix a potential infinite loop in the <a href="../malloc.html#memsys5">memsys5</a> alternative memory allocator. This
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bug was introduced by a performance optimization in version 3.39.0.
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<li> Various other obscure fixes.
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<p><b>Hashes:</b>
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<li>SQLITE_SOURCE_ID: 2022-12-28 14:03:47 df5c253c0b3dd24916e4ec7cf77d3db5294cc9fd45ae7b9c5e82ad8197f38a24
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<li>SHA3-256 for sqlite3.c: 4d6800e9032ff349376fe612e422b49ba5eb4e378fac0b3e405235d09dd366ab
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</ol></p>
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<p>A <a href="../changes.html">complete list of SQLite releases</a>
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in a single page and a <a href="../chronology.html">chronology</a> are both also available.
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A detailed history of every
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check-in is available at
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<a href="https://www.sqlite.org/src/timeline">
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SQLite version control site</a>.</p>
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