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<a href="intro.html"><h2>SQLite C Interface</h2></a><h2>Name Of The Folder Holding Database Files</h2><blockquote><pre>SQLITE_EXTERN char *sqlite3_data_directory;
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</pre></blockquote><p>
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If this global variable is made to point to a string which is
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the name of a folder (a.k.a. directory), then all database files
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specified with a relative pathname and created or accessed by
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SQLite when using a built-in windows <a href="../c3ref/vfs.html">VFS</a> will be assumed
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to be relative to that directory. If this variable is a NULL
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pointer, then SQLite assumes that all database files specified
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with a relative pathname are relative to the current directory
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for the process. Only the windows VFS makes use of this global
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variable; it is ignored by the unix VFS.</p>
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<p>Changing the value of this variable while a database connection is
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open can result in a corrupt database.</p>
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<p>It is not safe to read or modify this variable in more than one
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thread at a time. It is not safe to read or modify this variable
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if a <a href="../c3ref/sqlite3.html">database connection</a> is being used at the same time in a separate
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It is intended that this variable be set once
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as part of process initialization and before any SQLite interface
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routines have been called and that this variable remain unchanged
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<p>The <a href="../pragma.html#pragma_data_store_directory">data_store_directory pragma</a> may modify this variable and cause
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it to point to memory obtained from <a href="../c3ref/free.html">sqlite3_malloc</a>. Furthermore,
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the <a href="../pragma.html#pragma_data_store_directory">data_store_directory pragma</a> always assumes that any string
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that this variable points to is held in memory obtained from
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<a href="../c3ref/free.html">sqlite3_malloc</a> and the pragma may attempt to free that memory
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using <a href="../c3ref/free.html">sqlite3_free</a>.
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Hence, if this variable is modified directly, either it should be
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made NULL or made to point to memory obtained from <a href="../c3ref/free.html">sqlite3_malloc</a>
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or else the use of the <a href="../pragma.html#pragma_data_store_directory">data_store_directory pragma</a> should be avoided.
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</p><p>See also lists of
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<a href="objlist.html">Objects</a>,
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<a href="constlist.html">Constants</a>, and
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<a href="funclist.html">Functions</a>.</p>
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