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+<!-- keywords: {protected sqlite3_value} sqlite3_value {unprotected sqlite3_value} -->
+<div class=nosearch>
+<a href="intro.html"><h2>SQLite C Interface</h2></a>
+<h2>Dynamically Typed Value Object</h2>
+</div>
+<blockquote><pre>
+typedef struct sqlite3_value sqlite3_value;
+</pre></blockquote>
+<p>
+SQLite uses the sqlite3_value object to represent all values
+that can be stored in a database table. SQLite uses dynamic typing
+for the values it stores.  Values stored in sqlite3_value objects
+can be integers, floating point values, strings, BLOBs, or NULL.</p>
+
+<p>An sqlite3_value object may be either "protected" or "unprotected".
+Some interfaces require a protected sqlite3_value.  Other interfaces
+will accept either a protected or an unprotected sqlite3_value.
+Every interface that accepts sqlite3_value arguments specifies
+whether or not it requires a protected sqlite3_value.  The
+<a href="../c3ref/value_dup.html">sqlite3_value_dup()</a> interface can be used to construct a new
+protected sqlite3_value from an unprotected sqlite3_value.</p>
+
+<p>The terms "protected" and "unprotected" refer to whether or not
+a mutex is held.  An internal mutex is held for a protected
+sqlite3_value object but no mutex is held for an unprotected
+sqlite3_value object.  If SQLite is compiled to be single-threaded
+(with <a href="../compile.html#threadsafe">SQLITE_THREADSAFE=0</a> and with <a href="../c3ref/threadsafe.html">sqlite3_threadsafe()</a> returning 0)
+or if SQLite is run in one of reduced mutex modes
+<a href="../c3ref/c_config_covering_index_scan.html#sqliteconfigsinglethread">SQLITE_CONFIG_SINGLETHREAD</a> or <a href="../c3ref/c_config_covering_index_scan.html#sqliteconfigmultithread">SQLITE_CONFIG_MULTITHREAD</a>
+then there is no distinction between protected and unprotected
+sqlite3_value objects and they can be used interchangeably.  However,
+for maximum code portability it is recommended that applications
+still make the distinction between protected and unprotected
+sqlite3_value objects even when not strictly required.</p>
+
+<p>The sqlite3_value objects that are passed as parameters into the
+implementation of <a href="../appfunc.html">application-defined SQL functions</a> are protected.
+The sqlite3_value objects returned by <a href="../c3ref/vtab_rhs_value.html">sqlite3_vtab_rhs_value()</a>
+are protected.
+The sqlite3_value object returned by
+<a href="../c3ref/column_blob.html">sqlite3_column_value()</a> is unprotected.
+Unprotected sqlite3_value objects may only be used as arguments
+to <a href="../c3ref/result_blob.html">sqlite3_result_value()</a>, <a href="../c3ref/bind_blob.html">sqlite3_bind_value()</a>, and
+<a href="../c3ref/value_dup.html">sqlite3_value_dup()</a>.
+The <a href="../c3ref/value_blob.html">sqlite3_value_type()</a> family of
+interfaces require protected sqlite3_value objects.
+</p><p>19 Methods:
+<div class='columns' style='columns: 17em auto;'>
+<ul style='padding-top:0;'>
+<li><a href='../c3ref/value_blob.html'>sqlite3_value_blob</a></li>
+<li><a href='../c3ref/value_blob.html'>sqlite3_value_bytes</a></li>
+<li><a href='../c3ref/value_blob.html'>sqlite3_value_bytes16</a></li>
+<li><a href='../c3ref/value_blob.html'>sqlite3_value_double</a></li>
+<li><a href='../c3ref/value_dup.html'>sqlite3_value_dup</a></li>
+<li><a href='../c3ref/value_blob.html'>sqlite3_value_encoding</a></li>
+<li><a href='../c3ref/value_dup.html'>sqlite3_value_free</a></li>
+<li><a href='../c3ref/value_blob.html'>sqlite3_value_frombind</a></li>
+<li><a href='../c3ref/value_blob.html'>sqlite3_value_int</a></li>
+<li><a href='../c3ref/value_blob.html'>sqlite3_value_int64</a></li>
+<li><a href='../c3ref/value_blob.html'>sqlite3_value_nochange</a></li>
+<li><a href='../c3ref/value_blob.html'>sqlite3_value_numeric_type</a></li>
+<li><a href='../c3ref/value_blob.html'>sqlite3_value_pointer</a></li>
+<li><a href='../c3ref/value_subtype.html'>sqlite3_value_subtype</a></li>
+<li><a href='../c3ref/value_blob.html'>sqlite3_value_text</a></li>
+<li><a href='../c3ref/value_blob.html'>sqlite3_value_text16</a></li>
+<li><a href='../c3ref/value_blob.html'>sqlite3_value_text16be</a></li>
+<li><a href='../c3ref/value_blob.html'>sqlite3_value_text16le</a></li>
+<li><a href='../c3ref/value_blob.html'>sqlite3_value_type</a></li>
+</ul>
+</div>
+</p>
+<p>See also lists of
+  <a href="objlist.html">Objects</a>,
+  <a href="constlist.html">Constants</a>, and
+  <a href="funclist.html">Functions</a>.</p>
+