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+<!-- keywords: sqlite3_table_column_metadata -->
+<div class=nosearch>
+<a href="../c3ref/intro.html"><h2>SQLite C Interface</h2></a>
+<h2>Extract Metadata About A Column Of A Table</h2>
+</div>
+<blockquote><pre>
+int sqlite3_table_column_metadata(
+  sqlite3 *db,                /* Connection handle */
+  const char *zDbName,        /* Database name or NULL */
+  const char *zTableName,     /* Table name */
+  const char *zColumnName,    /* Column name */
+  char const **pzDataType,    /* OUTPUT: Declared data type */
+  char const **pzCollSeq,     /* OUTPUT: Collation sequence name */
+  int *pNotNull,              /* OUTPUT: True if NOT NULL constraint exists */
+  int *pPrimaryKey,           /* OUTPUT: True if column part of PK */
+  int *pAutoinc               /* OUTPUT: True if column is auto-increment */
+);
+</pre></blockquote>
+<p>
+The sqlite3_table_column_metadata(X,D,T,C,....) routine returns
+information about column C of table T in database D
+on <a href="../c3ref/sqlite3.html">database connection</a> X.  The sqlite3_table_column_metadata()
+interface returns SQLITE_OK and fills in the non-NULL pointers in
+the final five arguments with appropriate values if the specified
+column exists.  The sqlite3_table_column_metadata() interface returns
+SQLITE_ERROR if the specified column does not exist.
+If the column-name parameter to sqlite3_table_column_metadata() is a
+NULL pointer, then this routine simply checks for the existence of the
+table and returns SQLITE_OK if the table exists and SQLITE_ERROR if it
+does not.  If the table name parameter T in a call to
+sqlite3_table_column_metadata(X,D,T,C,...) is NULL then the result is
+undefined behavior.</p>
+
+<p>The column is identified by the second, third and fourth parameters to
+this function. The second parameter is either the name of the database
+(i.e. "main", "temp", or an attached database) containing the specified
+table or NULL. If it is NULL, then all attached databases are searched
+for the table using the same algorithm used by the database engine to
+resolve unqualified table references.</p>
+
+<p>The third and fourth parameters to this function are the table and column
+name of the desired column, respectively.</p>
+
+<p>Metadata is returned by writing to the memory locations passed as the 5th
+and subsequent parameters to this function. Any of these arguments may be
+NULL, in which case the corresponding element of metadata is omitted.</p>
+
+<p><blockquote>
+<table border="1">
+<tr><th> Parameter <th> Output<br>Type <th>  Description</p>
+
+<p><tr><td> 5th <td> const char* <td> Data type
+<tr><td> 6th <td> const char* <td> Name of default collation sequence
+<tr><td> 7th <td> int         <td> True if column has a NOT NULL constraint
+<tr><td> 8th <td> int         <td> True if column is part of the PRIMARY KEY
+<tr><td> 9th <td> int         <td> True if column is <a href="../autoinc.html">AUTOINCREMENT</a>
+</table>
+</blockquote></p>
+
+<p>The memory pointed to by the character pointers returned for the
+declaration type and collation sequence is valid until the next
+call to any SQLite API function.</p>
+
+<p>If the specified table is actually a view, an <a href="../rescode.html">error code</a> is returned.</p>
+
+<p>If the specified column is "rowid", "oid" or "_rowid_" and the table
+is not a <a href="../withoutrowid.html">WITHOUT ROWID</a> table and an
+<a href="../lang_createtable.html#rowid">INTEGER PRIMARY KEY</a> column has been explicitly declared, then the output
+parameters are set for the explicitly declared column. If there is no
+<a href="../lang_createtable.html#rowid">INTEGER PRIMARY KEY</a> column, then the outputs
+for the <a href="../lang_createtable.html#rowid">rowid</a> are set as follows:</p>
+
+<p><pre>
+data type: "INTEGER"
+collation sequence: "BINARY"
+not null: 0
+primary key: 1
+auto increment: 0
+</pre></p>
+
+<p>This function causes all database schemas to be read from disk and
+parsed, if that has not already been done, and returns an error if
+any errors are encountered while loading the schema.
+</p><p>See also lists of
+  <a href="../c3ref/objlist.html">Objects</a>,
+  <a href="../c3ref/constlist.html">Constants</a>, and
+  <a href="../c3ref/funclist.html">Functions</a>.</p>
+