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  1. PO
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    <p>I just debugged the same issue, unfinalized statements preventing me from closing my SQLite database on iPhone. <code>sqlite3_next_stmt</code> didn't appear to do anything, but I managed to track down the unfinalized statements manually. My db code was based on the SQLite Books example from Apple, specifically with the lazily prepared statements. Since I was doing this for several different statements, I decided to wrap this part of the code in an auxillary method, looking something like this:</p> <pre><code>- (void)updateIntFieldStatement:(sqlite3_stmt *)update_field_statement WithCString:(char*)cString toValue:(int)value { if (update_field_statement == nil) { if (sqlite3_prepare_v2(database, cString, -1, &update_field_statement, NULL) != SQLITE_OK) { NSAssert1(0, @"Error: failed to prepare statement with message '%s'.", sqlite3_errmsg(database)); } } }</code></pre> <p>I would then call this code like this:</p> <pre><code>[self updateIntFieldStatement:static_statement WithCString:"UPDATE myTable SET myField = ? WHERE pk = ?" toValue:transmitted]; </code></pre> <p>The problem is, <code>static_statement</code> would never get changed, it just stayed nil, so it would get lazily prepared again and again, and my finalization code never got to it. The reason was this part: <code>&amp;update_field_statement</code>. My statement was an <code>sqlite3_stmt *</code>, but <code>sqlite3_prepare_v2</code> takes an <code>sqlite3_stmt **</code>, a handle rather than a simple pointer. The sample code from Apple got the handle by taking the address of the pointer, but when I did this in my auxillary method, I got the local parameter handle, not a global handle. </p> <p>C pointer scoping: 1, me: 0...</p> <p>The solution was to change my auxillary method to take a handle:</p> <pre><code>- (void)updateIntFieldStatement:(sqlite3_stmt **)update_field_statement WithCString:(char*)cString toValue:(int)value { if (*update_field_statement == nil) { if (sqlite3_prepare_v2(database, cString, -1, update_field_statement, NULL) != SQLITE_OK) { NSAssert1(0, @"Error: failed to prepare statement with message '%s'.", sqlite3_errmsg(database)); } } }</code></pre> <p>and then get the handle at a global scope:</p> <pre><code>[self updateIntFieldStatement:&amp;static_statement WithCString:"UPDATE myTable SET myField = ? WHERE pk = ?" toValue:transmitted]; </code></pre> <p>Now the the statement only gets prepared once, <code>static_statement</code> gets assigned correctly when this happens and then eventually finalized, so I can close the database. Hope this helps you or someone else out there!</p>
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    1. POiPhone sqlite3_next_stmt() support
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    1. USMartin Gjaldbaek
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