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POProblem with FMDB and insert value in the "executeQuery:" from a searchString
 

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  1. POProblem with FMDB and insert value in the "executeQuery:" from a searchString
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    <p>While building a Search for my app i ran into a problem whilst using the FMDB SQLite Wrapper (https://github.com/ccgus/fmdb).</p> <p>When I search my database with this SQL Command, everything is fine. 13 objects are returned and I can use them.</p> <pre><code>FMResultSet *rs = [db executeQuery:@"SELECT * FROM ZARTICLE WHERE ZTITLEDE LIKE '%Daimler%'"]; </code></pre> <p>But when i try to insert the searchQuery from the User Input like this:</p> <pre><code>FMResultSet *rs = [db executeQuery:@"SELECT * FROM ZARTICLE WHERE ZTITLEDE LIKE (?)", theSearchQuery]; </code></pre> <p>... the value is dont be inserted into SQL Command. And I dont get any returned objects from the DB. even if the String (theSearchQuery) is the same written in the first example.</p> <p>Additionaly I post a part from the documentation of FMDB for your convinience. :)</p> <pre><code>Data Sanitization </code></pre> <p>When providing a SQL statement to FMDB, you should not attempt to "sanitize" any values before insertion. Instead, you should use the standard SQLite binding syntax:</p> <p>INSERT INTO myTable VALUES (?, ?, ?) The ? character is recognized by SQLite as a placeholder for a value to be inserted. The execution methods all accept a variable number of arguments (or a representation of those arguments, such as an NSArray or a va_list), which are properly escaped for you.</p> <p>Thus, you SHOULD NOT do this (or anything like this):</p> <p>[db executeUpdate:[NSString stringWithFormat:@"INSERT INTO myTable VALUES (%@)", @"this has \" lots of ' bizarre \" quotes '"]]; Instead, you SHOULD do:</p> <p>[db executeUpdate:@"INSERT INTO myTable VALUES (?)", @"this has \" lots of ' bizarre \" quotes '"]; All arguments provided to the -executeUpdate: method (or any of the variants that accept a va_list as a parameter) must be objects. The following will not work (and will result in a crash):</p> <p>[db executeUpdate:@"INSERT INTO myTable VALUES (?)", 42]; The proper way to insert a number is to box it in an NSNumber object:</p> <p>[db executeUpdate:@"INSERT INTO myTable VALUES (?)", [NSNumber numberWithInt:42]]; Alternatively, you can use the -execute*WithFormat: variant to use NSString-style substitution:</p> <p>[db executeUpdateWithFormat:@"INSERT INTO myTable VALUES (%d)", 42]; Internally, the -execute*WithFormat: methods are properly boxing things for you. The following percent modifiers are recognized: %@, %c, %s, %d, %D, %i, %u, %U, %hi, %hu, %qi, %qu, %f, %g, %ld, %lu, %lld, and %llu. Using a modifier other than those will have unpredictable results. If, for some reason, you need the % character to appear in your SQL statement, you should use %%.</p>
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    1. COok i solved this: I prepared the whole SQL Command in an extra [NSString stringWithFormat:] so i left the possibility to use the FMDB inserts.
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