Accessing an object through SQLIte database - iphone

Question

I am passing an object to the method in which I am executing a query. My method is:
-(BOOL)searchWordInDatabase:(NSString *)string
{
NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory= [paths objectAtIndex:0];
NSString *path=[documentsDirectory stringByAppendingPathComponent:#"SymbolTalkLanguageElement.sqlite"];
//Open the database
//might have to make database as property
if(sqlite3_open([path UTF8String], &dataBase) ==SQLITE_OK)
{
const char *sql="select ImageName from tblLanguageElement where Category= string";
sqlite3_stmt *statement;
if(sqlite3_prepare(dataBase, sql, -1, &statement, NULL) == SQLITE_OK)
{
while (sqlite3_step(statement) == SQLITE_ROW)
{
NSLog(#"%#",[NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 0)]);
//[list addObject:[NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 0)]];
return YES;
}
}
}
return NO;
}
But I am not getting the value of the String in the query. How can I do it?

Answer 1

There is a mistake in your query. You can not substitute a string like that. Do it in the following way.
NSString *sqlStr = [NSString stringWithFormat:#"select ImageName from tblLanguageElement where Category = '%#'", string];
char *sql = (char *)[sqlStr UTF8String];

Answer 2

Make sure that your database exists at that path you retrieve. And you can bind string variables as follows while executing statements.
const char *sql = "select ImageName from tblLanguageElement where Category = ?";
sqlite3_stmt *statement;
if(sqlite3_prepare(dataBase, sql, -1, &statement, NULL) == SQLITE_OK)
{
sqlite3_bind_text(statement, 1, [string UTF8String], -1, SQLITE_TRANSIENT);
while (sqlite3_step(statement) == SQLITE_ROW)
{
NSLog(#"%#",[NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 0)]);
//[list addObject:[NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 0)]];
return YES;
}
}