The first argument to the callback is just a copy of the fourth argument to sqlite_exec() This parameter can be used to pass arbitrary information through to the callback function from client code. -The second argument is the number columns in the query result. +The second argument is the number of columns in the query result. The third argument is an array of pointers to strings where each string is a single column of the result for that record. Note that the callback function reports a NULL value in the database as a NULL pointer, @@ -279,9 +279,9 @@ schema. This is the return code for such cases. Retrying the command usually will clear the problem.
SQLite cannot store more than about 64K of data in a single row -of a single table. If you attempt to store more than 64K in a single -row, this is the return code you get. +
SQLite will not store more than about 1 megabyte of data in a single +row of a single table. If you attempt to store more than 1 megabyte +in a single row, this is the return code you get.
This constant is returned if the SQL statement would have violated @@ -508,14 +508,14 @@ be changed at run-time. This is a compile-time option only. The sqlite_encoding character string just tells you how the library was compiled.
-The sqlite_busy_handler() procedure can be used to register a busy callback with an open SQLite database. The busy callback will -be invoked whenever SQLite tries to open a file that is locked. +be invoked whenever SQLite tries to access a database that is locked. The callback will typically do some other useful work, or perhaps sleep, in order to give the lock a chance to clear. If the callback returns -non-zero, then SQLite tries again to open the database and the cycle +non-zero, then SQLite tries again to access the database and the cycle repeats. If the callback returns zero, then SQLite aborts the current operation and returns SQLITE_BUSY.
@@ -526,8 +526,8 @@ the first argument to the busy callback. When SQLite invokes the busy callback, it sends it three arguments: the generic pointer that was passed in as the third argument to sqlite_busy_handler, the name of the database table or index that the library is trying -to open, and the number of times that the library has attempted to -open the database table or index. +to access, and the number of times that the library has attempted to +access the database table or index.For the common case where we want the busy callback to sleep, the SQLite library provides a convenience routine sqlite_busy_timeout().