typedef struct sqlite3_stmt sqlite3_stmt;
An instance of this object represents a single SQL statement that has been compiled into binary form and is ready to be evaluated.
Think of each SQL statement as a separate computer program. The original SQL text is source code. A prepared statement object is the compiled object code. All SQL must be converted into a prepared statement before it can be run.
The life-cycle of a prepared statement object usually goes like this:
Constructors: sqlite3_prepare(), sqlite3_prepare16(), sqlite3_prepare16_v2(), sqlite3_prepare_v2()
Destructor: sqlite3_finalize()