Replace old Sqlite api with new v2 function calls

[tenmalin]

According to official sqlite3 document, several apis can be replaced with newer version (suffix with v2). Take prepare as an example,
"The sqlite3_prepare_v2() and sqlite3_prepare16_v2() interfaces are recommended for all new programs. The two older interfaces are retained for backwards compatibility, but their use is discouraged. In the "v2" interfaces, the prepared statement that is returned (the sqlite3_stmt object) contains a copy of the original SQL text."