调用C函数示例

#flag -lsqlite3

#include "sqlite3.h"

struct C.sqlite3
struct C.sqlite3_stmt

fn C.sqlite3_column_int(C.sqlite_stmt, int) int

fn main() {
    path := 'sqlite3_users.db'
    db := &C.sqlite3{}
    C.sqlite3_open(path.cstr(), &db)

    query := 'select count(*) from users'
    stmt := &C.sqlite3_stmt{}
    C.sqlite3_prepare_v2(db, query.cstr(), - 1, &stmt, 0)
    C.sqlite3_step(stmt)
    nr_users := C.sqlite3_column_int(res, 0)
    C.sqlite3_finalize(res)
    println(nr_users)
}