add db module
This commit is contained in:
Charles Kralapp
parent
2d40445ee3
commit
4db2ebc024
|
|
@ -5,6 +5,7 @@ maintainer = "admin@alfrescocavern.com"
|
|||
name = "fortran-micro-httpd"
|
||||
version = "0.1.0"
|
||||
[build]
|
||||
link = ["pthread", "libdill"]
|
||||
auto-examples = true
|
||||
auto-executables = true
|
||||
auto-tests = false
|
||||
|
|
@ -16,3 +17,4 @@ implicit-external = false
|
|||
implicit-typing = false
|
||||
source-form = "free"
|
||||
[dependencies]
|
||||
fortran-sqlite3 = { git = "https://github.com/interkosmos/fortran-sqlite3.git" }
|
||||
|
|
@ -0,0 +1,164 @@
|
|||
! db.f90
|
||||
module db
|
||||
!! Database abstraction layer.
|
||||
use, intrinsic :: iso_c_binding
|
||||
use :: sqlite3
|
||||
implicit none
|
||||
private
|
||||
|
||||
integer, parameter, public :: DB_OK = SQLITE_OK
|
||||
|
||||
type, public :: db_type
|
||||
type(c_ptr) :: ptr = c_null_ptr
|
||||
end type db_type
|
||||
|
||||
public :: db_close
|
||||
public :: db_open
|
||||
public :: db_create_users
|
||||
public :: db_get_users
|
||||
public :: db_add_user
|
||||
public :: db_delete_user
|
||||
|
||||
private :: db_error
|
||||
private :: db_exec
|
||||
contains
|
||||
|
||||
|
||||
integer function db_open(db, path) result(rc)
|
||||
!! Opens database.
|
||||
type(db_type), intent(inout) :: db
|
||||
character(len=*), intent(in) :: path
|
||||
|
||||
rc = sqlite3_open(path, db%ptr)
|
||||
call db_error(rc, 'sqlite3_open()')
|
||||
end function db_open
|
||||
|
||||
integer function db_exec(db, query) result(rc)
|
||||
!! Executes SQLite query.
|
||||
type(db_type), intent(inout) :: db
|
||||
character(len=*), intent(in) :: query
|
||||
character(len=:), allocatable :: err_msg
|
||||
|
||||
rc = sqlite3_exec(db%ptr, query, c_null_ptr, c_null_ptr, err_msg)
|
||||
call db_error(rc, 'sqlite3_exec()', err_msg)
|
||||
end function db_exec
|
||||
|
||||
integer function db_close(db) result(rc)
|
||||
!! Closes database.
|
||||
type(db_type), intent(inout) :: db
|
||||
|
||||
rc = sqlite3_close(db%ptr)
|
||||
call db_error(rc, 'sqlite3_close()')
|
||||
end function db_close
|
||||
|
||||
integer function db_create_users(db) result(rc)
|
||||
!! Creates database tables.
|
||||
type(db_type), intent(inout) :: db
|
||||
|
||||
! Create table "users".
|
||||
rc = db_exec(db, "CREATE TABLE users " &
|
||||
// "(id INTEGER PRIMARY KEY ASC, " &
|
||||
// "username TEXT, password TEXT, " &
|
||||
// "apperance TEXT, x_pos INTEGER, " &
|
||||
// "y_pos INTEGER, last_login INTEGER, " &
|
||||
// "created INTEGER);")
|
||||
if (rc /= SQLITE_OK) return
|
||||
end function db_create_users
|
||||
|
||||
integer function db_add_user(db, name) result(rc)
|
||||
!! Adds student to database.
|
||||
type(db_type), intent(inout) :: db
|
||||
character(len=:), intent(in) :: username
|
||||
character(len=:), intent(in) :: password
|
||||
character(len=:), intent(in) :: apperance
|
||||
integer, intent(in) :: x_pos
|
||||
integer, intent(in) :: y_pos
|
||||
integer, intent(in) :: last_login
|
||||
integer, intent(in) :: created
|
||||
type(c_ptr) :: stmt
|
||||
|
||||
! Insert values through prepared statement.
|
||||
rc = sqlite3_prepare_v2(db%ptr, "INSERT INTO users(username, password, "
|
||||
//"apperance, x_pos, y_pos, last_login, created) VALUES (?,?,?,?,?,?,?)", stmt)
|
||||
call db_error(rc, 'sqlite3_prepare_v2()')
|
||||
|
||||
rc = sqlite3_bind_text(stmt, 1, username)
|
||||
call db_error(rc, 'sqlite3_bind_text()')
|
||||
rc = sqlite3_bind_text(stmt, 2, password)
|
||||
call db_error(rc, 'sqlite3_bind_text()')
|
||||
rc = sqlite3_bind_text(stmt, 3, apperance)
|
||||
call db_error(rc, 'sqlite3_bind_text()')
|
||||
rc = sqlite3_bind_integer(stmt, 4, x_pos)
|
||||
call db_error(rc, 'sqlite3_bind_integer()')
|
||||
rc = sqlite3_bind_integer(stmt, 5, y_pos)
|
||||
call db_error(rc, 'sqlite3_bind_integer()')
|
||||
rc = sqlite3_bind_integer(stmt, 6, last_login)
|
||||
call db_error(rc, 'sqlite3_bind_integer()')
|
||||
rc = sqlite3_bind_integer(stmt, 7, created)
|
||||
call db_error(rc, 'sqlite3_bind_integer()')
|
||||
|
||||
! Insert bound value into database.
|
||||
rc = sqlite3_step(stmt)
|
||||
call db_error(rc, 'sqlite3_step()')
|
||||
|
||||
! Clean-up prepared statement.
|
||||
rc = sqlite3_finalize(stmt)
|
||||
call db_error(rc, 'sqlite3_finalize()')
|
||||
end function db_add_student
|
||||
|
||||
integer function db_get_users(db) result(rc)
|
||||
!! Prints number of courses per student to standard output.
|
||||
type(db_type), intent(inout) :: db
|
||||
|
||||
type(c_ptr) :: stmt
|
||||
character(len=24) :: username
|
||||
character(len=24) :: password
|
||||
|
||||
rc = sqlite3_prepare_v2(db%ptr, &
|
||||
"SELECT username " // &
|
||||
"FROM users;", stmt)
|
||||
call db_error(rc, 'sqlite3_prepare_v2()')
|
||||
|
||||
step_loop: do
|
||||
rc = sqlite3_step(stmt)
|
||||
|
||||
select case (rc)
|
||||
case (SQLITE_ROW)
|
||||
username = sqlite3_column_text(stmt, 0)
|
||||
password = sqlite3_column_text(stmt, 1)
|
||||
print '(a),(a)', username, password
|
||||
|
||||
case (SQLITE_DONE)
|
||||
exit step_loop
|
||||
|
||||
case default
|
||||
call db_error(rc, 'sqlite3_step()')
|
||||
exit step_loop
|
||||
end select
|
||||
end do step_loop
|
||||
|
||||
rc = sqlite3_finalize(stmt)
|
||||
call db_error(rc, 'sqlite3_finalize()')
|
||||
end function db_get_users
|
||||
|
||||
subroutine db_error(code, proc, err_msg)
|
||||
!! Prints error message.
|
||||
integer, intent(in) :: code
|
||||
character(len=*), intent(in), optional :: proc
|
||||
character(len=*), intent(in), optional :: err_msg
|
||||
|
||||
if (code == SQLITE_OK .or. code == SQLITE_DONE) return
|
||||
|
||||
if (present(proc) .and. present(err_msg)) then
|
||||
print '(a, ": ", a, " (", i0, ")")', proc, err_msg, code
|
||||
return
|
||||
end if
|
||||
|
||||
if (present(proc)) then
|
||||
print '(a, ": ", i0)', proc, code
|
||||
return
|
||||
end if
|
||||
|
||||
print '("unknown error: ", i0)', code
|
||||
end subroutine db_error
|
||||
end module db
|
||||
Loading…
Reference in New Issue