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v/vlib/sqlite/sqlite.v
2021-07-23 12:33:55 +03:00

237 lines
5.0 KiB
V

module sqlite
$if freebsd || openbsd {
#flag -I/usr/local/include
#flag -L/usr/local/lib
}
$if windows {
#flag windows -I@VEXEROOT/thirdparty/sqlite
#flag windows -L@VEXEROOT/thirdparty/sqlite
#flag windows @VEXEROOT/thirdparty/sqlite/sqlite3.o
} $else {
#flag -lsqlite3
}
#include "sqlite3.h"
const (
sqlite_ok = 0
sqlite_error = 1
sqlite_row = 100
sqlite_done = 101
)
struct C.sqlite3 {
}
struct C.sqlite3_stmt {
}
struct Stmt {
stmt &C.sqlite3_stmt
db &DB
}
struct SQLError {
msg string
code int
}
//
pub struct DB {
pub mut:
is_open bool
mut:
conn &C.sqlite3
}
pub fn (db DB) str() string {
return 'sqlite.DB{ conn: ' + ptr_str(db.conn) + ' }'
}
pub struct Row {
pub mut:
vals []string
}
//
fn C.sqlite3_open(&char, &&C.sqlite3) int
fn C.sqlite3_close(&C.sqlite3) int
fn C.sqlite3_last_insert_rowid(&C.sqlite3) i64
//
fn C.sqlite3_prepare_v2(&C.sqlite3, &char, int, &&C.sqlite3_stmt, &&char) int
fn C.sqlite3_step(&C.sqlite3_stmt) int
fn C.sqlite3_finalize(&C.sqlite3_stmt) int
//
fn C.sqlite3_column_name(&C.sqlite3_stmt, int) &char
fn C.sqlite3_column_text(&C.sqlite3_stmt, int) &byte
fn C.sqlite3_column_int(&C.sqlite3_stmt, int) int
fn C.sqlite3_column_int64(&C.sqlite3_stmt, int) i64
fn C.sqlite3_column_double(&C.sqlite3_stmt, int) f64
fn C.sqlite3_column_count(&C.sqlite3_stmt) int
//
fn C.sqlite3_errstr(int) &char
fn C.sqlite3_errmsg(&C.sqlite3) &char
fn C.sqlite3_free(voidptr)
// connect Opens the connection with a database.
pub fn connect(path string) ?DB {
db := &C.sqlite3(0)
code := C.sqlite3_open(&char(path.str), &db)
if code != 0 {
return IError(&SQLError{
msg: unsafe { cstring_to_vstring(&char(C.sqlite3_errstr(code))) }
code: code
})
}
return DB{
conn: db
is_open: true
}
}
// close Closes the DB.
// TODO: For all functions, determine whether the connection is
// closed first, and determine what to do if it is
pub fn (mut db DB) close() ?bool {
code := C.sqlite3_close(db.conn)
if code == 0 {
db.is_open = false
} else {
return IError(&SQLError{
msg: unsafe { cstring_to_vstring(&char(C.sqlite3_errstr(code))) }
code: code
})
}
return true // successfully closed
}
// Only for V ORM
fn get_int_from_stmt(stmt &C.sqlite3_stmt) int {
x := C.sqlite3_step(stmt)
if x != C.SQLITE_OK && x != C.SQLITE_DONE {
C.puts(C.sqlite3_errstr(x))
}
res := C.sqlite3_column_int(stmt, 0)
C.sqlite3_finalize(stmt)
return res
}
// Returns last insert rowid
// https://www.sqlite.org/c3ref/last_insert_rowid.html
pub fn (db DB) last_insert_rowid() i64 {
return C.sqlite3_last_insert_rowid(db.conn)
}
// Returns a single cell with value int.
pub fn (db DB) q_int(query string) int {
stmt := &C.sqlite3_stmt(0)
C.sqlite3_prepare_v2(db.conn, &char(query.str), query.len, &stmt, 0)
C.sqlite3_step(stmt)
res := C.sqlite3_column_int(stmt, 0)
C.sqlite3_finalize(stmt)
return res
}
// Returns a single cell with value string.
pub fn (db DB) q_string(query string) string {
stmt := &C.sqlite3_stmt(0)
defer {
C.sqlite3_finalize(stmt)
}
C.sqlite3_prepare_v2(db.conn, &char(query.str), query.len, &stmt, 0)
C.sqlite3_step(stmt)
val := unsafe { &byte(C.sqlite3_column_text(stmt, 0)) }
return if val != &byte(0) { unsafe { tos_clone(val) } } else { '' }
}
// Execute the query on db, return an array of all the results, alongside any result code.
// Result codes: https://www.sqlite.org/rescode.html
pub fn (db DB) exec(query string) ([]Row, int) {
stmt := &C.sqlite3_stmt(0)
C.sqlite3_prepare_v2(db.conn, &char(query.str), query.len, &stmt, 0)
nr_cols := C.sqlite3_column_count(stmt)
mut res := 0
mut rows := []Row{}
for {
res = C.sqlite3_step(stmt)
// Result Code SQLITE_ROW; Another row is available
if res != 100 {
// C.puts(C.sqlite3_errstr(res))
break
}
mut row := Row{}
for i in 0 .. nr_cols {
val := unsafe { &byte(C.sqlite3_column_text(stmt, i)) }
if val == &byte(0) {
row.vals << ''
} else {
row.vals << unsafe { tos_clone(val) }
}
}
rows << row
}
C.sqlite3_finalize(stmt)
return rows, res
}
// Execute a query, handle error code
// Return the first row from the resulting table
pub fn (db DB) exec_one(query string) ?Row {
rows, code := db.exec(query)
if rows.len == 0 {
return IError(&SQLError{
msg: 'No rows'
code: code
})
} else if code != 101 {
return IError(&SQLError{
msg: unsafe { cstring_to_vstring(&char(C.sqlite3_errstr(code))) }
code: code
})
}
return rows[0]
}
pub fn (db DB) error_message(code int, query string) IError {
msg := unsafe { cstring_to_vstring(&char(C.sqlite3_errmsg(db.conn))) }
return IError(&SQLError{
msg: '$msg ($code) ($query)'
code: code
})
}
// In case you don't expect any result, but still want an error code
// e.g. INSERT INTO ... VALUES (...)
pub fn (db DB) exec_none(query string) int {
_, code := db.exec(query)
return code
}
/*
TODO
pub fn (db DB) exec_param(query string, param string) []Row {
}
*/
pub fn (db DB) create_table(table_name string, columns []string) {
db.exec('create table if not exists $table_name (' + columns.join(',\n') + ')')
}