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v/vlib/sqlite/sqlite.v
Alexander Medvednikov e8f8defc3e ast: SqlExpr
2020-06-16 12:14:22 +02:00

106 lines
2.4 KiB
V

module sqlite
#flag -lsqlite3
#flag freebsd -I/usr/local/include
#flag freebsd -Wl -L/usr/local/lib -lsqlite3
#include "sqlite3.h"
struct C.sqlite3 {}
struct C.sqlite3_stmt {}
pub struct DB {
mut:
conn &C.sqlite3
}
pub struct Row {
pub mut:
vals []string
}
fn C.sqlite3_column_text(voidptr, int) byteptr
fn C.sqlite3_column_int(voidptr, int) int
fn C.sqlite3_open()
fn C.sqlite3_step() int
fn C.sqlite3_prepare_v2()
fn C.sqlite3_finalize()
fn C.sqlite3_column_count(voidptr) int
// Opens the connection with a database.
pub fn connect(path string) ?DB {
db := &C.sqlite3(0)
if C.sqlite3_open(path.str, &db) != 0 {
return error('sqlite db error')
}
return DB{
conn: db
}
}
// 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, query.str, -1, &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)
C.sqlite3_prepare_v2(db.conn, query.str, -1, &stmt, 0)
C.sqlite3_step(stmt)
res := tos_clone(C.sqlite3_column_text(stmt, 0))
C.sqlite3_finalize(stmt)
return res
}
// 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, query.str, -1, &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 {
break
}
mut row := Row{}
for i in 0 .. nr_cols {
val := tos_clone(C.sqlite3_column_text(stmt, i))
row.vals << val
}
rows << row
}
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 || code != 101 {
return error('SQL Error: Rows #$rows.len Return code $code')
}
return rows[0]
}
// 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 {
}
*/