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v/vlib/sqlite/sqlite.v

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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
}
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#include "sqlite3.h"
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pub const (
sqlite_ok = 0
sqlite_error = 1
sqlite_row = 100
sqlite_done = 101
)
pub enum SyncMode {
off
normal
full
}
pub enum JournalMode {
off
delete
truncate
persist
memory
}
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struct C.sqlite3 {
}
struct C.sqlite3_stmt {
}
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[heap]
struct Stmt {
stmt &C.sqlite3_stmt
db &DB
}
struct SQLError {
MessageError
}
//
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[heap]
pub struct DB {
pub mut:
is_open bool
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mut:
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conn &C.sqlite3
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}
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pub fn (db &DB) str() string {
return 'sqlite.DB{ conn: ' + ptr_str(db.conn) + ' }'
}
pub struct Row {
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pub mut:
vals []string
}
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//
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fn C.sqlite3_open(&char, &&C.sqlite3) int
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fn C.sqlite3_close(&C.sqlite3) int
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fn C.sqlite3_busy_timeout(db &C.sqlite3, ms int) int
fn C.sqlite3_last_insert_rowid(&C.sqlite3) i64
//
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fn C.sqlite3_prepare_v2(&C.sqlite3, &char, int, &&C.sqlite3_stmt, &&char) int
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fn C.sqlite3_step(&C.sqlite3_stmt) int
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fn C.sqlite3_finalize(&C.sqlite3_stmt) int
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//
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fn C.sqlite3_column_name(&C.sqlite3_stmt, int) &char
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fn C.sqlite3_column_text(&C.sqlite3_stmt, int) &u8
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fn C.sqlite3_column_int(&C.sqlite3_stmt, int) int
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fn C.sqlite3_column_int64(&C.sqlite3_stmt, int) i64
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fn C.sqlite3_column_double(&C.sqlite3_stmt, int) f64
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fn C.sqlite3_column_count(&C.sqlite3_stmt) int
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//
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fn C.sqlite3_errstr(int) &char
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fn C.sqlite3_errmsg(&C.sqlite3) &char
fn C.sqlite3_free(voidptr)
// connect Opens the connection with a database.
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pub fn connect(path string) ?DB {
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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
})
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}
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
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}
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// 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 {
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C.puts(C.sqlite3_errstr(x))
}
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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
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pub fn (db &DB) last_insert_rowid() i64 {
return C.sqlite3_last_insert_rowid(db.conn)
}
// Returns a single cell with value int.
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pub fn (db &DB) q_int(query string) int {
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stmt := &C.sqlite3_stmt(0)
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defer {
C.sqlite3_finalize(stmt)
}
C.sqlite3_prepare_v2(db.conn, &char(query.str), query.len, &stmt, 0)
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C.sqlite3_step(stmt)
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res := C.sqlite3_column_int(stmt, 0)
return res
}
// Returns a single cell with value string.
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pub fn (db &DB) q_string(query string) string {
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stmt := &C.sqlite3_stmt(0)
defer {
C.sqlite3_finalize(stmt)
}
C.sqlite3_prepare_v2(db.conn, &char(query.str), query.len, &stmt, 0)
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C.sqlite3_step(stmt)
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val := unsafe { &u8(C.sqlite3_column_text(stmt, 0)) }
return if val != &u8(0) { unsafe { tos_clone(val) } } else { '' }
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}
// Execute the query on db, return an array of all the results, alongside any result code.
// Result codes: https://www.sqlite.org/rescode.html
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[manualfree]
pub fn (db &DB) exec(query string) ([]Row, int) {
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stmt := &C.sqlite3_stmt(0)
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defer {
C.sqlite3_finalize(stmt)
}
C.sqlite3_prepare_v2(db.conn, &char(query.str), query.len, &stmt, 0)
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nr_cols := C.sqlite3_column_count(stmt)
mut res := 0
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mut rows := []Row{}
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for {
res = C.sqlite3_step(stmt)
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// Result Code SQLITE_ROW; Another row is available
if res != 100 {
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// C.puts(C.sqlite3_errstr(res))
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break
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}
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mut row := Row{}
for i in 0 .. nr_cols {
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val := unsafe { &u8(C.sqlite3_column_text(stmt, i)) }
if val == &u8(0) {
row.vals << ''
} else {
row.vals << unsafe { tos_clone(val) }
}
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}
rows << row
}
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return rows, res
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}
// Execute a query, handle error code
// Return the first row from the resulting table
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[manualfree]
pub fn (db &DB) exec_one(query string) ?Row {
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rows, code := db.exec(query)
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defer {
unsafe { rows.free() }
}
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
})
}
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res := rows[0]
return res
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}
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[manualfree]
pub fn (db &DB) error_message(code int, query string) IError {
errmsg := unsafe { cstring_to_vstring(&char(C.sqlite3_errmsg(db.conn))) }
msg := '$errmsg ($code) ($query)'
unsafe { errmsg.free() }
return SQLError{
msg: msg
code: code
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}
}
// Execute a query returning only the result code.
// In case you don't expect any row results, but still want a result code.
// e.g. INSERT INTO ... VALUES (...)
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pub fn (db &DB) exec_none(query string) int {
stmt := &C.sqlite3_stmt(0)
C.sqlite3_prepare_v2(db.conn, &char(query.str), query.len, &stmt, 0)
code := C.sqlite3_step(stmt)
C.sqlite3_finalize(stmt)
return code
}
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/*
TODO
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pub fn (db &DB) exec_param(query string, param string) []Row {
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}
*/
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// Issue a "create table if not exists" command to the db.
// Creates table named 'table_name', with columns generated from 'columns' array.
// Default columns type will be TEXT.
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pub fn (db &DB) create_table(table_name string, columns []string) {
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db.exec('create table if not exists $table_name (' + columns.join(',\n') + ')')
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}
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// Set a busy timeout in milliseconds.
// Sleeps for a specified amount of time when a table is locked. The handler
// will sleep multiple times until at least "ms" milliseconds of sleeping have accumulated.
// (see https://www.sqlite.org/c3ref/busy_timeout.html)
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pub fn (db &DB) busy_timeout(ms int) int {
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return C.sqlite3_busy_timeout(db.conn, ms)
}
// Sets disk synchronization mode,
// which controls how aggressively SQLite will write data to physical storage.
// off: No syncs at all. (fastest)
// normal: Sync after each sequence of critical disk operations.
// full: Sync after each critical disk operation (slowest).
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pub fn (db &DB) synchronization_mode(sync_mode SyncMode) {
if sync_mode == .off {
db.exec('pragma synchronous = OFF;')
} else if sync_mode == .full {
db.exec('pragma synchronous = FULL;')
} else {
db.exec('pragma synchronous = NORMAL;')
}
}
// Controls how the journal file is stored and processed.
// off: No journal record is kept. (fastest)
// memory: Journal record is held in memory, rather than on disk.
// delete: At the conclusion of a transaction, journal file is deleted.
// truncate: Journal file is truncated to a length of zero bytes.
// persist: Journal file is left in place, but the header is overwritten to indicate journal is no longer valid.
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pub fn (db &DB) journal_mode(journal_mode JournalMode) {
if journal_mode == .off {
db.exec('pragma journal_mode = OFF;')
} else if journal_mode == .delete {
db.exec('pragma journal_mode = DELETE;')
} else if journal_mode == .truncate {
db.exec('pragma journal_mode = TRUNCATE;')
} else if journal_mode == .persist {
db.exec('pragma journal_mode = PERSIST;')
} else if journal_mode == .memory {
db.exec('pragma journal_mode = MEMORY;')
} else {
db.exec('pragma journal_mode = MEMORY;')
}
}