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using Sqlite;
namespace Qlite {
public class Database {
private string file_name;
private Sqlite.Database db;
private long expected_version;
private Table[]? tables;
private Column<string?> meta_name = new Column.Text("name") { primary_key = true };
private Column<long> meta_int_val = new Column.Long("int_val");
private Column<string?> meta_text_val = new Column.Text("text_val");
private Table meta_table;
public bool debug = false;
public Database(string file_name, long expected_version) {
this.file_name = file_name;
this.expected_version = expected_version;
meta_table = new Table(this, "_meta");
meta_table.init({meta_name, meta_int_val, meta_text_val});
}
public void init(Table[] tables) {
Sqlite.config(Config.SERIALIZED);
int ec = Sqlite.Database.open_v2(file_name, out db, OPEN_READWRITE | OPEN_CREATE | 0x00010000);
if (ec != Sqlite.OK) {
error(@"SQLite error: %d - %s", db.errcode(), db.errmsg());
}
this.tables = tables;
if (debug) db.trace((message) => print(@"Qlite trace: $message\n"));
start_migration();
}
public void ensure_init() {
if (tables == null) error(@"Database $file_name was not initialized, call init()");
}
private void start_migration() {
try {
exec("BEGIN TRANSACTION");
} catch (Error e) {
error("SQLite error: %d - %s", db.errcode(), db.errmsg());
}
meta_table.create_table_at_version(expected_version);
long old_version = 0;
old_version = meta_table.row_with(meta_name, "version")[meta_int_val, -1];
if (old_version == -1) {
foreach (Table t in tables) {
t.create_table_at_version(expected_version);
}
meta_table.insert().value(meta_name, "version").value(meta_int_val, expected_version).perform();
} else if (expected_version != old_version) {
foreach (Table t in tables) {
t.create_table_at_version(old_version);
}
foreach (Table t in tables) {
t.add_columns_for_version(old_version, expected_version);
}
migrate(old_version);
foreach (Table t in tables) {
t.delete_columns_for_version(old_version, expected_version);
}
if (old_version == -1) {
meta_table.insert().value(meta_name, "version").value(meta_int_val, expected_version).perform();
} else {
meta_table.update().with(meta_name, "=", "version").set(meta_int_val, expected_version).perform();
}
}
foreach (Table t in tables) {
t.post();
}
try {
exec("END TRANSACTION");
} catch (Error e) {
error("SQLite error: %d - %s", db.errcode(), db.errmsg());
}
}
internal int errcode() {
return db.errcode();
}
internal string errmsg() {
return db.errmsg();
}
internal int64 last_insert_rowid() {
return db.last_insert_rowid();
}
// To be implemented by actual implementation if required
// new table columns are added, outdated columns are still present and will be removed afterwards
public virtual void migrate(long old_version) {
}
public QueryBuilder select(Column[]? columns = null) {
ensure_init();
return new QueryBuilder(this).select(columns);
}
internal MatchQueryBuilder match_query(Table table) {
ensure_init();
return new MatchQueryBuilder(this, table);
}
public InsertBuilder insert() {
ensure_init();
return new InsertBuilder(this);
}
public UpdateBuilder update(Table table) {
ensure_init();
return new UpdateBuilder(this, table);
}
public UpsertBuilder upsert(Table table) {
ensure_init();
return new UpsertBuilder(this, table);
}
public UpdateBuilder update_named(string table) {
ensure_init();
return new UpdateBuilder.for_name(this, table);
}
public DeleteBuilder delete() {
ensure_init();
return new DeleteBuilder(this);
}
public RowIterator query_sql(string sql, string[]? args = null) {
ensure_init();
return new RowIterator(this, sql, args);
}
internal Statement prepare(string sql) {
ensure_init();
Sqlite.Statement statement;
if (db.prepare_v2(sql, sql.length, out statement) != OK) {
error("SQLite error: %d - %s: %s", db.errcode(), db.errmsg(), sql);
}
return statement;
}
public void exec(string sql) throws Error {
ensure_init();
if (db.exec(sql) != OK) {
throw new Error(-1, 0, "SQLite error: %d - %s", db.errcode(), db.errmsg());
}
}
public bool is_known_column(string table, string field) {
ensure_init();
foreach (Table t in tables) {
if (t.is_known_column(field)) return true;
}
return false;
}
}
}
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