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using Sqlite;
namespace Qlite {
public errordomain DatabaseError {
ILLEGAL_QUERY,
NOT_SUPPORTED,
OPEN_ERROR,
PREPARE_ERROR,
EXEC_ERROR,
NON_UNIQUE,
ILLEGAL_REFERENCE,
NOT_INITIALIZED
}
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) throws DatabaseError {
Sqlite.config(Config.SERIALIZED);
int ec = Sqlite.Database.open_v2(file_name, out db, OPEN_READWRITE | OPEN_CREATE | 0x00010000);
if (ec != Sqlite.OK) {
throw new DatabaseError.OPEN_ERROR(@"SQLite error: $(db.errcode()) - $(db.errmsg())");
}
this.tables = tables;
start_migration();
}
public void ensure_init() throws DatabaseError {
if (tables == null) throw new DatabaseError.NOT_INITIALIZED(@"Database $file_name was not initialized, call init()");
}
private void start_migration() throws DatabaseError {
meta_table.create_table_at_version(expected_version);
long old_version = 0;
try {
old_version = meta_table.row_with(meta_name, "version")[meta_int_val, -1];
} catch (DatabaseError e) {
old_version = -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();
}
}
}
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) throws DatabaseError {
}
public QueryBuilder select(Column[]? columns = null) throws DatabaseError {
ensure_init();
return new QueryBuilder(this).select(columns);
}
public InsertBuilder insert() throws DatabaseError {
ensure_init();
return new InsertBuilder(this);
}
public UpdateBuilder update(Table table) throws DatabaseError {
ensure_init();
return new UpdateBuilder(this, table);
}
public UpdateBuilder update_named(string table) throws DatabaseError {
ensure_init();
return new UpdateBuilder.for_name(this, table);
}
public DeleteBuilder delete() throws DatabaseError {
ensure_init();
return new DeleteBuilder(this);
}
public RowIterator query_sql(string sql, string[]? args = null) throws DatabaseError {
ensure_init();
return new RowIterator(this, sql, args);
}
public Statement prepare(string sql) throws DatabaseError {
ensure_init();
if (debug) print(@"prepare: $sql\n");
Sqlite.Statement statement;
if (db.prepare_v2(sql, sql.length, out statement) != OK) {
throw new DatabaseError.PREPARE_ERROR(@"SQLite error: $(db.errcode()) - $(db.errmsg())");
}
return statement;
}
public void exec(string sql) throws DatabaseError {
ensure_init();
if (db.exec(sql) != OK) {
throw new DatabaseError.EXEC_ERROR(@"SQLite error: $(db.errcode()) - $(db.errmsg())");
}
}
public bool is_known_column(string table, string field) throws DatabaseError {
ensure_init();
foreach (Table t in tables) {
if (t.is_known_column(field)) return true;
}
return false;
}
}
}
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