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-rw-r--r--qlite/src/delete_builder.vala75
1 files changed, 75 insertions, 0 deletions
diff --git a/qlite/src/delete_builder.vala b/qlite/src/delete_builder.vala
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+using Sqlite;
+
+namespace Qlite {
+
+public class DeleteBuilder : StatementBuilder {
+
+ // DELETE FROM [...]
+ private Table table;
+ private string table_name;
+
+ // WHERE [...]
+ private string selection;
+ private StatementBuilder.Field[] selection_args;
+
+ protected DeleteBuilder(Database db) {
+ base(db);
+ }
+
+ public DeleteBuilder from(Table table) {
+ if (table != null) throw new DatabaseError.ILLEGAL_QUERY("cannot use from() multiple times.");
+ this.table = table;
+ this.table_name = table.name;
+ return this;
+ }
+
+ public DeleteBuilder from_name(string table) {
+ this.table_name = table;
+ return this;
+ }
+
+ public DeleteBuilder where(string selection, string[]? selection_args = null) {
+ if (selection != null) throw new DatabaseError.ILLEGAL_QUERY("selection was already done, but where() was called.");
+ this.selection = selection;
+ if (selection_args != null) {
+ this.selection_args = new StatementBuilder.Field[selection_args.length];
+ for (int i = 0; i < selection_args.length; i++) {
+ this.selection_args[i] = new StatementBuilder.StringField(selection_args[i]);
+ }
+ }
+ return this;
+ }
+
+ public DeleteBuilder with<T>(Column<T> column, string comp, T value) {
+ if (selection == null) {
+ selection = @"$(column.name) $comp ?";
+ selection_args = { new StatementBuilder.Field<T>(column, value) };
+ } else {
+ selection = @"($selection) AND $(column.name) $comp ?";
+ StatementBuilder.Field[] selection_args_new = new StatementBuilder.Field[selection_args.length+1];
+ for (int i = 0; i < selection_args.length; i++) {
+ selection_args_new[i] = selection_args[i];
+ }
+ selection_args_new[selection_args.length] = new Field<T>(column, value);
+ selection_args = selection_args_new;
+ }
+ return this;
+ }
+
+ public override Statement prepare() {
+ Statement stmt = db.prepare(@"DELETE FROM $table_name $(selection != null ? @"WHERE $selection": "")");
+ for (int i = 0; i < selection_args.length; i++) {
+ selection_args[i].bind(stmt, i+1);
+ }
+ return stmt;
+ }
+
+ public void perform() {
+ if (prepare().step() != DONE) {
+ throw new DatabaseError.EXEC_ERROR(@"SQLite error: $(db.errcode()) - $(db.errmsg())");
+ }
+ }
+
+}
+
+} \ No newline at end of file