1 files changed, 75 insertions, 0 deletions
diff --git a/qlite/src/delete_builder.vala b/qlite/src/delete_builder.vala
new file mode 100644
index 00000000..5999dc40
--- /dev/null
+++ b/qlite/src/delete_builder.vala
@@ -0,0 +1,75 @@
+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