Move qlite into libdino

1 files changed, 62 insertions, 0 deletions

diff --git a/libdino/src/qlite/delete_builder.vala b/libdino/src/qlite/delete_builder.vala
new file mode 100644
index 00000000..df63bba6
--- /dev/null
+++ b/libdino/src/qlite/delete_builder.vala
@@ -0,0 +1,62 @@
+using Sqlite;
+
+namespace Dino.Qlite {
+
+public class DeleteBuilder : StatementBuilder {
+
+    // DELETE FROM [...]
+    private Table? table;
+    private string table_name;
+
+    // WHERE [...]
+    private string selection = "1";
+    private StatementBuilder.AbstractField[] selection_args = {};
+
+    internal DeleteBuilder(Database db) {
+        base(db);
+    }
+
+    public DeleteBuilder from(Table table) {
+        if (this.table != null) error("Qlite Error: 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 (this.selection != "1") error("selection was already done, but where() was called.");
+        this.selection = selection;
+        foreach (string arg in selection_args) {
+            this.selection_args += new StatementBuilder.StringField(arg);
+        }
+        return this;
+    }
+
+    public DeleteBuilder with<T>(Column<T> column, string comp, T value) {
+        selection_args += new Field<T>(column, value);
+        selection = @"($selection) AND $(column.name) $comp ?";
+        return this;
+    }
+
+    internal override Statement prepare() {
+        Statement stmt = db.prepare(@"DELETE FROM $table_name 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) {
+            critical(@"SQLite error: %d - %s", db.errcode(), db.errmsg());
+        }
+    }
+
+}
+
+}