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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 = "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) {
error(@"SQLite error: %d - %s", db.errcode(), db.errmsg());
}
}
}
}
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