63 lines
1.7 KiB
Vala
63 lines
1.7 KiB
Vala
using Sqlite;
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namespace Qlite {
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public class DeleteBuilder : StatementBuilder {
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// DELETE FROM [...]
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private Table? table;
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private string table_name;
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// WHERE [...]
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private string selection = "1";
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private StatementBuilder.AbstractField[] selection_args = {};
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internal DeleteBuilder(Database db) {
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base(db);
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}
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public DeleteBuilder from(Table table) {
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if (this.table != null) error("Qlite Error: ILLEGAL QUERY: cannot use from() multiple times.");
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this.table = table;
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this.table_name = table.name;
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return this;
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}
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public DeleteBuilder from_name(string table) {
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this.table_name = table;
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return this;
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}
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public DeleteBuilder where(string selection, string[]? selection_args = null) {
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if (this.selection != "1") error("selection was already done, but where() was called.");
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this.selection = selection;
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foreach (string arg in selection_args) {
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this.selection_args += new StatementBuilder.StringField(arg);
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}
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return this;
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}
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public DeleteBuilder with<T>(Column<T> column, string comp, T value) {
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selection_args += new Field<T>(column, value);
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selection = @"($selection) AND $(column.name) $comp ?";
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return this;
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}
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internal override Statement prepare() {
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Statement stmt = db.prepare(@"DELETE FROM $table_name WHERE $selection");
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for (int i = 0; i < selection_args.length; i++) {
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selection_args[i].bind(stmt, i+1);
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}
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return stmt;
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}
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public void perform() {
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if (prepare().step() != DONE) {
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critical(@"SQLite error: %d - %s", db.errcode(), db.errmsg());
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}
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}
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}
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}
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