blob: 5483b652264dbf5867f9c33c5da2c6e999bf8570 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
|
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) throws DatabaseError {
if (this.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) throws DatabaseError {
if (this.selection != "1") throw new DatabaseError.ILLEGAL_QUERY("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() throws DatabaseError {
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() throws DatabaseError {
if (prepare().step() != DONE) {
throw new DatabaseError.EXEC_ERROR(@"SQLite error: $(db.errcode()) - $(db.errmsg())");
}
}
}
}
|
