mirror of https://github.com/TakeV-Lambda/dino.git
104 lines
2.9 KiB
Vala
104 lines
2.9 KiB
Vala
using Sqlite;
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namespace Qlite {
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public class UpdateBuilder : StatementBuilder {
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// UPDATE [OR ...]
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private string? or_val;
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// [...]
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private Table? table;
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private string table_name;
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// SET [...]
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private StatementBuilder.AbstractField[] fields = {};
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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 UpdateBuilder(Database db, Table table) {
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base(db);
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this.table = table;
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this.table_name = table.name;
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}
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internal UpdateBuilder.for_name(Database db, string table) {
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base(db);
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this.table_name = table;
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}
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public UpdateBuilder or(string or) {
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this.or_val = or;
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return this;
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}
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public UpdateBuilder set<T>(Column<T> column, T value) {
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fields += new Field<T>(column, value);
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return this;
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}
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public UpdateBuilder set_null<T>(Column<T> column) {
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if (column.not_null) error("Can't set non-null column %s to null", column.name);
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fields += new NullField<T>(column);
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return this;
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}
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public UpdateBuilder where(string selection, string[] selection_args = {}) {
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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 UpdateBuilder 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) $comp ?";
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return this;
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}
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public UpdateBuilder with_null<T>(Column<T> column) {
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selection = @"($selection) AND $(column.name) ISNULL";
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return this;
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}
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public UpdateBuilder without_null<T>(Column<T> column) {
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selection = @"($selection) AND $(column.name) NOT NULL";
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return this;
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}
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internal override Statement prepare() {
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string sql = "UPDATE";
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if (or_val != null) sql += @" OR $((!)or_val)";
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sql += @" $table_name SET ";
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for (int i = 0; i < fields.length; i++) {
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if (i != 0) {
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sql += ", ";
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}
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sql += @"$(((!)fields[i].column).name) = ?";
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}
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sql += @" WHERE $selection";
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Statement stmt = db.prepare(sql);
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for (int i = 0; i < fields.length; i++) {
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fields[i].bind(stmt, i+1);
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}
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for (int i = 0; i < selection_args.length; i++) {
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selection_args[i].bind(stmt, i + fields.length + 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 (fields.length == 0) return;
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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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