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1 files changed, 133 insertions, 0 deletions

diff --git a/qlite/src/update_builder.vala b/qlite/src/update_builder.vala
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+using Sqlite;
+
+namespace Qlite {
+
+public class UpdateBuilder : StatementBuilder {
+
+    // UPDATE [OR ...]
+    private string or_val;
+
+    // [...]
+    private Table table;
+    private string table_name;
+
+    // SET [...]
+    private StatementBuilder.Field[] fields;
+
+    // WHERE [...]
+    private string selection;
+    private StatementBuilder.Field[] selection_args;
+
+    protected UpdateBuilder(Database db, Table table) {
+        base(db);
+        this.table = table;
+        this.table_name = table.name;
+    }
+
+    internal UpdateBuilder.for_name(Database db, string table) {
+        base(db);
+        this.table_name = table;
+    }
+
+    public UpdateBuilder or(string or) {
+        this.or_val = or;
+        return this;
+    }
+
+    public UpdateBuilder set<T>(Column<T> column, T value) {
+        if (fields == null) {
+            fields = { new StatementBuilder.Field<T>(column, value) };
+        } else {
+            StatementBuilder.Field[] fields_new = new StatementBuilder.Field[fields.length+1];
+            for (int i = 0; i < fields.length; i++) {
+                fields_new[i] = fields[i];
+            }
+            fields_new[fields.length] = new Field<T>(column, value);
+            fields = fields_new;
+        }
+        return this;
+    }
+
+    public UpdateBuilder set_null<T>(Column<T> column) {
+        if (column.not_null) throw new DatabaseError.ILLEGAL_QUERY(@"Can't set non-null column $(column.name) to null");
+        if (fields == null) {
+            fields = { new NullField<T>(column) };
+        } else {
+            StatementBuilder.Field[] fields_new = new StatementBuilder.Field[fields.length+1];
+            for (int i = 0; i < fields.length; i++) {
+                fields_new[i] = fields[i];
+            }
+            fields_new[fields.length] = new NullField<T>(column);
+            fields = fields_new;
+        }
+        return this;
+    }
+
+    public UpdateBuilder where(string selection, string[]? selection_args = null) {
+        if (selection != null) throw new DatabaseError.ILLEGAL_QUERY("selection was already done, but where() was called.");
+        this.selection = selection;
+        if (selection_args != null) {
+            this.selection_args = new StatementBuilder.Field[selection_args.length];
+            for (int i = 0; i < selection_args.length; i++) {
+                this.selection_args[i] = new StatementBuilder.StringField(selection_args[i]);
+            }
+        }
+        return this;
+    }
+
+    public UpdateBuilder with<T>(Column<T> column, string comp, T value) {
+        if (selection == null) {
+            selection = @"$(column.name) $comp ?";
+            selection_args = { new StatementBuilder.Field<T>(column, value) };
+        } else {
+            selection = @"($selection) AND $(column.name) $comp ?";
+            StatementBuilder.Field[] selection_args_new = new StatementBuilder.Field[selection_args.length+1];
+            for (int i = 0; i < selection_args.length; i++) {
+                selection_args_new[i] = selection_args[i];
+            }
+            selection_args_new[selection_args.length] = new Field<T>(column, value);
+            selection_args = selection_args_new;
+        }
+        return this;
+    }
+
+    public UpdateBuilder with_null<T>(Column<T> column) {
+        selection = @"($selection) AND $(column.name) ISNULL";
+        return this;
+    }
+
+    public UpdateBuilder without_null<T>(Column<T> column) {
+        selection = @"($selection) AND $(column.name) NOT NULL";
+        return this;
+    }
+
+    public override Statement prepare() throws DatabaseError {
+        string sql = "UPDATE";
+        if (or_val != null) sql += @" OR $or_val";
+        sql += @" $table_name SET ";
+        for (int i = 0; i < fields.length; i++) {
+            if (i != 0) {
+                sql += ", ";
+            }
+            sql += @"$(fields[i].column.name) = ?";
+        }
+        sql += @" WHERE $selection";
+        Statement stmt = db.prepare(sql);
+        for (int i = 0; i < fields.length; i++) {
+            fields[i].bind(stmt, i+1);
+        }
+        for (int i = 0; i < selection_args.length; i++) {
+            selection_args[i].bind(stmt, i + fields.length + 1);
+        }
+        return stmt;
+    }
+
+    public void perform() throws DatabaseError {
+        if (prepare().step() != DONE) {
+            throw new DatabaseError.EXEC_ERROR(@"SQLite error: $(db.errcode()) - $(db.errmsg())");
+        }
+    }
+
+}
+
+}
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