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authorfiaxh <git@mx.ax.lt>2017-03-02 15:37:32 +0100
committerfiaxh <git@mx.ax.lt>2017-03-02 15:37:32 +0100
commit56bc45ce4d07a7a9a415e9dc8ad2f7c3f3c9e48d (patch)
tree0bd0c2c80cb81179c26282fb3fbe8fd22983f40b /qlite/src/update_builder.vala
downloaddino-56bc45ce4d07a7a9a415e9dc8ad2f7c3f3c9e48d.tar.gz
dino-56bc45ce4d07a7a9a415e9dc8ad2f7c3f3c9e48d.zip
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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())");
+ }
+ }
+
+}
+
+} \ No newline at end of file