134 lines
4.4 KiB
Vala
134 lines
4.4 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.Field[] fields;
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// WHERE [...]
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private string selection;
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private StatementBuilder.Field[] selection_args;
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protected 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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if (fields == null) {
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fields = { new StatementBuilder.Field<T>(column, value) };
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} else {
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StatementBuilder.Field[] fields_new = new StatementBuilder.Field[fields.length+1];
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for (int i = 0; i < fields.length; i++) {
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fields_new[i] = fields[i];
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}
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fields_new[fields.length] = new Field<T>(column, value);
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fields = fields_new;
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}
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return this;
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}
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public UpdateBuilder set_null<T>(Column<T> column) throws DatabaseError {
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if (column.not_null) throw new DatabaseError.ILLEGAL_QUERY(@"Can't set non-null column $(column.name) to null");
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if (fields == null) {
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fields = { new NullField<T>(column) };
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} else {
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StatementBuilder.Field[] fields_new = new StatementBuilder.Field[fields.length+1];
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for (int i = 0; i < fields.length; i++) {
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fields_new[i] = fields[i];
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}
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fields_new[fields.length] = new NullField<T>(column);
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fields = fields_new;
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}
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return this;
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}
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public UpdateBuilder where(string selection, string[]? selection_args = null) throws DatabaseError {
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if (this.selection != null) throw new DatabaseError.ILLEGAL_QUERY("selection was already done, but where() was called.");
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this.selection = selection;
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if (selection_args != null) {
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this.selection_args = new StatementBuilder.Field[selection_args.length];
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for (int i = 0; i < selection_args.length; i++) {
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this.selection_args[i] = new StatementBuilder.StringField(selection_args[i]);
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}
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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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if (selection == null) {
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selection = @"$(column.name) $comp ?";
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selection_args = { new StatementBuilder.Field<T>(column, value) };
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} else {
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selection = @"($selection) AND $(column.name) $comp ?";
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StatementBuilder.Field[] selection_args_new = new StatementBuilder.Field[selection_args.length+1];
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for (int i = 0; i < selection_args.length; i++) {
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selection_args_new[i] = selection_args[i];
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}
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selection_args_new[selection_args.length] = new Field<T>(column, value);
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selection_args = selection_args_new;
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}
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return this;
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}
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public UpdateBuilder with_null<T>(Column<T> column) {
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selection = @"($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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public override Statement prepare() throws DatabaseError {
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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() throws DatabaseError {
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if (fields == null || fields.length == 0) return;
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if (prepare().step() != DONE) {
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throw new DatabaseError.EXEC_ERROR(@"SQLite error: $(db.errcode()) - $(db.errmsg())");
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}
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}
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}
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} |