60 lines
1.4 KiB
Dart
60 lines
1.4 KiB
Dart
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import 'builder.dart';
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/// Builds a SQL `WHERE` clause.
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abstract class QueryWhere {
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final Set<QueryWhere> _and = Set();
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final Set<QueryWhere> _not = Set();
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final Set<QueryWhere> _or = Set();
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Iterable<SqlExpressionBuilder> get expressionBuilders;
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void and(QueryWhere other) {
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_and.add(other);
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}
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void not(QueryWhere other) {
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_not.add(other);
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}
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void or(QueryWhere other) {
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_or.add(other);
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}
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String compile({String tableName}) {
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var b = StringBuffer();
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int i = 0;
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for (var builder in expressionBuilders) {
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var key = builder.columnName;
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if (tableName != null) key = '$tableName.$key';
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if (builder.hasValue) {
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if (i++ > 0) b.write(' AND ');
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if (builder is DateTimeSqlExpressionBuilder ||
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(builder is JsonSqlExpressionBuilder && builder.hasRaw)) {
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if (tableName != null) b.write('$tableName.');
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b.write(builder.compile());
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} else {
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b.write('$key ${builder.compile()}');
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}
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}
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}
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for (var other in _and) {
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var sql = other.compile();
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if (sql.isNotEmpty) b.write(' AND $sql');
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}
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for (var other in _not) {
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var sql = other.compile();
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if (sql.isNotEmpty) b.write(' NOT $sql');
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}
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for (var other in _or) {
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var sql = other.compile();
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if (sql.isNotEmpty) b.write(' OR $sql');
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}
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return b.toString();
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}
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}
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