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Version: 3.4

QuerySelectExpression 查询选择子句

1. 结构声明​

class QuerySelectExpression extends LogicItem {
    distinct: boolean = false;
    star: boolean = true;
    selectElements: Array<QueryAggregateExpression | QueryFieldExpression> = [];
}

2. 节点示例​

(1) 示例​

AST 如下：​

{
    "concept": "QuerySelectExpression",
    "distinct": false,
    "star": true,
    "selectElements": [
        {
            "concept": "QueryFieldExpression",
            "isDotStar": true,
            "entityAsName": "Product",
            "propertyName": "",
            "asName": ""
        }
    ]
}

(2) 示例​

AST 如下：​

{
    "concept": "QuerySelectExpression",
    "distinct": false,
    "star": true,
    "selectElements": [
        {
            "concept": "QueryFieldExpression",
            "isDotStar": true,
            "entityAsName": "OrderProduct",
            "propertyName": "",
            "asName": ""
        },
        {
            "concept": "QueryFieldExpression",
            "isDotStar": true,
            "entityAsName": "OrderForm",
            "propertyName": "",
            "asName": ""
        },
        {
            "concept": "QueryFieldExpression",
            "isDotStar": true,
            "entityAsName": "Product",
            "propertyName": "",
            "asName": ""
        },
        {
            "concept": "QueryAggregateExpression",
            "asName": "totalAmount",
            "aggregateName": "SUM",
            "aggregateParam": {
                "concept": "QueryFieldExpression",
                "isDotStar": false,
                "entityAsName": "OrderProduct",
                "propertyName": "amount",
                "asName": ""
            }
        }
    ]
}