javascript - Sequelize Reuse Query 在另一个查询中

Question

我在另一个函数中有一个查询，我想在另一个查询的 WITH 子句中重用它。我尝试了类似下面的代码。
代码给出粗略的想法。

const reuseQuery = async (IdType, eventID) => {
    try {
        const sqlQuery = `SELECT *
        FROM TableA TA 
        WHERE TA.IdType = :IdType AND TA.eventID = :eventID`;
        const replacements = {IdType, eventID};
        const result = await this.sequelize.query(sqlQuery, {replacements, type: this.sequelize.QueryTypes.SELECT});
        return result;
    } catch (error) {
        console.log(error);
    }
};


const useReuseQuery = async () => {
    try {
        const sqlQuery = `WITH Query1 AS (${await reuseQuery(1, 1)}),
        Query2 AS (${await reuseQuery(2, 1)})
        Select q1.name AS Captain, q2.name AS Player
        FROM Query1 q1, Query2 q2
        WHERE q1.partnerID = q2.ID AND q2.partnerID = q1.ID`;

        const result = await this.sequelize.query(sqlQuery, {type: this.sequelize.QueryTypes.SELECT});
        return result;
    } catch(error) {
        
    }
};

当我尝试时，我收到错误

UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'query' of undefined

Answer 1

在第二个函数中，您将两个结果集连接到一个查询字符串中，这是行不通的。 AFAIK，这不会生成有效的 SQL。
最好将第一个 sqlQuery 两次连接到第二个 sqlQuery 中，大致如下:

const reusableSqlQuery = `SELECT *
    FROM TableA TA 
    WHERE TA.IdType = :IdType AND TA.eventID = :eventID`;

const useReuseQuery = async () => {
try {
    const sqlQuery = `WITH Query1 AS (` + reusableSqlQuery +`),
    Query2 AS (` + reusableSqlQuery +`)
    Select q1.name AS Captain, q2.name AS Player
    FROM Query1 q1, Query2 q2
    WHERE q1.partnerID = q2.ID AND q2.partnerID = q1.ID`;
    const replacements = {1,1,2,1};
    const result = await this.sequelize.query(sqlQuery, {replacements, type: this.sequelize.QueryTypes.SELECT});
    return result;
} catch(error) {
    
}

};