How to do sequential query execution?

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I have such a request:

try {
    /* 1) */
    const dayReports = await DayReport.findAll(query);
    dayReports.forEach((dayReport, index) => {
        /* 2) */
        const findAllYear = DayReport.findAll({
            where: {
                [Op.and]: [
                    {
                        report_date: {
                            [Op.between]: [new Date(dayReport.dataValues.report_date).getFullYear() + '-01-01', dayReport.dataValues.report_date]
                        }
                    }
                ]
            }
        });
        /* 3) */
        var get_sinking_year = 0;
        for (var i = 0; i < findAllYear.length; i++) {
            get_sinking_year += findAllYear[i].dataValues.sinking_day
        } 
        /* 4) */
        console.log(get_sinking_year)
    })
} catch (e) {
    errorHandler(res, e);
}

And I need to execute the request in order, as the numbers in the comments are located (I.e 1,2,3,4.).

Instead, my request is executed in this order 1,3,4,2.

Try this. It first gathers all the findAllYear results (steps 2), then executes steps 3 and 4 for each result.

try {
    /* 1) */
    const dayReports = await DayReport.findAll(query);

    const allYearArraysPromises = [];
    dayReports.forEach((dayReport, index) => {
        /* 2) */
        const findAllYear = DayReport.findAll({
            where: {
                [Op.and]: [
                    {
                        report_date: {
                            [Op.between]: [new Date(dayReport.dataValues.report_date).getFullYear() + '-01-01', dayReport.dataValues.report_date]
                        }
                    }
                ]
            }
        });
        allYearArraysPromises.push(findAllYear);
    }
    const allYearArrays = await Promise.all(allYearArraysPromises);
    allYearArrays.forEach((findAllYear) => {
        /* 3) */
        var get_sinking_year = 0;
        for (var i = 0; i < findAllYear.length; i++) {
            get_sinking_year += findAllYear[i].dataValues.sinking_day
        } 
        /* 4) */
        console.log(get_sinking_year)
    });
} catch (e) {
    errorHandler(res, e);
}

It's a little different from Tilieth's answer. If you wish to add a 5th step in the future, it would work in the correct order, 12345. With Tilieth's answer, the order would be 12534.

I'm adding some test scripts to illustrate this.

Tilieth's:

async function tilieth() {
  const dayReports = await new Promise(resolve => resolve(['a', 'b', 'c']));
  console.log('Step 1 - Result:', dayReports);
  dayReports.forEach(async(dayReport, index) => {
    console.log('Step 2 for', dayReport);
    const findAllYear = await new Promise(resolve => {
      setTimeout(() => {
        resolve(dayReport);
      }, 500);
    });
    console.log('Steps 3 & 4 for', findAllYear);
  });
  console.log('Step 5');
}
tilieth();

SQL Server sequential query execution, so it will execute query by their order. You actually can only execute a single statement per batch with SQL Server Compact. Call a sequential procedure within a procedure. There are contexts in which I wouldn't use a separate call after the first procedure (stpFirst). Other than security, we can look at this from the view of parameters - if the requirement or parameters of the second procedure (stpSecond) involves action or data from the first (stpFirst) and no other outside parameters or manipulation of existing

You need to await the result of the query inside the loop. At the moment it's returning a promise and goes straight to the following code.

try const findAllYear = await DayReport.findAll

SQL statement sequential execution for multiple statments [duplicate], After the execution of Query 1 is finished then the update query will be executed. You can run debugger to see the sequential execution. Synchronous sequential execution is built into JavaScript and looks like this: function func { foo(); bar(); baz(); } Asynchronously, via Promises # To execute Promise-based functions sequentially, you need to chain function calls via then(), which is the Promise equivalent of the semicolon:

Try using await or promises for "DayReport.findAll()". Also use map instead of for loop.

Sequential Execution of SQL Server Stored Procedures, When we call multiple stored procedures sequentially, especially when the procedures may have different parameter calls, how can we do this� In a query that returns a sequence of values, the query variable itself never holds the query results and only stores the query commands. Execution of the query is deferred until the query variable is iterated over in a foreach or For Each loop. This is known as deferred execution; that is, query execution occurs some time after the query is constructed. This means that you can execute a query as frequently as you want to.

Sequential execution of queries in a transaction � Issue #307 � vitaly-t , I presume I'd have to use sequence . In that case, how do I pass data into the source function in order to construct the queries? Can you help me� Consider the SQL SELECT statement syntax: SELECT DISTINCT <TOP_specification> <select_list> FROM <left_table> <join_type> JOIN <right_table> ON <join_condition> WHERE <where_condition> GROUP BY <group_by_list> HAVING <having_condition> ORDER BY <order_by_list>. In SQL, the first clause that is processed is the FROM clause, while the SELECT clause, which appears first in an SQL query, is processed much later.

SQL Query Order of Execution, This article will take you through some best practices to get you started on optimizing your SQL query order. Defining SQL order of execution. The� Use this parameter to enable concurrent query execution and set the maximum number of query execution helpers for each report service or batch report service process. The default value is 0, meaning that the concurrent query execution disabled. Each query execution helper results in an additional data source connection.

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Comments
  • But I need to be used dayReports.forEach((dayReport, index) => {