Question

当我写这样的参数时有什么区别？我相信底部proc表示将默认值设置为null。顶部给了我一个错误：

关键字＆＃39; NULL＆＃39;附近的语法不正确。必须声明标量变量

CREATE PROCEDURE [dbo].[Create_Part]
    @AssessmentPartId UNIQUEIDENTIFIER OUTPUT,
    @assessmentPartCode VARCHAR(4) NULL,
    @assessmentPartCode VARCHAR(4) NULL
AS
    SET @AssessmentPartId = NEWID()
    INSERT INTO dbo.tblEMISAssessmentPart (AssessmentPartId, 
AssessmentPartcode, AssessmentPartCode)
    VALUES (@AssessmentPartId, @assessmentPartCode, 
@assessmentPartCode)
GO

vs

CREATE PROCEDURE [dbo].[Create_Part]
    @AssessmentPartId UNIQUEIDENTIFIER OUTPUT,
    @assessmentPartCode VARCHAR(4) = NULL,
    @assessmentPartCode VARCHAR(4) = NULL
AS
    SET @AssessmentPartId = NEWID()
    INSERT INTO dbo.tblEMISAssessmentPart (AssessmentPartId, 
AssessmentPartcode, AssessmentPartCode)
    VALUES (@AssessmentPartId, @assessmentPartCode, 
@assessmentPartCode)
GO

Answer 1

您无法更改TSQL存储过程参数的可为空性。它们总是可以为空。这就是第一位似乎正在做的事情。

您可以为存储过程参数指定默认值，这使它们成为可选参数。这就是第二位正在做的事情。

可以使用一个参数调用第二个过程，例如

module.exports = async function () {
    try {
       await load();

    } catch (ex) {
        console.log(ex);
        logger.error(ex);
    }
};

async function load() {
    return await new Promise((resolve, reject) => {
        TableImport.findAll().then((tables) => {
           for (let table of tables) {
                await loadData(table.fileName, table.tableName);
            }
            resolve();
        }).catch(function (err) {
            reject(err);
        })
    })
};


async function loadData(location, tableName) {
    return await new Promise(function (resolve, reject) {
        var currentFile = path.resolve(__dirname + '/../fdb/' + location);

        sequelize.query("LOAD DATA LOCAL INFILE '" + currentFile.replace('/', '//').replace(/\\/g, '\\\\') + "' INTO TABLE " + tableName + " FIELDS TERMINATED BY '|'").then(function () {
            resolve(tableName);
        }).catch(function (ex) {
            reject();
        });
    });
};

sql存储proc语法

1 个答案: