Question

我使用了节点j来连接mssql数据库服务器

我们正面临连接池释放异常。

找到代码段并在下面发布

代码：

var sql = require('mssql')
var dbconfig = {
    server: 'xxxx',
    database: 'xxxx',
    user: 'xxx',
    password: 'xxx',
    port: 'xx'
};
try {
    sql.close();
    var connection = sql.connect(dbconfig, function (err) {

        if (err) console.log(err);

        var sqlquery = '';
        var request = new sql.Request();
        //query to the database and get the repo value
        sqlquery = 'select Repo from verylargetable';
        request.query(sqlquery, function (err, result) {
            if (err) console.log(err)
            var repo = result.recordset[0].Repo;

            //query to the database and get the commit value
            sqlquery = "select Commit from verylargetable where Repo='" + repo + "'";
            request.query(sqlquery, function (err, result) {
                if (err) console.log(err)
                var comm = result.recordset[0].Commit;

                //query to the database and update the table
                sqlquery = "UPDATE verylargetable set Repo='" + repo + "', WHERE Comm='" + comm + "'";
                request.query(sqlquery, function (err, result) {
                    if (err) console.log(err)
                    console.log("record(s) updated");
                });
            });
        });
    });
}
catch (e) {
    console.log("===========Exception Occurred==========");
    console.log(e);
    console.log(new Date().toString());
    console.log("==========================================================");
}

问题：

TypeError：无法读取null的属性'release' 在ConnectionPool.release（/usr/lib/Webhook/node_modules/mssql/lib/base.js:199:14）在Request.userCallback（/usr/lib/Webhook/node_modules/mssql/lib/tedious.js:608:25）在Request._this.callback（/usr/lib/Webhook/node_modules/tedious/lib/request.js:47:27）在Connection.message（/usr/lib/Webhook/node_modules/tedious/lib/connection.js:1401:27）在Connection.dispatchEvent（/usr/lib/Webhook/node_modules/tedious/lib/connection.js:687:45）在MessageIO。（/usr/lib/Webhook/node_modules/tedious/lib/connection.js:602:18）在emitNone（events.js：67：13）在MessageIO.emit（events.js：166：7）在ReadablePacketStream。（/usr/lib/EJ2Webhook/node_modules/tedious/lib/message-io.js:102:16）在emitOne（events.js：77：13）在ReadablePacketStream.emit（events.js：169：7）

如何解决此异常以及如何在查询执行中处理异常？

Answer 1

尝试按照：

        request = new sql.Request();
        sqlquery = "select Commit from verylargetable where Repo='" + repo + "'";
        request.query(sqlquery, function (err, result) {

所以在每次行动之前都要获得新请求。

ConnectionPool.release节点js

1 个答案: