How to fix TypeError: sqlDb is not a constructor
Question
I have REST app using pure node.js I have created an HTML server that listens on port 8080 for a GET request. IF the request endpoint is /employees, for example ( http://localhost:8080/employees ), the response should be a recordset of the employee table. When I make the GET request for ( http://localhost:8080/employees I am receiving the following error found is db.js: TypeError: sqlDb is not a constructor
I am stuck at this point and any help would be greatly appreciated.
Here is the js code:
db.js
const sqlDb = require('mssql/msnodesqlv8')
//const sqlDb = require('mssql')
var settings = require("../settings");
exports.executeSql = function (sql, callback) {
var conn = new sqlDb.ConnectionPool(settings.dbConfig);
conn.connect()
.then(function () {
var req = new sqlDb(conn);
req.query(sql)
.then(function (recordset) {
callback(recordset);
})
.catch(function (err) {
console.log(err);
callback(null, err);
});
})
.catch(function (err) {
console.log(err);
callback(null, err);
});
};
server.js
const sqlDb = require('mssql/msnodesqlv8')
var http = require("http");
var emp = require("../controllers/employees");
const settings = require("../settings");
http.createServer(function (req, resp) {
switch (req.method) {
case "GET":
if (req.url === "/") {
resp.end();
}
else if (req.url === "/employees") {
emp.getList(req, resp);
}
break;
case "POST":
break;
case "PUT":
break;
case "DELETE":
break;
default:
break;
}
}).listen(settings.webPort, function () {
console.log("Server Started Listening at: " + settings.webPort);
});
employees.js
var db = require("../core/db");
exports.getList = function (req, resp) {
db.executeSql("SELECT * FROM EMPLOYEE", function (data, err) {
if (err) {
resp.writeHead(500, "Internal Error Occured", { "Content-Type": "text/html" });
resp.write("<html><head><title>500</title></head><body500: Internal Error. Details: " + err + "></body></html>");
}
else {
resp.writeHead(200, {"Content-Type": "application/json"});
resp.write(JSON.stringify(data));
}
resp.end();
});
};
exports.get = function (req, resp, empno) {
};
exports.add = function (req, resp, reqBody) {
};
exports.update = function (req, resp, reqBody) {
};
exports.delete = function (req, resp, reqBody) {
};
settings.js
exports.dbConfig = {
user: 'sa',
password: '123abc',
server: 'localhost',
database: 'LWWEBAPP',
port: 1433
};
exports.webPort = 8080;
This is the console.log(sqlDb);
{ ConnectionPool: [Function: ConnectionPool],
Transaction: [Function: Transaction],
Request: [Function: Request],
PreparedStatement: [Function: PreparedStatement],
ConnectionError: [Function: ConnectionError],
TransactionError: [Function: TransactionError],
RequestError: [Function: RequestError],
PreparedStatementError: [Function: PreparedStatementError],
Table:
{ [Function: Table]
fromRecordset: [Function: fromRecordset],
parseName: [Function: parseName] },
ISOLATION_LEVEL:
{ READ_UNCOMMITTED: 1,
READ_COMMITTED: 2,
REPEATABLE_READ: 3,
SERIALIZABLE: 4,
SNAPSHOT: 5 },
TYPES:
{ VarChar: [sql.VarChar],
NVarChar: [sql.NVarChar],
Text: [sql.Text],
Int: [sql.Int],
BigInt: [sql.BigInt],
TinyInt: [sql.TinyInt],
SmallInt: [sql.SmallInt],
Bit: [sql.Bit],
Float: [sql.Float],
Numeric: [sql.Numeric],
Decimal: [sql.Decimal],
Real: [sql.Real],
Date: [sql.Date],
DateTime: [sql.DateTime],
DateTime2: [sql.DateTime2],
DateTimeOffset: [sql.DateTimeOffset],
SmallDateTime: [sql.SmallDateTime],
Time: [sql.Time],
UniqueIdentifier: [sql.UniqueIdentifier],
SmallMoney: [sql.SmallMoney],
Money: [sql.Money],
Binary: [sql.Binary],
VarBinary: [sql.VarBinary],
Image: [sql.Image],
Xml: [sql.Xml],
Char: [sql.Char],
NChar: [sql.NChar],
NText: [sql.NText],
TVP: [sql.TVP],
UDT: [sql.UDT],
Geography: [sql.Geography],
Geometry: [sql.Geometry],
Variant: [sql.Variant] },
MAX: 65535,
map:
[ { js: [Function: String], sql: [sql.NVarChar] },
{ js: [Function: Number], sql: [sql.Int] },
{ js: [Function: Boolean], sql: [sql.Bit] },
{ js: [Function: Date], sql: [sql.DateTime] },
{ js: [Object], sql: [sql.VarBinary] },
{ js: [Object], sql: [sql.TVP] },
register: [Function] ],
VarChar: [sql.VarChar],
VARCHAR: [sql.VarChar],
NVarChar: [sql.NVarChar],
NVARCHAR: [sql.NVarChar],
Text: [sql.Text],
TEXT: [sql.Text],
Int: [sql.Int],
INT: [sql.Int],
BigInt: [sql.BigInt],
BIGINT: [sql.BigInt],
TinyInt: [sql.TinyInt],
TINYINT: [sql.TinyInt],
SmallInt: [sql.SmallInt],
SMALLINT: [sql.SmallInt],
Bit: [sql.Bit],
BIT: [sql.Bit],
Float: [sql.Float],
FLOAT: [sql.Float],
Numeric: [sql.Numeric],
NUMERIC: [sql.Numeric],
Decimal: [sql.Decimal],
DECIMAL: [sql.Decimal],
Real: [sql.Real],
REAL: [sql.Real],
Date: [sql.Date],
DATE: [sql.Date],
DateTime: [sql.DateTime],
DATETIME: [sql.DateTime],
DateTime2: [sql.DateTime2],
DATETIME2: [sql.DateTime2],
DateTimeOffset: [sql.DateTimeOffset],
DATETIMEOFFSET: [sql.DateTimeOffset],
SmallDateTime: [sql.SmallDateTime],
SMALLDATETIME: [sql.SmallDateTime],
Time: [sql.Time],
TIME: [sql.Time],
UniqueIdentifier: [sql.UniqueIdentifier],
UNIQUEIDENTIFIER: [sql.UniqueIdentifier],
SmallMoney: [sql.SmallMoney],
SMALLMONEY: [sql.SmallMoney],
Money: [sql.Money],
MONEY: [sql.Money],
Binary: [sql.Binary],
BINARY: [sql.Binary],
VarBinary: [sql.VarBinary],
VARBINARY: [sql.VarBinary],
Image: [sql.Image],
IMAGE: [sql.Image],
Xml: [sql.Xml],
XML: [sql.Xml],
Char: [sql.Char],
CHAR: [sql.Char],
NChar: [sql.NChar],
NCHAR: [sql.NChar],
NText: [sql.NText],
NTEXT: [sql.NText],
TVP: [sql.TVP],
UDT: [sql.UDT],
Geography: [sql.Geography],
GEOGRAPHY: [sql.Geography],
Geometry: [sql.Geometry],
GEOMETRY: [sql.Geometry],
Variant: [sql.Variant],
VARIANT: [sql.Variant],
connect: [Function: connect],
close: [Function: close],
on: [Function: on],
off: [Function: removeListener],
removeListener: [Function: removeListener],
query: [Function: query],
batch: [Function: batch],
Promise: [Getter/Setter] }
1 answers
solution1
0 2017-04-15 21:20:13
I had a mistake in my code that was causing the problem. The line that reads var req = new sqlDb.(conn); should read var req = new sqlDb.Request(conn); This is the complete corrected db.js:
const sqlDb = require('mssql/msnodesqlv8')
var settings = require("../settings");
var server = require("./server");
exports.executeSql = function (sql, callback) {
var conn = new sqlDb.ConnectionPool(settings.dbConfig);
conn.connect()
.then(function () {
var req = new sqlDb.Request(conn);
req.query(sql)
.then(function (recordset) {
callback(recordset);
})
.catch(function (err) {
console.log(err);
callback(null, err);
});
})
.catch(function (err) {
console.log(err);
callback(null, err);
});
};
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.
Related Question
How to fix "TypeError: fsevents is not a constructor" react error
TypeError: sqlDb.Connection is not a constructor in Rest Service using Node.js
How to fix TypeError: application_module__WEBPACK_IMPORTED_MODULE_1___default.a is not a constructor
How to fix an Uncaught TypeError
How to fix 'Uncaught TypeError: tagsInput is not a constructor' error while initiating custom JavaScript plugin two times on the same page
How fix a TypeError?
How to fix this TypeError
How to fix “TypeError: _this is undefined”
How to fix Uncaught TypeError in JavaScript?
How to fix TypeError: registerUser is not a function
Related Tags