Node.js MySQL UPDATE Table Query - Examples - Tutorial Kart
Node.js MySQL UPDATE Table Query ? Examples
Node.js MySQL UPDATE Table Query
You can update records of a table using MySQL UPDATE Query.
MySQL Update record(s) of a table
MySQL Update all records of a table
Node.js MySQL Update record(s) of a table
Consider the case that due to manual error, records in the students table are inserted with marks as 74 instead of 84. Now we shall execute a MySQL Update Query that updatesmarks column with value 84 where there is a value of 74.
UpdateRecordsFiltered.js - Update records of MySQL Table
// include mysql module var mysql = require('mysql');
//// cinrecalutdeeamcyosnqnlemcotidounle variable with the rveaqruimreydsqdle=tarielsquire('mysql'); var con = mysql.c reat eConnec t io n/(/{create a connection variable with the required details ipvhaaordscdto:ren"slo=scomaflyhssoeqsrlt.v"ce,rre//at eConnec t ion({ runhnoisntg: m"loycsaqllhost", // ip address of server running mysql
user: "arjun", // user naumseert:o"ayrojuunr"m, y//squlser name to your mysql database daptaasbsawseord: "password", // corresponding password
password: "padsastwaboardse",: /"/studentsDB" // use the specified database c}o)r;responding password
database: "studentsDB" // use t/h/emsapkeecitfoiedcodnanteacbtaiosen to the database. }c)o;n.connect(function(err) {
//ifm(aekrer)ttohcroownneercr;tion to/t/hief cdoantnaebcatsieo.n is successful c on.c onnec t (func t ion( errc)o{n.query("UPDATE students SET marks=84 WHERE marks=74", function (err, result, fields) {
i/f/(/ie/f rcirf)oantnhnyreocewtrirooenrrriw;shile executing above query, throw error succife(sesrfru)lthrow err;
c on.query("UPDAT E stud/e/ niftsthSeErTe is no error, you have the result marckso=n8so4leW.lHogE(RrEesult); marks=74", function (e}rr),;result, fields) { e}/x/)e;icfuatninygearrboorvwe hqilueery, throw error
if (err) throw err; // if there is no error,
yoRuuhnavtheethaeborevseulpt rogram in Terminal
c onsole.log(result ); Term})in;al Output
});
arjun@arjunVPCEH26EN:~/workspa ce/nodejs$ node Updat eRec ordsFilt ered. jasrjun@arjun-VPCEH26EN:~/workspace/nodejs$ node UpdateRecordsFiltered.js OkPacket { OfkiePladcCkoeutnt{: 0,
affiefeldcCtoeudnRto:w0s,: 3, insertId: 0, saefrfveecrtSetdaRtouws:s:343, wminaesrsensriatnIggdeC::o0u'(,nRto:w0s, mastecrhvedrS:t3atuCsh:a3n4g,ed: 3 Warnings: 0', pwroatroncinogl4C1o:untrtu:e0,, cmheasnsgaegdeR:o'w(Rso:w3s}matched: 3 Changed: 3 Warnings: 0',
protocol41: true,
changedRows: 3 }
Node.js MySQL Update all records of a table
Consider a scenario where the exam conducted to the students is cancelled due to some reason, you want to
reconduct the exam. So, you would like to update the marks for all the students to 0. Following Node.js MySQL
UPDATE Query Example shows how to update all the records of a table.
UpdateRecordsAll.js - Update All Records in a Table
// include mysql module var mysql = require('mysql');
//// cinrecalutdeeamcyosnqnlemcotidounle variable with the rveaqruimreydsqdle=tarielsquire('mysql'); var con = mysql.c reat eConnec t io n/(/{create a connection variable with the required details ipvhaaordscdto:ren"slo=scomaflyhssoeqsrlt.v"ce,rre//at eConnec t ion({ runhnoisntg: m"loycsaqllhost", // ip address of server running mysql
user: "arjun", // user naumseert:o"ayrojuunr"m, y//squlser name to your mysql database daptaasbsawseord: "password", // corresponding password
password: "padsastwaboardse",: /"/studentsDB" // use the specified database c}o)r;responding password
database: "studentsDB" // use t/h/emsapkeecitfoiedcodnanteacbtaiosen to the database. }c)o;n.connect(function(err) {
//ifm(aekrer)ttohcroownneercr;tion to/t/hief cdoantnaebcatsieo.n is successful c on.c onnec t (func t ion( errc)o{n.query("UPDATE students SET marks=84", function (err, result, fields) {
i/f/(/ie/f rcirf)oantnhnyreocewtrirooenrrriw;shile executing above query, throw error succife(sesrfru)lthrow err;
c on.query("UPDAT E stud/e/ niftsthSeErTe is no error, you have the result marckso=n8so4l"e,.flougn(crteiosunlt); (err, result, fields) { //})if; any error while et}hx)re;ocwuteinrgroar bove query,
if (err) throw err; // if there is no error,
Observe that there is no W HERE clause in the Query because of which all the records are selected for update process.
Conclusion :
In this Node.js Tutorial ? Node.js MySQL ? UPDATE Table Query, we have learnt to UPDATE records based on a condition or UPDATE all the records of a table.
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