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Mongodb uses the forEach and js custom functions to modify the 19th character of the specified column

2025-04-06 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Database >

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The following is the test:

Db.csq.insert ({alm:'11110000011111100011110111010110'})

Db.csq.insert ({alm:'01110000011111100011110111010110'})

Db.csq.insert ({alm:'11111111111111111111111111111111'})

Db.csq.find () .forEach (function (e) {

E.alm = e.alm.substr (0jue 19) +'0' + e.alm.substr (20jue 12)

Db.csq.save (e)

});

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