The mysql5.6 database , Database table the fields in a table are blob Type of json String data . It is involved in the performance pressure test json The efficiency of string processing is relatively low , The developers mentioned mysql5.7 After version json String provides the original ecology of json Handle . Record and learn here .

MySQL 5.7 Native JSON Format support

MySQL 5.7.7 labs Version start InnoDB The storage engine has native support JSON Format , The format is not simple BLOB A similar replacement . Native JSON Format support has the following advantages :

  • JSON Data validity check :BLOB Type cannot do such constraint checking at the database level
  • Query performance improvement : Queries don't need to traverse all strings to find data
  • Support the index : Through the function of virtual column, you can set JSON Part of the data in is indexed

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