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Incomplete large json string from SQL DB

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Pete sherer
Pete sherer 2024-3-24
回答： Abhaya 2024-8-16
Hi,
I have a large json string stored in SQL DB. table in SQL has 2 fields [ ID BIGINT, jsonFld NVARCHAR(MAX)]
If i used below command, I only get partial string back from SQL.
tSQL='SELECT ID, jsonFld FROM DBtable WHERE ID=1';
ttxt = connDB.fetch( tSQL);
If I used below, I can retrieve more text but still not complete.
tSQL='SELECT ID, jsonFld= CAST( jsonFld AS TEXT) FROM DBtable WHERE ID=1';
ttxt = connDB.fetch( tSQL); % The length( ttxt.jsonFld) is 9999999.
any suggestion on what I can do to receive full NVARCHAR(MAX) string back from SQL?
Thanks,

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回答（1 个）

Abhaya
Abhaya 2024-8-16
Follow the steps given below, to retrieve full string of the field named ‘jsonfid’ with ‘NVARCHAR(MAX)’ datatype from a SQL db.
  • Change the driver of the MATLAB 'Database toolbox' to JDBC driver, from ODBC driver.
  • Change the datatype of the field ‘jsonfid’ in ‘SQL’ table from ‘NVARCHAR(MAX)’ to ‘TEXT’.
You can refer to the following MATLAB Answers community question for further explanation.
https://www.mathworks.com/matlabcentral/answers/587489-sql-select-not-returning-full-string-from-query
Hope this helps.

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