Maximum length of the SQL command
I created a MySQL database and a LabView 8.6 application that inserts data into the database using the SQL Toolbox. I have a problem very long character data insertion in a LONGTEXT field. I determined that the problem occurs when the SQL command is more than 1 048 574 characters or the length of a particular field exceeds 1 048 326 characters (cannot say who).
The error I get is "error-2147467259 occurred at NI_Database_API.lvlib:Conn Execute.vi. "Exception occurred in the Microsoft OLE DB provider for ODBC drivers: [MySQL] [ODBC 5.1 Driver] [mysqld - 5.1.35 - community] MySQL version disappeared in NI_Database_API.lvlib:Conn Execute.vi.
According to the MYSQL documentation, a LONGTEXT can 4294967295 characters, so length shouldn't be a problem. The documentation also indicates "the effective maximum length of LONGTEXT columns also depends on the maximum packet size that is configured in the client/server protocol and available memory", but I don't know how to configure the packet size in LabView.
I enclose the code example that reproduces the problem, although it is based on a special run table structure effectively. The table definition is included on the diagram.
This setting must be configured outside of LabVIEW (UDL or DSN).
You must configure the server and the client:
I found this link while searching on stackoverflow
http://dev.MySQL.com/doc/refman/5.1/en/packet-too-large.html
You may need to select/Configure a specific vendor (different) in order to set this variable.
Tags: NI Software
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