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Re: Storing lists on SQL

  • To: mathgroup at smc.vnet.net
  • Subject: [mg106340] Re: Storing lists on SQL
  • From: Chris Degnen <degnen at cwgsy.net>
  • Date: Fri, 8 Jan 2010 06:29:08 -0500 (EST)
  • References: <hi1qbt$eka$1@smc.vnet.net> <hi6sv7$9u5$1@smc.vnet.net>

Thanks to all who replied.  SQLExpr was exactly what I was looking
for.  I found if I define a text field with data length greater than
65535 a 16 million character-length field is created, which should
certainly suffice if 65535 isn't enough.

E.g. with DatabaseLink connection established:


SQLCreateTable[conn, SQLTable["Testing"],
   {SQLColumn["Record", "DataTypeName" -> "INTEGER"],
   SQLColumn["Data", "DataTypeName" -> "TEXT",
    "DataLength" -> 65536]}];
(* check table definition *)
Print[SQLColumns[conn, "Testing"]];
data1 = {"Lots of data",
   aRule -> {91, 90, 93, 92}, {"A list", "Etc."}};
SQLInsert[conn, "Testing", {"Record", "Data"}, {1, SQLExpr[data1]}];
retreivedData = SQLSelect[conn, "Testing",
     {"Data"}, SQLColumn["Record"] == 1][[1, 1, 1]];
SQLDropTable[conn, "Testing"];
Print[retreivedData];


output:

{SQLColumn[{testing,Record},
DataTypeName->int,Nullable->1,DataLength->11],
SQLColumn[{testing,Data},
DataTypeName->mediumtext,Nullable->1,DataLength->16277215]}

{Lots of data,aRule->{91,90,93,92},{A list,Etc.}}


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