OPC to MySQL: Writing OPC to the MySQL database

Configuring how to write OPC data to a MySQL database is similar to configuring how to write data to MSSQL. Only the main differences are described in this manual.

1. Download and install the 32-bit version of MySQL ODBC Connector (the ODBC driver) for MySQL from mysql.org.

2. The structure of a table in the database will look like this:

2.1 In the case of writing a lot of OPC items

CREATE TABLE opc_data (
  REC_ID int(11) NOT NULL AUTO_INCREMENT,
  TIMESTAMP datetime DEFAULT NULL,
  ITEM_NAME varchar(25) NOT NULL,
  ITEM_VALUE varchar(255) DEFAULT NULL,
PRIMARY KEY (REC_ID)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

2.2 In case of writing several OPC items

CREATE TABLE opc_data_2 (
  REC_ID int(11) NOT NULL AUTO_INCREMENT,
  TIMESTAMP datetime NOT NULL,
  ITEM1 varchar(30) DEFAULT NULL,
  ITEM2 varchar(30) DEFAULT NULL,
  PRIMARY KEY (REC_ID)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

If you specify any other data type than String for ITEM1 or ITEM2 in the OPC settings, you should create the columns of the corresponding types while creating a table.

3. Create an ODBC data source for your MySQL database.

4. During "Binding", you should take into account that the names of the table and its columns are case-sensitive in MySQL.

Related articles: OPC to MySQL: Writing OPC to the MySQL database

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