Data saving into the one table of the Access database (Database Access cyclic) - configuration window

Description:

The window serves for setting the parameters for the data storage into the Access database. By this technology the data are stored into one table (in the database, in the *.mdb file) with the name specified in the "Table" configurator. The minimum and maximum size of the table is defined. If the current size of the table exceeds the maximum size, then so many oldest records are removed to decrease the size to the minimum size of the table. This walkthrough repeats all over again.
By the RunTime method it is possible to do backward writing for this type of setting the storage (it is possible to write the records with the older time than the time of the last written record).
Caution: Two different PmaTrendGroup objects cannot be set so that they store the data into one *.mdb file.
The name of the variable on the "Data" tab can be maximum 64 characters long (the length of column name in the Access table is limited). This storage type has a limitation: If there are multiple PmaTrendGroup objects used with this storage type in the application, then there can be 63 such objects in one application at the most.

Configurators:

Data source (ConnectionString)	The ADO ConnectionString (http://www.connectionstrings.com) contains all necessary parameters needed by the ADO Connection object for database connection via the selected ADO Provider. Macro expression can be used for input (it is evaluated after starting the application). This configurator must not contain an empty string. For example $.join("Provider=Microsoft.Jet.OLEDB.4.0;","Data Source=",$.path("data","trend/"),$.expr("pMe.GroupId"),".mdb;")
Additional parameters	Additional parameters for storing. Allows to define names and data types of system columns, database types based on the trended value data type. Available parameters are shown in the following example together with their preset values for selectaed saving type (plugin). These values may not be entered. Enter the values only if non-default are needed. Entries are in the KeyVal format, for example "coltimename:pm_time;colattrname:pm_attr;dbdt.pmtime:DATETIME;dbdt.pmattr:LONG;dbdt.f64:DOUBLE;dbdt.f32:SINGLE;dbdt.i32:LONG;dbdt.i16:SHORT;dbdt.u8:BYTE;dbdt.b:BIT;". Macro expression can be used for input (it is evaluated after starting the application). coltimename (optional) - Name of the column containing the record timestamp. Default "coltimename:pm_time;". colattrname (optional) - Name of the column containing the record attribute. Default "colattrname:pm_attr;". dbdt.pmtime (optional) - Database data type of the column containing record timestamp. Default "dbdt.pmtime:DATETIME;". dbdt.pmattr (optional) - Database data type of the column containing record attribute. Default "dbdt.pmattr:LONG;". dbdt.f64 (optional) - Database data type of the column for trended variable of the data type: Float64 (Double). This is used if the trended value does not have its database data type defined. Default "dbdt.f64:DOUBLE;". dbdt.f32 (optional) - Database data type of the column for trended variable of the data type: Float32 (Single). This is used if the trended value does not have its database data type defined. Default "dbdt.f32:SINGLE;". dbdt.i32 (optional) - Database data type of the column for trended variable of the data type: Int32 (Long). This is used if the trended value does not have its database data type defined. Default "dbdt.i32:LONG;". dbdt.i16 (optional) - Database data type of the column for trended variable of the data type: Int16 (Integer). This is used if the trended value does not have its database data type defined. Default "dbdt.i16:SHORT;". dbdt.u8 (optional) - Database data type of the column for trended variable of the data type: Uint8 (Byte). This is used if the trended value does not have its database data type defined. Default "dbdt.u8:BYTE;". dbdt.b (optional) - Database data type of the column for trended variable of the data type: Bool (Boolean). This is used if the trended value does not have its database data type defined. Default "dbdt.b:BIT;".
Table	Name of the table in the database into which the data are stored. Macro expression can be used for input (it is evaluated after starting the application). This configurator must not contain an empty string.
Minimum table size	Minimum size of the table specified by the records count. The number of records in the table never drops below this minimum limit.
Maximum table size	Maximum size of the table specified by the records count. The number of records in the table never exceeds this maximum limit. When exceeding this limit, such count of the oldest records is removed to decrease the number of records in the table to the minimum size of the table. The -1 value means that the maximum size of the table is not limited by the records count.
Minimum table size by time-span	Minimum size of the table specified by time-span. The time-span of records in the table never drops below this minimum limit.
Maximum table size by time-span	Maximum size of the table specified by time-span. The maximum time-span of all records in the table. When exceeding this limit, such count of the oldest records is removed to decrease the number of records in the table to the minimum size of the table. The -1 value means that the maximum size of the table is not limited by the time size.

Note:

If the writing operation of record to the database fails, then the PROMOTIC system will try to write the record two more times. If the writing operation of record fails because of network error (timeout), then the PROMOTIC system closes the connection and will try to connect and write the record during following writings (of the same or another record). If the connection is regained, then the writing of trend records continues automatically. If the network failure continues during a longer period of time, some records may be lost. The information regading writing errors on network failure will be written into the global errors of the INFO system.

Promotic

Data saving into the one table of the Access database (Database Access cyclic) - configuration window

Description:

Configurators:

Note:

See also: