Time needs to be enclosed with #, such as #.Strings need to be enclosed in single quotes, such as username= 'John'.The operation of the numeric type (whether integer or floating point) and the price data type, user can directly enter the number, such as id= 100.There are also different identifiers in the SQL statement: Note: Fields have different types, such as numbers, strings, time and place. It also enables convenient and quick use of various functions of SQL.Īn example vi of direct execution of SQL in LabVIEW. It avoids the disadvantages of advanced operation being unable to sort display and difficulty in executing a complex nested statement. The figure below shows direct execution of the SQL statement. LabVIEW's own database advanced operations are an encapsulation of SQL query - the core is to use SQL language to operate the database. The second method is to create a new text file, change the suffix name to.This method is recommended because the user does not have to manually create new files and change the suffix name. Select LabVIEW>Tool>Create Data Link to create a UDL and configure database location. The first method is to create the UDL in LabVIEW.There are two ways to create a new UDL file: The UDL file is the hub to connect LabVIEW and database. The same result can be obtained by writing the SQL statement in lowercase, but for the sake of clarity and legibility, the SQL keyword usually written in capital letters. For example, table and Table are the same table, and id and ID represent the same field. Note: Words in database operation are not case-sensitive. They are sorted in ascending order in the myid field and descending order in the mydate field. This statement selects the first 30 records (represent by *) in the mytable table where myprice is greater than 1000 and the myname field is not equal to somename. Select TOP 30 * FROM mytable WHERE > 1000 AND myname somename ORDER BY myid ASC, mydate DESC The first two categories are commonly used, such as creating a new table, query sorting, adding or deleting records.
It includes four parts: data definition, data operation, data control, and transaction control. Structured Query Language (SQL) is the standard language for manipulating databases.
Each row is a record, which represents a unit, maybe a person or a piece of goods. Each table has several fields (columns) representing a certain type of attributes such as ID, name and contact information. An Access database file contains several tables, which are collections of a type of data. The database organizes and stores data in a hierarchical structure. Basic concepts of database and terminology explanation
#Microsoft access database install
Note: User must install the 32 bit database engine or else error -2147467259 occurs.Ģ. The option Microsoft Office 12.0 Access Database Engine OLE DB Provider may be missing, and users may be unable to access. Most computers do not have the database engine installed by default, which can result in difficulties when creating a UDL file.
#Microsoft access database software
Make sure the development computer has both Microsoft Access and Microsoft Access database Engine installed - the necessary software can be found on Microsoft's site. Preparing the Microsoft Access Environment
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