Vb how to connect mysql_vb how to connect to the database collection "advice"

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How to connect vbDatabaseLibrary[edit]

Overview

When we operate the database, on the one hand, we must enable users to access the required data on the program interface; on the other hand, we can perform various operations on the data in the database, and the final operation results must be fed back to the user.

One, Data control

1. Set the properties of the data control

2. Connect the Data control to a specific database and one of its tables

3. Create a standard project in VB

4. Add a control to the form (Data1 is a Data control)

5. Change some properties of the control

6. Set the Data control (to set the Databasename property in the Data control, when this property is set, a pair will pop up

In the dialog box, you can select the path of the database. There may be many tables in a database. We also need to specify a table, which can be passed through the Data control

Recordsource property to set)

7. Run the program

Second, ADO controls

ADO is an interface to the OLE database.It was introduced in VB6, it is a new data access technology from Microsoft, it is not easy to store in any format

Provide access to any data.ADO supports access to relational and non-relational databases, as well as other data sources.

1. Settings for connecting to the database

2. Specify a custom connection string to connect to the data source

3. Define a connection string to the data source

Three, connection method

(1) Using text files

1. Read the file

2. Formatting data

3. Close the file

4. Use data

5. If the amount of data is large and needs to be filtered, and the source file storing the data may change from time to time, then we can use a temporary file to store useful data

This can greatly improve the efficiency of the program

(2) The use of the database

1. Open the database

2. Find data

3. Use data

4. Close the database

(3) Reference a class that contains access to the database

1. Adopt ADODB

2. Compared with DAO and the API that can access the database, it is more flexible and powerful than DAO

3. Compared with API, it is easier to use and more suitable for beginners

4. Access is selected

(4) Database programming

1. Quote ADO

2. Create an object in the program

3. Open the database

4. Compare the password entered by the user to see if the login is allowed

5. Query records

6. Locate/filter information

7. Add/modify records

References:

Extended reading:

Related terms:

Database

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