Wincc操作数据库SQLSERVER
WINCC写数据库
在WINCC的图形编辑器中,在输入域的属性中。选择事件。再选择键盘的释放动作,在动作代码框中写下例如以下代码:
Dim conn,rs
Dim strsql
Dim a
a=HMIRuntime.Tags("datavariable").Read
Set conn=CreateObject("adodb.connection")
Set rs=CreateObject("adodb.recordset")
conn.Provider = "sqloledb"
conn.open "SERVER=Yang-PC\WINCC;uid=sa;pwd=sa;database=datasavetest"
strsql="insert into tt_ch(TagValue)VALUES('" & a &"')"
Set rs=conn.execute(strsql)
conn.close
Set rs=Nothing
Set conn=Nothing
End If
如此,就可以实现WINCC的实时数据向SQL SERVER的数据写入。
WINCC读数据库
Dim conn,rs
Dim strsql
Dim temp1,temp2
Set conn=CreateObject("adodb.connection")
Set rs=CreateObject("adodb.recordset")
conn.Provider = "sqloledb"
conn.open "SERVER=YANG-PC\WINCC;uid=sa;pwd=1988525;database=datasavetest"
strsql="select * from table_1"
Set rs=conn.execute(strsql)
rs.movenext'读取数据集中的下一条还能够通过数据集的其它属性进行操作
temp1 = rs.Fields(0).Value '取第一列的值
'temp1 = rs("text")从数据集中取字段“text”的值
Set temp2 = HMIRuntime.Tags("textdataAuto")
temp2.Read
temp2.Write temp1
conn.close
Set rs = Nothing
Set conn=Nothing
假设我们须要连接的是access数据库,仅仅须要将
"SERVER=YANG-PC\WINCC;uid=sa;pwd=1988525;database=datasavetest"
替换为
"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=datasavetest"
更多相关教程请访问 MySQL视频教程

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



In MySQL database, the relationship between the user and the database is defined by permissions and tables. The user has a username and password to access the database. Permissions are granted through the GRANT command, while the table is created by the CREATE TABLE command. To establish a relationship between a user and a database, you need to create a database, create a user, and then grant permissions.

Data Integration Simplification: AmazonRDSMySQL and Redshift's zero ETL integration Efficient data integration is at the heart of a data-driven organization. Traditional ETL (extract, convert, load) processes are complex and time-consuming, especially when integrating databases (such as AmazonRDSMySQL) with data warehouses (such as Redshift). However, AWS provides zero ETL integration solutions that have completely changed this situation, providing a simplified, near-real-time solution for data migration from RDSMySQL to Redshift. This article will dive into RDSMySQL zero ETL integration with Redshift, explaining how it works and the advantages it brings to data engineers and developers.

To fill in the MySQL username and password: 1. Determine the username and password; 2. Connect to the database; 3. Use the username and password to execute queries and commands.

1. Use the correct index to speed up data retrieval by reducing the amount of data scanned select*frommployeeswherelast_name='smith'; if you look up a column of a table multiple times, create an index for that column. If you or your app needs data from multiple columns according to the criteria, create a composite index 2. Avoid select * only those required columns, if you select all unwanted columns, this will only consume more server memory and cause the server to slow down at high load or frequency times For example, your table contains columns such as created_at and updated_at and timestamps, and then avoid selecting * because they do not require inefficient query se

View the MySQL database with the following command: Connect to the server: mysql -u Username -p Password Run SHOW DATABASES; Command to get all existing databases Select database: USE database name; View table: SHOW TABLES; View table structure: DESCRIBE table name; View data: SELECT * FROM table name;

MySQL is suitable for beginners because it is simple to install, powerful and easy to manage data. 1. Simple installation and configuration, suitable for a variety of operating systems. 2. Support basic operations such as creating databases and tables, inserting, querying, updating and deleting data. 3. Provide advanced functions such as JOIN operations and subqueries. 4. Performance can be improved through indexing, query optimization and table partitioning. 5. Support backup, recovery and security measures to ensure data security and consistency.

MySQL database performance optimization guide In resource-intensive applications, MySQL database plays a crucial role and is responsible for managing massive transactions. However, as the scale of application expands, database performance bottlenecks often become a constraint. This article will explore a series of effective MySQL performance optimization strategies to ensure that your application remains efficient and responsive under high loads. We will combine actual cases to explain in-depth key technologies such as indexing, query optimization, database design and caching. 1. Database architecture design and optimized database architecture is the cornerstone of MySQL performance optimization. Here are some core principles: Selecting the right data type and selecting the smallest data type that meets the needs can not only save storage space, but also improve data processing speed.

Navicat itself does not store the database password, and can only retrieve the encrypted password. Solution: 1. Check the password manager; 2. Check Navicat's "Remember Password" function; 3. Reset the database password; 4. Contact the database administrator.
