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How to use DataReader

How to use DataReader: 1. Establish a connection; 2. Create a DataReader object; 3. Read data; 4. Close the connection. This topic provides you with relevant articles, downloads, and course content for you to download and experience for free.

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time：2023-11-30 14:56:58

How to use DataReader How to use DataReader: 1. Establish a connection; 2. Create a DataReader object; 3. Read data; 4. Close the connection. DataReader is an object used to read data from a data source. It provides an efficient method to read large amounts of data, and can also perform operations such as sorting, filtering, and paging of data.

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How does mysql allow tables to establish connections? MySQL establishes connections between tables, which are divided into two types: 1. Inner join, the primary key and foreign key between tables are connected, and only the data with the same key value is obtained; 2. Outer join, four are combined by setting the foreign key. The data in the tables are connected.

mysql surface

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MySQL connection is disconnected, how to re-establish the connection? MySQL connection is disconnected, how to re-establish the connection? MySQL is a commonly used relational database management system used to store and manage data. However, sometimes the connection may be interrupted due to network failure, server issues, or some limitations of MySQL itself. When the connection is lost, it needs to be re-established to continue using the MySQL database. The process of re-establishing a MySQL connection is relatively simple. Here are some common methods: Check the network connection: First, make sure the network connection is normal. If you are connecting via LAN or

mysql connection disconnect Re-establish

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How to establish connection with navicat 10038 error This error is usually caused by the mysql service not being started. [win+R]->cmd->services.msc->Enter, open the service, find mysql, start it, go back to Navicat for MySQL and click on the existing connection. This time you can see that it can be opened normally.

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