How to connect to mysql database

Connecting to the MySQL database requires the following steps: Obtain connection information: server address, port, user name, password, database name. Choose a connection method: You can use a Python library (such as MySQLdb or pymysql) or the command line (such as MySQL). Perform queries and operations: After the connection is established, queries and update operations can be performed. Close connection: After the operation is completed, close the connection to release resources.

How to connect to MySQL database

Step one: Obtain connection information

• Server address: the IP address or host name of the database server
• Port: usually 3306
• Username: the username of the database user
• Password: Database user’s password
• Database name: Name of the database to be connected

Step 2: Select the connection method

• Use Python library (such as MySQLdb or pymysql):

  <code class="python">import mysql.connector
  
  # 创建连接对象
  conn = mysql.connector.connect(
    host="127.0.0.1",
    port=3306,
    user="username",
    password="password",
    database="database_name"
  )</code>

• Use command line (such as MySQL):

  <code class="shell">mysql -h 127.0.0.1 -P 3306 -u username -p password database_name</code>

Step 3: Perform queries and operations

Once the connection is established, you can perform queries and operations using:

• Execute query:

  <code class="python"># 创建游标对象
  cursor = conn.cursor()
  
  # 执行查询
  cursor.execute("SELECT * FROM table_name")
  
  # 获取结果
  rows = cursor.fetchall()
  
  # 关闭游标
  cursor.close()</code>

• Perform update operation:

  <code class="python">cursor.execute("UPDATE table_name SET field_name='new_value' WHERE condition")
  conn.commit()</code>

Step 4: Close the connection

After the operation is completed, please close the connection to release resources:

<code class="python">conn.close()</code>

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