一个程序如何和数据库进行交互呢？首先，该程序要和数据库建立连接，然后，

How does a program interact with the database? First, the program establishes a connection with the database, then uses the database connection to obtain the database operation cursor, executes the SQL statement with the database operation cursor, interacts with the database, receives the return value (that is, the result of the interaction), and finally closes the database operation cursor, Close the database connection. However, exceptions are likely to occur during database operations, so some related exception handling operations during database use are required. If an exception occurs in the database operation, specific output is required to prompt the cause of the exception, and then these prompts can be used to resolve these exceptions, so an exception handling statement should be added to handle the exception where it may occur. After the execution of the exception handling statement is completed, there should be a finally code block to perform some fixed operations, such as closing the database operation cursor, closing the database connection, etc. <br>Through the API provided by MySQL for Python, you can perform various operations on the information in the database, such as creating a database, modifying database information, deleting a database, creating a table, modifying table information, deleting a table, inserting data into a table, and deleting data from a table and many more. When inserting data, if the stored data is a picture, you can store the picture in a binary way to the MySQL database. At the same time, the binary code stored in the database can also be read out and written to a file to generate a picture.<br>If you want Python to operate the MySQL database, you need to install the MySQL-python driver, which is an indispensable module for Python to operate MySQL. The driver contains the MySQLdb module, which is a module for Python to connect to the MySQL database. The basic steps for Python to use the MySQLdb module to operate the database include: (1) Introduce the MySQLdb library and import MySQLdb; (2) Connect to the database. The MySQLdb module provides a connect method to create a database connection. When creating a database connection, you need to pass in several to the connect method Parameters, more commonly used parameters include: host: database host name. The default is the local host, user: database login name. The default is the current user, passwd: database login secret. The default is empty, db: the database name to use. There is no default value, port: TCP port used by MySQL service, the default is 3306, charset: database encoding, (for example: conn = MySQLdb.connect (host = 'localhost', user = 'root', passwd = '520456', db = 'craw <br>lers', charset = 'utf8');) (3) Execute the SQL statement and receive the return value. First, we use the connection object to obtain a cursor object. Next, we will use the method provided by the cursor to work . (4) Close the cursor object and close the database connection. It also provides a try-catch statement similar to java to catch exceptions that may occur during database operations.

How does a program interact with the database? First, the program and the database to establish a connection, and then, using the database connection to obtain the database operation cursor, using the database operation cursor to execute SQL statements, interact with the database, receive the return value (i.e., the result of the interaction), and finally close the database operation cursor, close the database connection. However, exceptions are likely to occur during database operations, so some related exception handling operations during database usage are required. If an exception occurs in a database operation, a specific output is required to indicate why the exception occurred, and then these exceptions can be resolved with these prompt information, so an exception handling statement should be added where the exception may occur. Once the statement that handles the exception is executed, there should be a final ly code block to perform some fixed actions, such as closing the database operation cursor, closing the database connection, and so on.<br>The API provided by MySQL for Python allows various operations on the information in the database, such as creating a database, modifying database information, deleting the database, creating a table, modifying table information, deleting a table, inserting data into a table, deleting data from a table, and so on. Where the data is inserted, if the data stored is a picture, the picture can be stored in a binary way to the MySQL database, at the same time, stored into the database of binary code, can also be read out write file, generate pictures.<br>To enable Python to operate the MySQL database, you need to install the MySQL-python driver, which is an essential module for Python to operate MySQL. The driver includes the MySQLdb module, which is a Python-connected Module for the MySQL database. The basic steps for Python to operate the database using the MySQLdb module include: (1) introducing the MySQLdb library, import MySQLdb, (2) connecting the database, (2) providing a connect method to create a database connection, and the need to pass several parameters into the connection method when creating a database connection connection, the more commonly used parameters include: host: database host name. Database login.default is the current user, passwd: the secret of database login. Default is empty, db: database name to be used. No default value, port: TCP port used by MySQL service, default is 3306, charset: database encoding, (e.g. conn?MySQLdb.",'s 'localhost', user's'root', passwd'520456' , db'craw<br>lers', charset s'utf8') ;) (3) executes the sql statement and receives the return value, first, we get a cursor object using the connection object, and then we use the method provided by cursor to do the work. (4) Close the cursor object and close the database connection. A java-like try-catch statement is also provided to catch exceptions that may occur during database operations.

How does a program interact with a database? First, the program needs to establish a connection with the database, then, use the database connection to obtain the database operation cursor, use the database operation cursor to execute the SQL statement, interact with the database, receive the return value (i.e. the result of the interaction), finally close the database operation cursor and close the database connection. However, exceptions are likely to occur in the process of database operation, so it is necessary to handle some related exceptions in the process of database use. If there is an exception in the database operation, you need to output a specific prompt for the cause of the exception, and then you can use these prompts to solve these exceptions, so you need to add exception handling statements to deal with the exception where the exception may occur. After the exception handling statement is executed, there should be a finally code block to perform some fixed operations, such as closing database operation cursor, closing database connection, etc.<br>The API provided by MySQL for Python can perform various operations on the information in the database, such as creating database, modifying database information, deleting database, creating table, modifying table information, deleting table, inserting data into table, deleting data from table, etc. When inserting data, if the stored data is pictures, the pictures can be stored in the MySQL database in a binary way. At the same time, the binary code stored in the database can also be read out and written into a file to generate pictures.<br>In order for Python to operate MySQL database, it needs to install MySQL Python driver, which is an essential module for Python to operate mysql. The driver includes MySQL DB module, which is a module for Python to connect mysql database. The basic steps for Python to use MySQL DB module to operate database include: (1) importing MySQL database and importing MySQL db; (2) connect to the database. The MySQL DB module provides the connect method to create a database connection. When creating a database connection, several parameters need to be passed into the connect method. Common parameters include: host: database host name. The default is local host, user: database login name. The default is the current user, passwd: database login secret. The default is empty, DB: to use There is no default value. Port: the TCP port used by MySQL service. The default value is 3306. Charset: the database code (for example: conn = MySQL dB. Connect (host = localhost, user = root, passwd = 520456, DB = crawl)<br>Lers', charset ='utf8 '); (3) execute the SQL statement and receive the return value. First, we use the connection object to get a cursor object. Next, we will use the method provided by the cursor to work. (4) Close the cursor object and close the database connection. At the same time, it also provides a try catch statement similar to Java to catch exceptions that may occur during database operation.<br>