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mysql數據庫的基本代碼

錢良釵2年前12瀏覽0評論

MySQL是一種流行的關系型數據庫,可以用來存儲和管理數據。在使用MySQL數據庫時,有一些基本的代碼需要掌握。

#連接到MySQL數據庫
import mysql.connector
mydb = mysql.connector.connect(
host="localhost",
user="username",
password="password",
database="database_name"
)
#創建表
mycursor = mydb.cursor()
mycursor.execute("CREATE TABLE customers (name VARCHAR(255), address VARCHAR(255))")
#插入數據
sql = "INSERT INTO customers (name, address) VALUES (%s, %s)"
val = ("John", "Highway 21")
mycursor.execute(sql, val)
mydb.commit()
print(mycursor.rowcount, "record inserted.")
#查詢數據
mycursor.execute("SELECT * FROM customers")
myresult = mycursor.fetchall()
for x in myresult:
print(x)
#更新數據
sql = "UPDATE customers SET address = 'Canyon 123' WHERE address = 'Highway 21'"
mycursor.execute(sql)
mydb.commit()
print(mycursor.rowcount, "record(s) affected")
#刪除數據
sql = "DELETE FROM customers WHERE address = 'Highway 21'"
mycursor.execute(sql)
mydb.commit()
print(mycursor.rowcount, "record(s) deleted")
#關閉連接
mydb.close()

通過掌握這些基本的MySQL代碼,您可以開始使用MySQL數據庫存儲和管理您的數據。