Python MySQL Create Table
Creating a Table
To create a table in MySQL, use the "CREATE TABLE" statement.
Make sure you define the name of the database when you create the connection
Example
create a datebase named "mydatabase":
import mysql.connector
mydb = mysql.connector.connect(
host="localhost",
user="yourusername",
passwd="yourpassword",
database="mydatabase"
)
mycursor = mydb.cursor()
mycursor.execute("CREATE TABLE customers (name VARCHAR(255),
address VARCHAR(255))")
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If the above code was executed with no errors, you have now successfully created a table.
Check if Table Exists
You can check if a database exist by listing all tables in your database by using the "SHOW TABLES" statement:
Example
Return a list of your system's databases:
import mysql.connector
mydb = mysql.connector.connect(
host="localhost",
user="yourusername",
passwd="yourpassword",
database="mydatabase"
)
mycursor = mydb.cursor()
mycursor.execute("SHOW TABLES")
for x in mycursor:
print(x)
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Primary Key
When creating a table, you should also create a column with a unique key for each record.
This can be done by defining a PRIMARY KEY.
We use the statement "INT AUTO_INCREMENT PRIMARY KEY" which will insert a unique number for each record. Starting at 1, and increased by one for each record.
Example
Create primary key when creating the table:
import mysql.connector
mydb = mysql.connector.connect(
host="localhost",
user="yourusername",
passwd="yourpassword",
database="mydatabase"
)
mycursor = mydb.cursor()
mycursor.execute(sql = "CREATE TABLE customers (id INT AUTO_INCREMENT
PRIMARY KEY, name VARCHAR(255),
address VARCHAR(255))")
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If the table already exists, use the ALTER TABLE keyword:
Example
Create primary key on an existing table:
import mysql.connector
mydb = mysql.connector.connect(
host="localhost",
user="yourusername",
passwd="yourpassword",
database="mydatabase"
)
mycursor = mydb.cursor()
mycursor.execute("ALTER TABLE customers ADD COLUMN id INT AUTO_INCREMENT
PRIMARY KEY")
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