7.3 Designing the Python GUI database

设计数据库，创建两个表（Books）存储书名与（Quotations）注释，主要是sql的使用

1. 创建数据库

create database databaseName default character set 'utf8';

2. 显示所有数据库

show databases;

3. 显示所有表

show tables;

4. 创建表如下

5. 显示表结构

desc tableName;（show columns from tableName;）

# -*- coding: utf-8 -*-
import GuiDBConfig as guiConf
import mysql.connector as mysql
# connect by unpacking dictionary credentials
conn = mysql.connect(**guiConf.dbConfig)

# create cursor
cursor = conn.cursor()
GUIDB = 'GuiDB'
try:
    # cursor.execute("CREATE DATABASE {} DEFAULT CHARACTER SET 'utf8'".format(GUIDB))
    # cursor.execute("show databases")

    # 显示数据库表，下面一句等同于下面两句分开执行  show tables from tables == user database , show tables 分开执行
    # cursor.execute("show tables from {}".format(GUIDB))
    # select DB
    cursor.execute("use {}".format(GUIDB))
    # create Table inside DB
    # cursor.execute("CREATE TABLE Books (       \
    #          Book_ID INT NOT NULL AUTO_INCREMENT, \
    #          Book_Title VARCHAR(25) NOT NULL,     \
    #          Book_Page INT NOT NULL,              \
    #          PRIMARY KEY (Book_ID)                \
    #        ) ENGINE=InnoDB")
    # cursor.execute("CREATE TABLE Quotations ( \
    #           Quote_ID INT,                     \
    #           Quotation VARCHAR(250),           \
    #           Books_Book_ID INT,                \
    #           FOREIGN KEY (Books_Book_ID)       \
    #               REFERENCES Books(Book_ID)     \
    #               ON DELETE CASCADE             \
    #       ) ENGINE=InnoDB")

    cursor.execute("SHOW TABLES")
    print(cursor.fetchall())
    cursor.execute("show columns from quotations")
    print(cursor.fetchall())
except mysql.Error as error:
    print("Failed to create DB: {}".format(error))
cursor.close()
conn.close()
print(conn)

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terminal 显示如下：

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