python操作mysql數據庫的相關操作實例

# -- coding: utf-8 --

python operate mysql database
import MySQLdb
數據庫名稱
DATABASE_NAME = ''
host = 'localhost' or '172.0.0.1'
HOST = ''
端口號
PORT = ''
用戶名稱
USER_NAME = ''
數據庫密碼
PASSWORD = ''
數據庫編碼
CHAR_SET = ''
初始化參數
def init():
    global DATABASE_NAME
    DATABASE_NAME = 'test'
    global HOST
    HOST = 'localhost'
    global PORT
    PORT = '3306'
    global USER_NAME
    USER_NAME = 'root'
    global PASSWORD
    PASSWORD = 'root'
    global CHAR_SET
    CHAR_SET = 'utf8'
獲取數據庫連接
def get_conn():
    init()
    return MySQLdb.connect(host = HOST, user = USER_NAME, passwd = PASSWORD, db = DATABASE_NAME, charset = CHAR_SET)
獲取cursor
def get_cursor(conn):
    return conn.cursor()
關閉連接
def conn_close(conn):
    if conn != None:
        conn.close()
關閉cursor
def cursor_close(cursor):
    if cursor != None:
        cursor.close()
關閉所有
def close(cursor, conn):
    cursor_close(cursor)
    conn_close(conn)
創建表
def create_table():
    sql = '''
    CREATE TABLE student (
    id int(11) NOT NULL,
    name varchar(20) NOT NULL,
    age int(11) DEFAULT NULL,
    PRIMARY KEY (id),
    UNIQUE KEY name (name)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8
    '''
    conn = get_conn()
    cursor = get_cursor(conn)
    result = cursor.execute(sql)
    conn.commit()
    close(cursor, conn)
    return result
查詢表信息
def query_table(table_name):
    if table_name != '':
        sql = 'select * from ' + table_name
        conn = get_conn()
        cursor = get_cursor(conn)
        result = cursor.execute(sql)
        for row in cursor.fetchall():
            print(row)

        #for r in row:      #循環每一條數據
            #print(r)
    close(cursor, conn)
else:
    print('table name is empty!')


插入數據
def insert_table():
    sql = 'insert into student(id, name, age) values(%s, %s, %s)'
    params = ('1', 'Hongten_a', '21')
    conn = get_conn()
    cursor = get_cursor(conn)
    result = cursor.execute(sql, params)
    conn.commit()
    close(cursor, conn)
    return result
更新數據
def update_table():
    sql = 'update student set name = %s where id = 1'
    params = ('HONGTEN')
    conn = get_conn()
    cursor = get_cursor(conn)
    result = cursor.execute(sql, params)
    conn.commit()
    close(cursor, conn)
    return result
刪除數據
def delete_data():
    sql = 'delete from student where id = %s'
    params = ('1')
    conn = get_conn()
    cursor = get_cursor(conn)
    result = cursor.execute(sql, params)
    conn.commit()
    close(cursor, conn)
    return result
數據庫連接信息
def print_info():
    print('數據庫連接信息:' + DATABASE_NAME + HOST + PORT + USER_NAME + PASSWORD + CHAR_SET)
打印出數據庫中表情況
def show_databases():
    sql = 'show databases'
    conn = get_conn()
    cursor = get_cursor(conn)
    result = cursor.execute(sql)
    for row in cursor.fetchall():
        print(row)
數據庫中表情況
def show_tables():
    sql = 'show tables'
    conn = get_conn()
    cursor = get_cursor(conn)
    result = cursor.execute(sql)
    for row in cursor.fetchall():
        print(row)
def main():
    show_tables()

#創建表
result = create_table()
print(result)
#查詢表
query_table('student')
#插入數據
print(insert_table())
print('插入數據后....')
query_table('student')
#更新數據
print(update_table())
print('更新數據后....')
query_table('student')
#刪除數據
delete_data()
print('刪除數據后....')
query_table('student')
print_info()
#數據庫中表情況
show_tables()



if name == 'main':
    main()</pre>