Python writes an interface to link to the mysql database to query data

1. First, use python to query the mysql database code as follows:

import MySQLdb

def getcontent():
    db = MySQLdb.connect('localhost', 'root', '1qaz!QAZ', 'zlnewschema', charset='utf8')
    cursor = db.cursor()
    sql = 'select * from user;'
    cursor.execute(sql)
    usercontent = cursor.fetchall()
    print(usercontent)
    for row in usercontent:
        fname = row[0]
        femail = row[1]
        fpw = row[2]
        ftime = row[3]
        print('name=%s,email=%s,password=%s,createtime=%s' %(fname, femail, fpw,ftime))
    db.close()

if __name__ == '__main__':
    getcontent()

Change to the interface, using the Flask framework (you can compare and see what needs to be changed):

Post request (just replace get with get):

import MySQLdb
import json
import os
os.environ['NLS_LANG'] = 'SIMPLIFIED CHINESE_CHINA.UTF8'
from flask import Flask,request
# from flask_cors import *
app = Flask(__name__)


@app.route('/index1', methods=['POST'])
def getcontent():
    db = MySQLdb.connect('localhost', 'root', '1qaz!QAZ', 'zlnewschema', charset='utf8')
    cursor = db.cursor()
    sql = 'select * from user;'
    cursor.execute(sql)
    usercontent = cursor.fetchall()
    print(usercontent)
    userjson = []
    for row in usercontent:
        fname = row[0]
        femail = row[1]
        fpw = row[2]
        ftime = row[3]
        # print('name=%s,email=%s,password=%s,createtime=%s' %(fname, femail, fpw,ftime))
        user = 'name=%s,email=%s,password=%s,createtime=%s' %(fname, femail, fpw,ftime)
        userjson.append(user)
    db.close()
    return json.dumps(userjson, ensure_ascii=False, indent=4)


if __name__ == '__main__':
    # getcontent()
    app.run(host='0.0.0.0', port=5590)

The above implements a simple interface

But the above returns all the data, how to filter the data according to the conditions? For example, I want the piece of data whose name = Zhang Liang, and the operation is as follows.

The specific code is as follows:

import MySQLdb
import json
import os
os.environ['NLS_LANG'] = 'SIMPLIFIED CHINESE_CHINA.UTF8'
from flask import Flask,request
# from flask_cors import *
app = Flask(__name__)


@app.route('/index1', methods=['POST'])
def zlindex():
    inputData = request.json.get('username')
    userdata = getcontent(inputData)
    return userdata


def getcontent(inputData):
    db = MySQLdb.connect('localhost', 'root', '1qaz!QAZ', 'zlnewschema', charset='utf8')
    cursor = db.cursor()
    sql = "select * from user where username = '%s';" %(inputData)
    cursor.execute(sql)
    usercontent = cursor.fetchall()
    print(usercontent)
    userjson = []
    for row in usercontent:
        fname = row[0]
        femail = row[1]
        fpw = row[2]
        ftime = row[3]
        # print('name=%s,email=%s,password=%s,createtime=%s' %(fname, femail, fpw,ftime))
        user = 'name=%s,email=%s,password=%s,createtime=%s' %(fname, femail, fpw,ftime)
        userjson.append(user)
    db.close()
    return json.dumps(userjson, ensure_ascii=False, indent=4)


if __name__ == '__main__':
    # getcontent()
    app.run(host='0.0.0.0', port=5590)

Postman searches as follows:

At this time, I found that the return is only a string, but if you want a standardized json format, you need to modify the assignment method of the for loop:

import MySQLdb
import json
import os
os.environ['NLS_LANG'] = 'SIMPLIFIED CHINESE_CHINA.UTF8'
from flask import Flask,request
# from flask_cors import *
app = Flask(__name__)


@app.route('/index1', methods=['POST'])
# def zlindex():
#     inputData = request.json.get('username')
#     userdata = getcontent(inputData)
#     return userdata


def getcontent():
    db = MySQLdb.connect('localhost', 'root', '1qaz!QAZ', 'zlnewschema', charset='utf8')
    cursor = db.cursor()
    sql = "select * from user"
    # sql = "select * from user where username = '%s';" %(inputData)
    cursor.execute(sql)
    usercontent = cursor.fetchall()
    print(usercontent)
    userjson = []
    for row in usercontent:
        # fname = row[0]
        # femail = row[1]
        # fpw = row[2]
        # ftime = row[3]
        # print('name=%s,email=%s,password=%s,createtime=%s' %(fname, femail, fpw,ftime))
        user = {'name': row[0], 'email': row[1], 'password': row[2], 'createtime': row[3].strftime("%Y-%m-%d %H:%M:%S")}
        # print(user)
        userjson.append(user)
        # print(userjson)
    db.close()
    return json.dumps(userjson, ensure_ascii=False, indent=4)  # 返回一个字典格式


if __name__ == '__main__':
    # getcontent()
    app.run(host='0.0.0.0', port=5590)

During the process, I found that the interface request will report 500 to the server, and the server will report an error: TypeError: Object of type 'datetime' is not JSON serializable 

The reason I finally found out is that the extracted value has a date format, and it is no problem to output it as a string str, but the json format cannot be recognized, as long as the format is converted when assigning a value: 'createtime': row[3].strftime("%Y-%m-%d %H:%M:%S")}

The query results are as follows:

 

Detailed explanation of how to use Postman: https://blog.csdn.net/fxbin123/article/details/80428216

Flask Chinese documentation: http://docs.jinkan.org/docs/flask/

Related reference link: https://www.cnblogs.com/testcoffee/p/6295970.html

                            https://www.jianshu.com/p/657c9be12e00

                            https://www.cnblogs.com/crss/p/8529002.html
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Original link: https://blog.csdn.net/weixin_40547993/article/details/89632691