SQL Server 2022 : Python から利用する2023/11/30

	Python からの SQL Server 利用例です。
[1]	Python 3 インストール済みを前提として例示します。追加で Python DB API for ODBC をインストールしておきます。

[root@dlp ~]#

dnf -y install python3-pyodbc

[2]	テスト用のデータベース接続用ユーザーとデータベースを作成しておきます。

[root@dlp ~]#

sqlcmd -S localhost -U SA

Password:

# ログインユーザー作成
1> create login centos with PASSWORD= N'P@ssw0rd01';
2> go

# [SampleDB3] 作成
1> create database SampleDB3;
2> go

1> use SampleDB3;
2> go
Changed database context to 'SampleDB'.

# ログインユーザー [centos] と関連付けて DB ユーザー作成
1> create user centos for login centos;
2> go

# [centos] に DB オーナーロール付与
1> exec sp_addrolemember 'db_owner', 'centos';
2> go

# テストテーブル作成
1> create table SampleTable (
2> ID int identity(1,1) not null primary key, First_Name NVARCHAR(50), Last_Name NVARCHAR(50) );
3> insert into SampleTable (
4> First_Name, Last_Name) values (N'CentOS', N'Linux'), (N'Debian', N'Linux'), (N'RedHat', N'Linux' );
5> go

[3]	基本的な利用例です。データベースや接続ユーザーは上記で作成したものを使用します。

# ODBC Driver 確認

[centos@dlp ~]$

odbcinst -j

unixODBC 2.3.11
DRIVERS............: /etc/odbcinst.ini
SYSTEM DATA SOURCES: /etc/odbc.ini
FILE DATA SOURCES..: /etc/ODBCDataSources
USER DATA SOURCES..: /home/centos/.odbc.ini
SQLULEN Size.......: 8
SQLLEN Size........: 8
SQLSETPOSIROW Size.: 8

[centos@dlp ~]$

cat /etc/odbcinst.ini

[ODBC Driver 17 for SQL Server]
Description=Microsoft ODBC Driver 17 for SQL Server
Driver=/opt/microsoft/msodbcsql17/lib64/libmsodbcsql-17.10.so.5.1
UsageCount=1

[centos@dlp ~]$

vi use_mssql.py

import pyodbc

server = '127.0.0.1'
database = 'SampleDB3'
username = 'centos'
password = 'P@ssw0rd01'
cnxn = pyodbc.connect('DRIVER={ODBC Driver 17 for SQL Server}; \
    SERVER='+server+'; PORT=1443; DATABASE='+database+'; UID='+username+'; PWD='+ password)
cursor = cnxn.cursor()

# SampleTable を Select
print ('\nReading data from SampleTable')
tsql = "select * from SampleTable;"
with cursor.execute(tsql):
    row = cursor.fetchone()
    while row:
        print (str(row[0]) + " " + str(row[1]) + " " + str(row[2]))
        row = cursor.fetchone()

# SampleTable に Insert
print ('\nInserting a new row into SampleTable')
tsql = "insert into SampleTable (First_Name, Last_Name) values (?,?);"
with cursor.execute(tsql,'Windows','Microsoft'):
    print ('- Successfuly Inserted!')

# 特定の行を Update
print ('\nUpdating Last_Name for Redhat')
tsql = "update SampleTable set Last_Name = ? where First_Name = ?"
with cursor.execute(tsql,'Plow','Redhat'):
    print ('- Successfuly Updated!')

tsql = "select * from SampleTable;"
with cursor.execute(tsql):
    row = cursor.fetchone()
    while row:
        print (str(row[0]) + " " + str(row[1]) + " " + str(row[2]))
        row = cursor.fetchone()

# 特定の行を Delete
print ('\nDeleting user Debian')
tsql = "delete from SampleTable where First_Name = ?"
with cursor.execute(tsql,'Debian'):
    print ('- Successfuly Deleted!')

[centos@dlp ~]$

python3 use_mssql.py


Reading data from SampleTable
1 CentOS Linux
2 Debian Linux
3 RedHat Linux

Inserting a new row into SampleTable
- Successfuly Inserted!

Updating Last_Name for Redhat
- Successfuly Updated!
1 CentOS Linux
2 Debian Linux
3 RedHat Plow
4 Windows Microsoft

Deleting user Debian
- Successfuly Deleted!