kind of done. there is a mssql ML session, but not relevant right now

2026-02-17 13:39:00 +00:00
parent 72176b2be0
commit c0237a4314
9 changed files with 295 additions and 18 deletions
@@ -0,0 +1,42 @@
+import pyodbc
+
+try:
+    connection = pyodbc.connect('DRIVER={ODBC Driver 17 for SQL Server};SERVER=.;DATABASE=SampleDB;Trusted_Connection=yes')
+    cursor = connection.cursor()
+
+    create_table="""
+    IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[tbl_customers_from_csv_bulk_insert]') AND type in (N'U'))
+    begin
+    create table [dbo].[tbl_customers_from_csv_bulk_insert](
+    id int not null,
+    code varchar(50) null,
+    first_name varchar(50) null,
+    last_name varchar(50) null,
+    )
+    end;
+    """
+    cursor.execute(create_table)
+    connection.commit()
+
+    bulk_insert_cmd="""
+    bulk insert tbl_customers_from_csv_bulk_insert
+    from 'C:\\Users\\bl.SEV\\repos\\python-mssql\\advanced-topics\\csv\\sample-csv-file-for-bulk-insert-demo.csv'
+    with 
+    (
+        fieldterminator = ';',
+        rowterminator = '\n'
+    );
+    """
+    cursor.execute(bulk_insert_cmd)
+    connection.commit()
+
+    cursor.close()
+    connection.close()
+
+except pyodbc.Error as ex:
+    print()
+    print("exception: ",ex)
+    cursor.close()
+    connection.close()
+    print()
+    exit()
@@ -0,0 +1,41 @@
+import subprocess
+import os
+
+sql_instance = "."
+sql_database = "master"
+folder_to_check = "./sql_scripts/"
+
+def run_ps_command(cmd):
+    # Build the PowerShell invocation list
+    command = [
+        "PowerShell",
+        "-ExecutionPolicy", "Unrestricted",
+        "-Command", cmd
+    ]
+
+    result = subprocess.run(
+        command,
+        capture_output=True,
+        text=True
+    )
+    return result
+
+for file in os.listdir(folder_to_check):
+    if file.endswith(".sql"):
+        full_path = os.path.join(folder_to_check, file)
+        print(f"executing .sql file: {full_path}")
+
+        sql_command = (
+            f"Invoke-Sqlcmd -ServerInstance {sql_instance} "
+            f"-Database {sql_database} -InputFile \"{full_path}\""
+        )
+
+        result = run_ps_command(sql_command)
+
+        if result.returncode != 0:
+            print("Error executing script:")
+            print(result.stderr.strip())
+        else:
+            if result.stdout:
+                print("Output:")
+                print(result.stdout.strip())
@@ -1,18 +1,33 @@
+import tkinter
 import pyodbc
-import csv

-try:
+sql_server_ver = "Not Available"
+
+root = tkinter.Tk()
+root.geometry("600x400")
+root.title("Sample Python GUI App")
+
+label_hello_world = tkinter.Label(root, text=str(sql_server_ver), fg="red")
+
+def sql_server_version():
+
+    try:
        connection = pyodbc.connect('DRIVER={ODBC Driver 17 for SQL Server};SERVER=.;DATABASE=SampleDB;Trusted_Connection=yes')
    
        cursor = connection.cursor()

+        cursor.execute("select @@VERSION as version")

-
+        while 1:
+            row = cursor.fetchone()
+            if not row:
+                break
+            sql_server_ver = row.version

        cursor.close()
        connection.close()

-except pyodbc.Error as ex:
+    except pyodbc.Error as ex:
        print()
        print("exception: ",ex)
        cursor.close()
@@ -20,4 +35,11 @@ except pyodbc.Error as ex:
        print()
        exit()
    
-print()
+    label_hello_world.config(text=str(sql_server_ver))
+    label_hello_world.pack()
+
+btn_sql_server_version = tkinter.Button(root, command=sql_server_version, text="Retrieve SQL Server Version")
+btn_sql_server_version.pack(side=tkinter.TOP, pady=50)
+
+
+root.mainloop()
@@ -0,0 +1,5 @@
+1;customer1;fistName1;lastName1
+2;customer2;fistName2;lastName2
+3;customer3;fistName3;lastName3
+4;customer4;fistName4;lastName4
+5;customer5;fistName5;lastName5
@@ -0,0 +1,23 @@
+/*
+ * Created for the online course on Udemy: "Working with Python® on Windows® and SQL Server® Databases"
+ *
+ * Course URL: 
+ * https://www.udemy.com/course/python-windows-sql-server
+ *
+ * Author/Instructor: Artemakis Artemiou
+ *
+ * Disclaimer: This SQL script which is part of the online course on Udemy "Working with Python® on Windows® 
+ * and SQL Server® Databasess", is intended to be used only for demo purposes. Do not 
+ * use it for Production systems as it is simplified for demo purposes.
+ */
+
+create database SampleDB2022_1a;
+go
+
+use SampleDB2022_1a;
+go
+
+create table tblSample1a(
+id int,
+code varchar(50));
+go
@@ -0,0 +1,27 @@
+/*
+ * Created for the online course on Udemy: "Working with Python® on Windows® and SQL Server® Databases"
+ *
+ * Course URL: 
+ * https://www.udemy.com/course/python-windows-sql-server
+ *
+ * Author/Instructor: Artemakis Artemiou
+ *
+ * Disclaimer: This SQL script which is part of the online course on Udemy "Working with Python® on Windows® 
+ * and SQL Server® Databasess", is intended to be used only for demo purposes. Do not 
+ * use it for Production systems as it is simplified for demo purposes.
+ */
+
+use SampleDB2022_1a;
+go
+
+insert into tblSample1a
+values (1,'test1'), (2,'test2');
+
+create table tblSample1b(
+id int,
+code varchar(50));
+go
+
+insert into tblSample1b
+values (1,'test1'), (2,'test2');
+go
@@ -0,0 +1,27 @@
+/*
+ * Created for the online course on Udemy: "Working with Python® on Windows® and SQL Server® Databases"
+ *
+ * Course URL: 
+ * https://www.udemy.com/course/python-windows-sql-server
+ *
+ * Author/Instructor: Artemakis Artemiou
+ *
+ * Disclaimer: This SQL script which is part of the online course on Udemy "Working with Python® on Windows® 
+ * and SQL Server® Databasess", is intended to be used only for demo purposes. Do not 
+ * use it for Production systems as it is simplified for demo purposes.
+ */
+ 
+create database SampleDB2022_1b;
+go
+
+use SampleDB2022_1b;
+go
+
+create table tblSample1a(
+id int,
+code varchar(50));
+
+create table tblSample1b(
+id int,
+code varchar(50));
+go
@@ -1 +1,4 @@
 pyodbc
+langchain
+langchain-mcp-adapters
+aiohttp
@@ -0,0 +1,87 @@
+------------------------------------------------------
+-- 1. Solutions to common issues
+------------------------------------------------------
+-- Resolving the "Divide by zero" error (by example)
+DECLARE @denominator INT
+SET @denominator = 0
+--SELECT 1 / 0
+SELECT 1 / ISNULL(NULLIF(@denominator, 0), 1)
+------------------------------------------------------
+--Handling the error “The conversion of a char data type to a datetime data 
+--type resulted in an out-of-range datetime value”
+--Change the default language to “us_english” for the given SQL Server login:
+USE [master];
+ALTER LOGIN "LOGIN_NAME" WITH DEFAULT_LANGUAGE = us_english;
+--Best practice: Always use the ISO date format in your data applications/T-SQL scripts: YYYY-MM-DD
+------------------------------------------------------
+--Handling the error “Database [Database_Name] cannot be upgraded because it is read-only 
+--or has read-only files”
+--Make sure that the user account on which the SQL Server instance database engine is 
+--running has full access to the database files.
+------------------------------------------------------
+-- 2. Basic String Functions
+------------------------------------------------------
+-- Returns @length characters from @expression starting from @start_index
+SELECT SUBSTRING(@expression, @start_index, @length)
+SELECT SUBSTRING('This is a Test', 1, 4)
+-- Finds the given @pattern in the @string and replaces it with the @replacement_string
+SELECT REPLACE(@string, @pattern, @replacement_string)
+SELECT REPLACE('This is a Test', 'Test', 'New Test')
+-- Returns the size of @string in terms of number of characters
+SELECT LEN(@string)
+SELECT LEN('This is a Test')
+-- Returns the first @num_chars characters of the @string counting from the left
+SELECT LEFT(@string, @num_chars)
+SELECT LEFT('This is a Test',4)
+-- Returns the first @num_chars characters of the @string counting from the right
+SELECT RIGHT(@string, @num_chars)
+SELECT RIGHT('This is a Test',4)
+-- Removes the leading blank spaces
+SELECT LTRIM(@expression)
+SELECT LTRIM(' This is a Test')
+-- Removes the trailing blank spaces
+SELECT RTRIM(@expression)
+SELECT RTRIM('This is a Test ')
+------------------------------------------------------
+-- 3. Performance-Related Tips
+------------------------------------------------------
+-- Avoiding locking when reading data (however, dirty reads are allowed)
+-- You need to take into consideration, possible dirty-read issues when using this approach
+SELECT [columnName]
+FROM [tableName] WITH (NOLOCK)
+------------------------------------------------------
+-- Rebuild a specific index with using parameters
+USE [DATABASE_NAME];
+ALTER INDEX [INDEX_NAME] ON [SCHEMA.TABLE]
+REBUILD WITH (FILLFACTOR=[FILL_FACTOR_VALUE_BETWEEN_0_100], ONLINE=[ON|OFF]);
+-- Rebuild all indexes in a table with using parameters
+USE [DATABASE_NAME];
+ALTER INDEX ALL ON [SCHEMA.TABLE]
+REBUILD WITH (FILLFACTOR=[FILL_FACTOR_VALUE_BETWEEN_0_100], ONLINE=[ON|OFF]);
+------------------------------------------------------
+-- Updating database tables without causing blocking
+-- You need to take into consideration, possible dirty-read issues when using this approach
+UPDATE [TABLE_NAME] WITH (READPAST)
+SET …
+WHERE …
+------------------------------------------------------
+-- 4. Maintenance-Related Tips
+------------------------------------------------------
+-- Truncating a data/log file
+USE [DBName];
+DBCC SHRINKFILE ([Data_Log_LogicalName],TRUNCATEONLY);
+-- Renaming a Windows login
+ALTER LOGIN "[Domain or Server Name]\[Windows Username]"
+WITH NAME="[New Domain or New Server Name]\[Windows Username]";
+-- Renaming a SQL Server login
+ALTER LOGIN "[SQL Server Login Name]"
+WITH NAME="[New SQL Server Login Name]";
+-- Creating Logins for orphaned SQL Server users
+USE [DBName];
+EXEC sp_change_users_login 'Auto_Fix', '[UserName]', NULL, '[Password]';
+-- Changing the Database Owner in a SQL Server Database (SQL Login)
+USE [DBName];
+EXEC sp_changedbowner '[SQL_Login_Name]';
+-- Changing the Database Owner in a SQL Server Database (Windows Login)
+USE [DBName];
+EXEC sp_changedbowner '[DomainNameUserName]'