dbcli-view

name	dbcli-view
description	Manage database views (CREATE/ALTER/DROP VIEW operations)
license	MIT
compatibility	Requires DbCli CLI tool (based on .NET 10 and SqlSugar). Supports Windows, Linux, macOS.
metadata	{"tool":"dbcli","version":"1.0.0","category":"database","supported-databases":"30+","safety-level":"moderate","requires-backup":"recommended","tags":["dbcli","sql","views","ddl","database"],"repository":"https://github.com/your-repo/dbcli"}
allowed-tools	dbcli

DbCli View Management Skill

Command Style (Use PATH)

All examples use the plain command name dbcli (no directory prefix). Ensure dbcli is on PATH instead of hardcoding paths like .\.claude\skills\dbcli\dbcli.exe.

Overview

Manage database views using DbCli's DDL command. This skill covers creating, altering, and dropping views across 30+ database systems.

Safety Level: Moderate
Requires Backup: Recommended before DROP operations

Quick Start

export DBCLI_CONNECTION="Data Source=app.db"

# Create a new view
dbcli ddl "CREATE VIEW ActiveUsers AS SELECT * FROM Users WHERE status='active'"

# Drop a view
dbcli ddl "DROP VIEW OldReport"

# List all views (database-specific queries)
dbcli query "SELECT name FROM sqlite_master WHERE type='view'"

---

Command Syntax

# Set environment variables first:
# export DBCLI_CONNECTION="connection-string"
# export DBCLI_DBTYPE="database-type"

dbcli ddl "<VIEW_DDL_STATEMENT>"

Options

| Option | Alias | Description | Example | |--------|-------|-------------|---------|| | Environment | | Database connection string | export DBCLI_CONNECTION="Server=localhost;Database=mydb" | | Environment | | Database type | export DBCLI_DBTYPE="sqlserver" | | --db-type | -t | Database type | -t sqlserver, -t mysql | | --format | -f | Output format | -f json, -f table | | --file | -F | Read SQL from file | -F create_view.sql | | --config | | Use config file | --config <path> |

---

Core Operations

1. Create View

SQLite

export DBCLI_CONNECTION="Data Source=app.db"

dbcli ddl "
CREATE VIEW IF NOT EXISTS ActiveUsers AS 
SELECT id, name, email, created_at 
FROM Users 
WHERE status = 'active'"

SQL Server

export DBCLI_CONNECTION="Server=.;Database=mydb;Trusted_Connection=True"
export DBCLI_DBTYPE="sqlserver"

dbcli ddl "
CREATE OR ALTER VIEW dbo.CustomerOrders AS
SELECT c.CustomerID, c.Name, COUNT(o.OrderID) as OrderCount
FROM Customers c
LEFT JOIN Orders o ON c.CustomerID = o.CustomerID
GROUP BY c.CustomerID, c.Name"

MySQL

export DBCLI_CONNECTION="Server=localhost;Database=mydb;Uid=root;Pwd=xxxxxxxxxx"
export DBCLI_DBTYPE="mysql"

dbcli ddl "
CREATE OR REPLACE VIEW ProductSummary AS
SELECT category, COUNT(*) as product_count, AVG(price) as avg_price
FROM Products
GROUP BY category"

PostgreSQL

export DBCLI_CONNECTION="Host=localhost;Database=mydb;Username=postgres;Password=xxxxxxxxxx"
export DBCLI_DBTYPE="postgresql"

dbcli ddl "
CREATE OR REPLACE VIEW public.recent_orders AS
SELECT * FROM orders WHERE order_date >= CURRENT_DATE - INTERVAL '30 days'"

Oracle

export DBCLI_CONNECTION="Data Source=orcl;User Id=system;Password=xxxxxxxxxx"
export DBCLI_DBTYPE="oracle"

dbcli ddl "
CREATE OR REPLACE VIEW emp_dept_view AS
SELECT e.employee_id, e.name, d.department_name
FROM employees e
JOIN departments d ON e.department_id = d.department_id"

DaMeng

export DBCLI_CONNECTION="Server=localhost;User Id=SYSDBA;PWD=xxxxxxxxxx;DATABASE=mydb"
export DBCLI_DBTYPE="dm"

dbcli ddl "
CREATE VIEW sales_summary AS
SELECT region, SUM(amount) as total_sales
FROM sales
GROUP BY region"

GaussDB

export DBCLI_CONNECTION="Host=localhost;Port=8000;Database=mydb;Username=gaussdb;Password=xxxxxxxxxx"
export DBCLI_DBTYPE="gaussdb"

dbcli ddl "
CREATE VIEW active_sessions AS
SELECT * FROM pg_stat_activity WHERE state = 'active'"

KingbaseES

export DBCLI_CONNECTION="Server=localhost;Port=54321;Database=mydb;UID=system;PWD=xxxxxxxxxx"
export DBCLI_DBTYPE="kdbndp"

dbcli ddl "
CREATE VIEW inventory_status AS
SELECT product_id, product_name, stock_quantity, 
       CASE WHEN stock_quantity < 10 THEN 'Low' ELSE 'OK' END as status
FROM inventory"

---

2. Alter View (Database-Specific)

SQL Server (CREATE OR ALTER)

export DBCLI_CONNECTION="Server=.;Database=mydb"
export DBCLI_DBTYPE="sqlserver"

dbcli ddl "
CREATE OR ALTER VIEW CustomerSummary AS
SELECT CustomerID, Name, Email, Phone
FROM Customers
WHERE Country = 'USA'"

MySQL (CREATE OR REPLACE)

export DBCLI_CONNECTION="Server=localhost;Database=mydb"
export DBCLI_DBTYPE="mysql"

dbcli ddl "
CREATE OR REPLACE VIEW OrderStats AS
SELECT DATE(order_date) as date, COUNT(*) as orders, SUM(total) as revenue
FROM Orders
GROUP BY DATE(order_date)"

PostgreSQL (CREATE OR REPLACE)

export DBCLI_CONNECTION="Host=localhost;Database=mydb"
export DBCLI_DBTYPE="postgresql"

dbcli ddl "
CREATE OR REPLACE VIEW user_activity AS
SELECT user_id, COUNT(*) as login_count, MAX(login_time) as last_login
FROM user_logins
WHERE login_time >= NOW() - INTERVAL '7 days'
GROUP BY user_id"

Oracle (CREATE OR REPLACE)

export DBCLI_CONNECTION="Data Source=orcl"
export DBCLI_DBTYPE="oracle"

dbcli ddl "
CREATE OR REPLACE VIEW dept_salary AS
SELECT department_id, AVG(salary) as avg_salary, MAX(salary) as max_salary
FROM employees
GROUP BY department_id"

---

3. Drop View

⚠️ WARNING: Dropping a view is irreversible. Export the view definition first!

Export View Definition First (Recommended)

export DBCLI_CONNECTION="Data Source=app.db"

# SQLite - Export view definition
dbcli query "
SELECT sql FROM sqlite_master WHERE type='view' AND name='ActiveUsers'" > view_backup.sql

# SQL Server - Export view definition
export DBCLI_CONNECTION="Server=.;Database=mydb"
export DBCLI_DBTYPE="sqlserver"
dbcli query "
SELECT OBJECT_DEFINITION(OBJECT_ID('dbo.CustomerOrders'))" > view_backup.sql

# MySQL - Export view definition
export DBCLI_CONNECTION="Server=localhost;Database=mydb"
export DBCLI_DBTYPE="mysql"
dbcli query "
SHOW CREATE VIEW ProductSummary" > view_backup.sql

# PostgreSQL - Export view definition
export DBCLI_CONNECTION="Host=localhost;Database=mydb"
export DBCLI_DBTYPE="postgresql"
dbcli query "
SELECT definition FROM pg_views WHERE viewname='recent_orders'" > view_backup.sql

Drop View Commands

SQLite

export DBCLI_CONNECTION="Data Source=app.db"
dbcli ddl "DROP VIEW IF EXISTS OldReport"

SQL Server

export DBCLI_CONNECTION="Server=.;Database=mydb"
export DBCLI_DBTYPE="sqlserver"
dbcli ddl "DROP VIEW IF EXISTS dbo.ObsoleteView"

MySQL

export DBCLI_CONNECTION="Server=localhost;Database=mydb"
export DBCLI_DBTYPE="mysql"
dbcli ddl "DROP VIEW IF EXISTS TempView"

PostgreSQL

export DBCLI_CONNECTION="Host=localhost;Database=mydb"
export DBCLI_DBTYPE="postgresql"
dbcli ddl "DROP VIEW IF EXISTS public.old_stats CASCADE"

Oracle

export DBCLI_CONNECTION="Data Source=orcl"
export DBCLI_DBTYPE="oracle"
dbcli ddl "DROP VIEW deprecated_view"

---

4. List Views

DbCli (recommended)

# DM / Oracle: list all accessible views (ALL_VIEWS)
export DBCLI_CONNECTION="Server=localhost;User Id=SYSDBA;PWD=xxxxxxxxxx;DATABASE=mydb"
export DBCLI_DBTYPE="dm"
dbcli views --scope all --owner DOC -f table

# Current user only (default scope)
export DBCLI_CONNECTION="Data Source=app.db"
dbcli views -f table

# Include definitions
dbcli views --with-definition -f table

SQLite

export DBCLI_CONNECTION="Data Source=app.db"
dbcli query "
SELECT name, sql FROM sqlite_master WHERE type='view' ORDER BY name" -f table

SQL Server

export DBCLI_CONNECTION="Server=.;Database=mydb"
export DBCLI_DBTYPE="sqlserver"
dbcli query "
SELECT TABLE_SCHEMA, TABLE_NAME, VIEW_DEFINITION
FROM INFORMATION_SCHEMA.VIEWS
ORDER BY TABLE_SCHEMA, TABLE_NAME" -f table

MySQL

export DBCLI_CONNECTION="Server=localhost;Database=mydb"
export DBCLI_DBTYPE="mysql"
dbcli query "
SELECT TABLE_SCHEMA, TABLE_NAME
FROM INFORMATION_SCHEMA.VIEWS
WHERE TABLE_SCHEMA = 'mydb'
ORDER BY TABLE_NAME" -f table

PostgreSQL

export DBCLI_CONNECTION="Host=localhost;Database=mydb"
dbcli -t postgresql query "
SELECT schemaname, viewname, definition
FROM pg_views
WHERE schemaname NOT IN ('pg_catalog', 'information_schema')
ORDER BY schemaname, viewname" -f table

Oracle

export DBCLI_CONNECTION="Data Source=orcl"
dbcli -t oracle query "
SELECT view_name, text FROM user_views ORDER BY view_name" -f table

---

5. View Definition Details

SQLite

export DBCLI_CONNECTION="Data Source=app.db"
dbcli query "
SELECT sql FROM sqlite_master WHERE type='view' AND name='ActiveUsers'"

SQL Server

export DBCLI_CONNECTION="Server=.;Database=mydb"
dbcli -t sqlserver query "
SELECT OBJECT_DEFINITION(OBJECT_ID('dbo.CustomerOrders'))"

MySQL

export DBCLI_CONNECTION="Server=localhost;Database=mydb"
dbcli -t mysql query "
SHOW CREATE VIEW ProductSummary"

PostgreSQL

export DBCLI_CONNECTION="Host=localhost;Database=mydb"
dbcli -t postgresql query "
SELECT pg_get_viewdef('public.recent_orders'::regclass, true)"

Oracle

export DBCLI_CONNECTION="Data Source=orcl"
dbcli -t oracle query "
SELECT text FROM user_views WHERE view_name = 'EMP_DEPT_VIEW'"

---

Code Integration Examples

Node.js / JavaScript

const { execSync } = require('child_process');
const fs = require('fs');

// Set connection
process.env.DBCLI_CONNECTION = 'Data Source=app.db';

// Create a view
function createView(viewName, query) {
  const sql = `CREATE VIEW ${viewName} AS ${query}`;
  execSync(`dbcli ddl "${sql}"`);
  console.log(`✅ View ${viewName} created`);
}

// Drop view with backup
function dropViewSafely(viewName) {
  // 1. Export view definition
  const definition = execSync(
    `dbcli query "SELECT sql FROM sqlite_master WHERE type='view' AND name='${viewName}'"`
  ).toString();
  
  const timestamp = new Date().toISOString().replace(/[:.]/g, '-');
  fs.writeFileSync(`backup_${viewName}_${timestamp}.sql`, definition);
  
  // 2. Drop view
  execSync(`dbcli ddl "DROP VIEW IF EXISTS ${viewName}"`);
  console.log(`✅ View ${viewName} dropped (backup saved)`);
}

// List all views
function listViews() {
  const result = JSON.parse(
    execSync('dbcli query "SELECT name FROM sqlite_master WHERE type=\'view\'"').toString()
  );
  return result;
}

// Usage
createView('ActiveUsers', 'SELECT * FROM Users WHERE status="active"');
console.log('Views:', listViews());
dropViewSafely('OldReport');

---

Python

import subprocess
import json
import os
from datetime import datetime

# Set connection
os.environ['DBCLI_CONNECTION'] = 'Data Source=app.db'

def create_view(view_name: str, query: str):
    """Create a database view"""
    sql = f"CREATE VIEW {view_name} AS {query}"
    subprocess.run(['dbcli', 'ddl', sql], check=True)
    print(f"✅ View {view_name} created")

def drop_view_safely(view_name: str):
    """Drop view with automatic backup"""
    # 1. Export view definition
    result = subprocess.run(
        ['dbcli', 'query', 
         f"SELECT sql FROM sqlite_master WHERE type='view' AND name='{view_name}'"],
        capture_output=True, text=True, check=True
    )
    definition = json.loads(result.stdout)[0]['sql']
    
    # 2. Save backup
    timestamp = datetime.now().strftime('%Y%m%d_%H%M%S')
    with open(f'backup_{view_name}_{timestamp}.sql', 'w') as f:
        f.write(definition)
    
    # 3. Drop view
    subprocess.run(['dbcli', 'ddl', 
                    f'DROP VIEW IF EXISTS {view_name}'], check=True)
    print(f"✅ View {view_name} dropped (backup saved)")

def list_views():
    """Get all views in database"""
    result = subprocess.run(
        ['dbcli', 'query',
         "SELECT name FROM sqlite_master WHERE type='view'"],
        capture_output=True, text=True, check=True
    )
    return json.loads(result.stdout)

# Usage
create_view('ActiveUsers', 'SELECT * FROM Users WHERE status="active"')
print('Views:', list_views())
drop_view_safely('OldReport')

---

PowerShell

# Set connection
$env:DBCLI_CONNECTION = "Data Source=app.db"

# Create a view
function New-DbView {
    param(
        [string]$ViewName,
        [string]$Query
    )
    
    $sql = "CREATE VIEW $ViewName AS $Query"
    dbcli ddl $sql
    Write-Host "✅ View $ViewName created" -ForegroundColor Green
}

# Drop view with backup
function Remove-DbViewSafely {
    param([string]$ViewName)
    
    # 1. Export view definition
    $definition = dbcli query "SELECT sql FROM sqlite_master WHERE type='view' AND name='$ViewName'"
    
    $timestamp = Get-Date -Format "yyyyMMdd_HHmmss"
    $definition | Out-File "backup_${ViewName}_${timestamp}.sql"
    
    # 2. Drop view
    dbcli ddl "DROP VIEW IF EXISTS $ViewName"
    Write-Host "✅ View $ViewName dropped (backup saved)" -ForegroundColor Green
}

# List all views
function Get-DbViews {
    $result = dbcli query "SELECT name FROM sqlite_master WHERE type='view'" | ConvertFrom-Json
    return $result
}

# Usage
New-DbView -ViewName "ActiveUsers" -Query "SELECT * FROM Users WHERE status='active'"
Get-DbViews
Remove-DbViewSafely -ViewName "OldReport"

---

Safety Best Practices

⚠️ Before Dropping Views

1. Export view definition:

   dbcli query "SELECT sql FROM sqlite_master WHERE type='view' AND name='ViewName'" > backup.sql
   

2. Check for dependencies:

   • Other views might reference this view
   • Application code might query this view
   • Reports or dashboards might depend on it

3. Test in development first:

   # Test environment
   export DBCLI_CONNECTION="Data Source=test.db"
   dbcli ddl "DROP VIEW TestView"
   
   # Then production
   export DBCLI_CONNECTION="Data Source=prod.db"
   dbcli ddl "DROP VIEW TestView"
   

🛡️ View Management Checklist

• Export view definition before dropping
• Check for dependent views or procedures
• Test view creation in development environment
• Document view purpose and columns
• Use naming conventions (e.g., vw_, v_ prefix)
• Review view performance (explain query plan)

---

Advanced Patterns

Materialized Views (Database-Specific)

PostgreSQL

export DBCLI_CONNECTION="Host=localhost;Database=mydb"

# Create materialized view
dbcli -t postgresql ddl "
CREATE MATERIALIZED VIEW monthly_sales AS
SELECT DATE_TRUNC('month', sale_date) as month, SUM(amount) as total
FROM sales
GROUP BY DATE_TRUNC('month', sale_date)"

# Refresh materialized view
dbcli -t postgresql ddl "
REFRESH MATERIALIZED VIEW monthly_sales"

Oracle

export DBCLI_CONNECTION="Data Source=orcl"

# Create materialized view
dbcli -t oracle ddl "
CREATE MATERIALIZED VIEW mv_sales_summary
BUILD IMMEDIATE
REFRESH FAST ON COMMIT
AS SELECT region, SUM(amount) FROM sales GROUP BY region"

# Refresh
dbcli -t oracle exec "
BEGIN DBMS_MVIEW.REFRESH('MV_SALES_SUMMARY'); END;"

Indexed Views (SQL Server)

export DBCLI_CONNECTION="Server=.;Database=mydb"

# Create view with schema binding (required for indexing)
dbcli -t sqlserver ddl "
CREATE VIEW dbo.SalesSummary
WITH SCHEMABINDING
AS
SELECT ProductID, COUNT_BIG(*) as OrderCount, SUM(Quantity) as TotalQuantity
FROM dbo.OrderDetails
GROUP BY ProductID"

# Create unique clustered index on view
dbcli -t sqlserver ddl "
CREATE UNIQUE CLUSTERED INDEX IX_SalesSummary_ProductID 
ON dbo.SalesSummary(ProductID)"

---

Troubleshooting

Common Errors

"View already exists"

# Use IF NOT EXISTS or OR REPLACE
dbcli ddl "CREATE VIEW IF NOT EXISTS MyView AS SELECT * FROM Users"
dbcli ddl "CREATE OR REPLACE VIEW MyView AS SELECT * FROM Users"

"Invalid column reference"

# Check that all referenced tables and columns exist
dbcli query "PRAGMA table_info(Users)"  # SQLite
dbcli query "DESCRIBE Users" -t mysql   # MySQL

"Insufficient privileges"

# Ensure user has CREATE VIEW permission
# SQL Server
dbcli query "SELECT HAS_PERMS_BY_NAME(DB_NAME(), 'DATABASE', 'CREATE VIEW')" -t sqlserver

---

Related Skills

• dbcli-query - Query views like tables
• dbcli-db-ddl - Manage table structures
• dbcli-index - Manage indexes
• dbcli-procedure - Manage stored procedures

---

Database-Specific Notes

Database	CREATE OR REPLACE	Materialized Views	Indexed Views
SQLite	❌ (Use DROP + CREATE)	❌	❌
SQL Server	✅ (2016+)	❌	✅ (Indexed Views)
MySQL	✅	❌	❌
PostgreSQL	✅	✅	❌
Oracle	✅	✅	❌
DaMeng	✅	✅	❌
GaussDB	✅	✅	❌
KingbaseES	✅	✅	❌

---

Connection String Reference

See CONNECTION_STRINGS.md for 30+ database connection string examples.

---

Support

For issues and questions:

• GitHub Issues: https://github.com/your-repo/dbcli/issues
• Documentation: https://github.com/your-repo/dbcli

---

License: MIT
Version: 1.0.0