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# 📚 PyQt5 Tutorial - Part 4/6: Database Integration & Data Visualization
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Welcome to Part 4 of our PyQt5 series! This comprehensive lesson covers professional database integration, data visualization, and architectural patterns for building robust desktop applications.

---

## 🔹 Database Integration with PyQt5
### 1. SQLite Connection & Setup

from PyQt5.QtSql import QSqlDatabase, QSqlQuery

def setup_database():
    db = QSqlDatabase.addDatabase("QSQLITE")
    db.setDatabaseName("app_data.db")
    
    if not db.open():
        QMessageBox.critical(None, "Database Error", db.lastError().text())
        return False
    
    # Create tables if they don't exist
    query = QSqlQuery()
    query.exec_("""
        CREATE TABLE IF NOT EXISTS contacts (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            name TEXT NOT NULL,
            email TEXT UNIQUE,
            phone TEXT,
            created_at DATETIME DEFAULT CURRENT_TIMESTAMP
        )
    """)
    return True

### 2. SQL Model-View Integration

from PyQt5.QtSql import QSqlTableModel

class ContactManager(QWidget):
    def __init__(self):
        super().__init__()
        self.model = QSqlTableModel()
        self.model.setTable("contacts")
        self.model.select()
        
        self.setup_ui()
    
    def setup_ui(self):
        layout = QVBoxLayout()
        
        # Table View
        self.table = QTableView()
        self.table.setModel(self.model)
        self.table.setSelectionBehavior(QTableView.SelectRows)
        self.table.setEditTriggers(QTableView.DoubleClicked)
        
        # Buttons
        add_btn = QPushButton("Add Contact")
        add_btn.clicked.connect(self.add_contact)
        
        del_btn = QPushButton("Delete Selected")
        del_btn.clicked.connect(self.delete_contact)
        
        # Layout
        btn_layout = QHBoxLayout()
        btn_layout.addWidget(add_btn)
        btn_layout.addWidget(del_btn)
        
        layout.addWidget(self.table)
        layout.addLayout(btn_layout)
        self.setLayout(layout)
    
    def add_contact(self):
        name, ok = QInputDialog.getText(self, "Add Contact", "Name:")
        if ok and name:
            record = self.model.record()
            record.setValue("name", name)
            self.model.insertRecord(-1, record)
            self.model.submitAll()
    
    def delete_contact(self):
        selected = self.table.selectionModel().selectedRows()
        for index in sorted(selected, reverse=True):
            self.model.removeRow(index.row())
        self.model.submitAll()

### 3. PostgreSQL Connection

def connect_postgresql():
    db = QSqlDatabase.addDatabase("QPSQL")
    db.setHostName("localhost")
    db.setDatabaseName("myapp")
    db.setUserName("postgres")
    db.setPassword("password")
    db.setPort(5432)
    
    if not db.open():
        error = db.lastError()
        QMessageBox.critical(None, "Database Error", 
                           f"Code: {error.number()}\n{error.text()}")
        return False
    return True

---