bc-code-intelligence-mcp/embedded-knowledge/domains/eva-errors/samples/table-safety-validation-patterns.md

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# Table Safety Validation Patterns

## IsTemporary Safeguard Implementation
```al
procedure ProcessBulkData(var DataBuffer: Record "Data Processing Buffer")
begin
    // Always validate temporary status before bulk operations
    if not DataBuffer.IsTemporary then
        Error('This procedure requires a temporary table to prevent data corruption.');
        
    DataBuffer.Reset();
    if DataBuffer.FindSet() then
        repeat
            ProcessIndividualRecord(DataBuffer);
            DataBuffer.Delete(); // Safe because table is confirmed temporary
        until DataBuffer.Next() = 0;
end;
```

## Database Write Protection
```al
procedure SafeDataManipulation(var TempCustomer: Record Customer temporary)
var
    Customer: Record Customer;
begin
    // Validate temporary status before any modifications
    if not TempCustomer.IsTemporary then
        Error('Database safety violation: Expected temporary table for data manipulation.');
        
    // Safe to perform destructive operations
    TempCustomer.Reset();
    TempCustomer.DeleteAll();
    
    // Load fresh data from permanent table
    Customer.FindSet();
    repeat
        TempCustomer := Customer;
        TempCustomer.Insert();
    until Customer.Next() = 0;
end;
```

## Bulk Operation Validation
```al
procedure ProcessLargeDataSet(var TempItem: Record Item temporary; ProcessingMode: Option Validate,Update,Delete)
begin
    // Critical safety check for bulk operations
    if not TempItem.IsTemporary then
        Error('Bulk processing operations require temporary tables. This prevents accidental permanent data modification.');
        
    case ProcessingMode of
        ProcessingMode::Validate:
            ValidateAllRecords(TempItem);
        ProcessingMode::Update:
            UpdateAllRecords(TempItem);
        ProcessingMode::Delete:
            TempItem.DeleteAll(); // Safe deletion
    end;
end;

local procedure ValidateAllRecords(var TempItem: Record Item temporary)
begin
    TempItem.Reset();
    if TempItem.FindSet() then
        repeat
            ValidateItemData(TempItem);
        until TempItem.Next() = 0;
end;
```

## Data Integrity Protection
```al
procedure SecureDataProcessing(var WorkingTable: Record "Working Data Buffer")
var
    OriginalFilters: Text;
begin
    // Mandatory safety validation
    if not WorkingTable.IsTemporary then
        Error('Data integrity protection: This operation requires a temporary working table.');
        
    OriginalFilters := WorkingTable.GetFilters();
    
    try
        WorkingTable.Reset();
        ProcessAllRecords(WorkingTable);
    finally
        // Restore original state
        WorkingTable.Reset();
        WorkingTable.SetView(OriginalFilters);
    end;
end;

local procedure ProcessAllRecords(var WorkingTable: Record "Working Data Buffer")
begin
    if WorkingTable.FindSet(true) then
        repeat
            WorkingTable."Processing Status" := WorkingTable."Processing Status"::Completed;
            WorkingTable.Modify();
        until WorkingTable.Next() = 0;
end;
```