errors

var (
	NotImplemented     Error = New(CodeNotImplemented, "Not implemented")
	NoDatabase         Error = New(CodeNoDatabase, "No database connection")
	UnknownDriver      Error = New(CodeUnknownDriver, "Unknown driver")
	NoTableName        Error = New(CodeNoTableName, "No table name")
	NoWhereClause      Error = New(CodeNoWhereClause, "No where clause in query")
	FieldNull          Error = New(CodeFieldNull, "Field cannot be null")
	LastInsertId       Error = New(CodeLastInsertId, "Last insert id is not valid")
	UnsupportedLookup  Error = New(CodeUnsupportedLookup, "Unsupported lookup type")
	AlreadyExecuted    Error = New(CodeAlreadyExecuted, "Query has already been executed")
	CheckFailed        Error = New(CodeCheckFailed, "Check failed")
	InvalidContentType Error = New(CodeContentTypeNotFound, "Content type not found")

	TypeMismatch  Error = New(CodeTypeMismatch, "received type does not match expected type")
	NilPointer    Error = New(CodeNilPointer, "received nil pointer, expected a pointer to initialized value")
	FieldNotFound Error = New(CodeFieldNotFound, "field not found in model definition")
	ValueError    Error = New(CodeValueError, "error retrieving value")
	NoUniqueKey   Error = New(CodeNoUniqueKey, "could not find unique key for model")
	SaveFailed    Error = New(CodeSaveFailed, "failed to save model")

	NoChanges          Error = New(CodeNoChanges, "No changes were made", sql.ErrNoRows)
	NoResults          Error = New(CodeNoResults, "No results found", sql.ErrNoRows)
	NoRows             Error = New(CodeNoRows, "No rows in result set", sql.ErrNoRows, NoResults)
	MultipleRows       Error = New(CodeMultipleRows, "Multiple rows in result set")
	UnexpectedRowCount Error = New(CodeUnexpectedRowCount, "Unexpected row count in result set", sql.ErrNoRows)

	// Common Errors Across All
	GenericError         DatabaseError = dbError(CodeGenericError, "Error")
	ConnectionFailed     DatabaseError = dbError(CodeConnectionFailed, "Failed to connect to database")
	AuthenticationFailed DatabaseError = dbError(CodeAuthenticationFailed, "Invalid username or password")
	ProtocolError        DatabaseError = dbError(CodeProtocolError, "Database protocol error")
	Timeout              DatabaseError = dbError(CodeTimeout, "Operation timed out")
	InternalError        DatabaseError = dbError(CodeInternalError, "Internal database error")
	ConnectionClosed     DatabaseError = dbError(CodeConnectionClosed, "Connection already closed")
	ConnectionLost       DatabaseError = dbError(CodeConnectionLost, "Lost connection to database server")

	// DDL/Schema Errors
	Exists             DatabaseError = &databaseError{code: CodeExists}
	NotExists          DatabaseError = &databaseError{code: CodeNotExists}
	InvalidTable       DatabaseError = dbError(CodeInvalidTable, "Invalid or unknown table", NoTableName, TableNotFound)
	TableExists        DatabaseError = dbError(CodeTableExists, "Table already exists", Exists)
	TableNotFound      DatabaseError = dbError(CodeTableNotFound, "Table does not exist", NotExists)
	InvalidColumn      DatabaseError = dbError(CodeInvalidColumn, "Invalid or unknown column", FieldNotFound)
	ColumnExists       DatabaseError = dbError(CodeColumnExists, "Column already exists", Exists)
	ColumnNotFound     DatabaseError = dbError(CodeColumnNotFound, "Column does not exist", NotExists)
	IndexExists        DatabaseError = dbError(CodeIndexExists, "Index already exists", Exists)
	IndexNotFound      DatabaseError = dbError(CodeIndexNotFound, "Index does not exist", NotExists)
	ConstraintExists   DatabaseError = dbError(CodeConstraintExists, "Constraint already exists", Exists)
	ConstraintNotFound DatabaseError = dbError(CodeConstraintNotFound, "Constraint not found", NotExists)

	// Data & Type Errors
	DBTypeMismatch      DatabaseError = dbError(CodeDBTypeMismatch, "Type mismatch or invalid cast", TypeMismatch)
	InvalidEnumValue    DatabaseError = dbError(CodeInvalidEnum, "Invalid enum value")
	StringTooLong       DatabaseError = dbError(CodeStringTooLong, "String value is too long")
	InvalidDefaultValue DatabaseError = dbError(CodeInvalidDefault, "Invalid default value")
	DateOutOfRange      DatabaseError = dbError(CodeDateOutOfRange, "Date/time value out of range")
	EncodingError       DatabaseError = dbError(CodeEncodingError, "Invalid character encoding")
	PrecisionLoss       DatabaseError = dbError(CodePrecisionLoss, "Value lost precision during conversion")
	DivisionByZero      DatabaseError = dbError(CodeDivisionByZero, "Division by zero")

	// Constraint errors
	ConstraintViolation DatabaseError = dbError(CodeConstraintViolation, "Constraint violation")
	ForeignKeyViolation DatabaseError = dbError(CodeForeignKeyViolation, "Foreign key constraint failed", ConstraintViolation)
	UniqueViolation     DatabaseError = dbError(CodeUniqueViolation, "Unique constraint failed", ConstraintViolation)
	NullViolation       DatabaseError = dbError(CodeNotNullViolation, "NULL value in non-null column", FieldNull)
	CheckViolation      DatabaseError = dbError(CodeCheckConstraintViolation, "Check constraint failed", ConstraintViolation)

	// Transaction Errors
	TransactionStarted       DatabaseError = dbError(CodeTransactionStarted, "Transaction already started")
	TransactionDeadlock      DatabaseError = dbError(CodeTransactionDeadlock, "Transaction deadlock detected")
	FailedStartTransaction   DatabaseError = dbError(CodeFailedStartTransaction, "Failed to start transaction")
	NoTransaction            DatabaseError = dbError(CodeNoTransaction, "Transaction was not started")
	TransactionNil           DatabaseError = dbError(CodeTransactionNil, "Transaction is nil", NoTransaction)
	RollbackFailed           DatabaseError = dbError(CodeRollbackFailed, "Failed to rollback transaction", sql.ErrTxDone)
	CommitFailed             DatabaseError = dbError(CodeCommitFailed, "Failed to commit transaction", sql.ErrTxDone)
	SavepointFailed          DatabaseError = dbError(CodeSavepointFailed, "Failed to create savepoint in transaction")
	CrossDatabaseTransaction DatabaseError = dbError(CodeCrossDatabaseTransaction, "Cross-database transaction is not allowed")

	// Query / QueryRow / Exec
	SyntaxError          DatabaseError = dbError(CodeSyntaxError, "Syntax error in SQL statement")
	DeadlockDetected     DatabaseError = dbError(CodeDeadlockDetected, "Deadlock detected")
	QueryCanceled        DatabaseError = dbError(CodeQueryCanceled, "Query was canceled")
	QueryTimeout         DatabaseError = dbError(CodeQueryTimeout, "Query execution timed out")
	TooManyConnections   DatabaseError = dbError(CodeTooManyConnections, "Too many connections", IOError)
	OutOfMemory          DatabaseError = dbError(CodeOutOfMemory, "Database out of memory", IOError)
	IOError              DatabaseError = dbError(CodeIOError, "I/O error occurred during operation")
	DiskFull             DatabaseError = dbError(CodeDiskFull, "Disk full or write failure", IOError)
	PermissionDenied     DatabaseError = dbError(CodePermissionDenied, "Permission denied for operation")
	SerializationFailure DatabaseError = dbError(CodeSerializationFailure, "Could not serialize access due to concurrent update")

	// Planning / Execution
	AmbiguousColumn        DatabaseError = dbError(CodeAmbiguousColumn, "Ambiguous column reference")
	UnsupportedFeature     DatabaseError = dbError(CodeUnsupportedFeature, "Feature not supported by this database")
	FunctionNotImplemented DatabaseError = dbError(CodeFunctionNotImplemented, "Function not implemented by this database")
	InvalidCast            DatabaseError = dbError(CodeInvalidCast, "Invalid type cast", DBTypeMismatch)

	// System/Internal
	CorruptedData     DatabaseError = dbError(CodeCorruptedData, "Database file/data corrupted")
	InconsistentState DatabaseError = dbError(CodeInconsistentState, "Internal database state is inconsistent")
	AssertionFailure  DatabaseError = dbError(CodeAssertionFailure, "Internal assertion failed")
)