Int type tolerance and better SQLDataType conversion error message

Author: ahmedk92

Sources/SwiftSQL/SQLDataType.swift

@@ -12,6 +12,7 @@ import SQLite3
 public protocol SQLDataType {
     func sqlBind(statement: OpaquePointer, index: Int32)
     static func sqlColumn(statement: OpaquePointer, index: Int32) -> Self
+    static func convert(from value: Any) -> Self?
 }
 
 public extension SQLDataType {
@@ -26,6 +27,11 @@ extension Int: SQLDataType {
     public static func sqlColumn(statement: OpaquePointer, index: Int32) -> Int {
         Int(sqlite3_column_int64(statement, index))
     }
+    
+    public static func convert(from value: Any) -> Int? {
+        guard let int64 = value as? Int64 else { return nil }
+        return Int(int64)
+    }
 }
 
 extension Int32: SQLDataType {

Sources/SwiftSQLExt/SwiftSQLExt.swift

@@ -71,7 +71,11 @@ public struct SQLRow {
     ///
     /// - parameter index: The leftmost column of the result set has the index 0.
     public subscript<T: SQLDataType>(index: Int) -> T {
-        T.convert(from: values[index]!)!
+        let value = values[index]!
+        guard let convertedValue = T.convert(from: value) else {
+            fatalError("Could not convert \(type(of: value)). Make sure target type (\(T.self)) correctly implements convert(from:).")
+        }
+        return convertedValue
     }
 
     /// Returns a single column of the current result row of a query. If the

Tests/SwiftSQLExtTests/SwiftSQLExtTests.swift

@@ -170,9 +170,9 @@ private extension SQLConnection {
 
 private struct User: Hashable, SQLRowDecodable {
     let name: String
-    let level: Int64
+    let level: Int
 
-    init(name: String, level: Int64) {
+    init(name: String, level: Int) {
         self.name = name
         self.level = level
     }