Commits on Mar 25, 2021

1. Add typeForColumn functions …

   * Add `typeForColumn` and `typeForColumnIndex` methods and tests
   * Update warnings in `dataForColumn` and `dataForColumnIndex` to describe SQLite behavior re zero-length blobs
   * Bump version to 2.7.8
   
   This should permit accurate handling of zero-length BLOBs, e.g., in Swift:
   
   ```swift
   let fileURL = URL(fileURLWithPath: NSTemporaryDirectory())
       .appendingPathComponent("test.sqlite")
   
   do {
       let db = FMDatabase(url: fileURL)
       db.open()
       try db.executeUpdate("CREATE TABLE test (data BLOB)", values: nil)
       let data = "foo".data(using: .utf8)!
       let sql = "INSERT INTO test (data) VALUES (?)"
       try db.executeUpdate(sql, values: [data])
       try db.executeUpdate(sql, values: [Data()])
       try db.executeUpdate(sql, values: [NSNull()])
   
       let rs = try db.executeQuery("SELECT * FROM test", values: nil)
       while rs.next() {
           let type = rs.type(forColumnIndex: 0)
           switch type {
           case .blob:
               if let data = rs.data(forColumnIndex: 0) {
                   print("blob with \(data.count) bytes")
               } else {
                   print("blob but no data")
               }
   
           case .null:
               print("Null")
   
           default:
               print("type is \(type)")
           }
       }
   } catch {
       print(error)
   }
   ```
   
   That will produce:
   
   ```
   blob with 3 bytes
   blob but no data
   Null
   ```

   

   robertmryan committed Mar 25, 2021
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