A migration is essentially a mini-snapshot of a “point-in-time” of your database model. Transformed or even transferred while the changes are applied, and modern applications are expected to run with minimal downtime.Ī major benefit of using EF Core is the ability to manage schema changes through a mechanism called migrations. The data in existing columns may need to be Not onlyĭo the code and data need to remain in synch, but alterations to schema definitions can cause side effects that ripple across tables. On the other hand, updates that involve changes to the database are inevitably more complex. Replacing binary files or pointing the load balancer to new nodes. Updates to code can often be deployed simply by The changes are reflected in your code, your schema, and your data. CompressedSize64 uint64 UncompressedSize64 uint64 Extra byte ExternalAttrs uint32 // Meaning depends on CreatorVersion}įileHeader describes a file within a zip file.Today, the EF Core team would like to introduce you to a new feature that shipped in our latest preview release: migration bundles.īusiness applications evolve with time. UncompressedSize uint32 // Deprecated: Use UncompressedSize64 instead. CRC32 uint32 CompressedSize uint32 // Deprecated: Use CompressedSize64 instead. ModifiedDate uint16 // Deprecated: Legacy MS-DOS time use Modified instead. Time ModifiedTime uint16 // Deprecated: Legacy MS-DOS date use Modified instead. The legacy MS-DOS date field is encoded according to the // location of the Modified time. // When writing, an extended timestamp (which is timezone-agnostic) is // always emitted. If only the MS-DOS date is present, the timezone is assumed to be UTC. // When reading, an extended timestamp is preferred over the legacy MS-DOS // date field, and the offset between the times is used as the timezone. Method uint16 // Modified is the modified time of the file. NonUTF8 bool CreatorVersion uint16 ReaderVersion uint16 Flags uint16 // Method is the compression method. Otherwise, the Writer // automatically sets the ZIP format's UTF-8 flag for valid UTF-8 strings. // This flag should only be set if the user intends to encode a non-portable // ZIP file for a specific localized region. // By specification, the only other encoding permitted should be CP-437, // but historically many ZIP readers interpret Name and Comment as whatever // the system's local character encoding happens to be. Name string // Comment is any arbitrary user-defined string shorter than 64KiB.Ĝomment string // NonUTF8 indicates that Name and Comment are not encoded in UTF-8. It is the caller's responsibility to sanitize it as // appropriate, including canonicalizing slash directions, // validating that paths are relative, and preventing path // traversal through filenames ("./././"). // When reading zip files, the Name field is populated from // the zip file directly and is not validated for correctness. A trailing slash // indicates that this file is a directory and should have no data. // It must be a relative path, not start with a drive letter (such as "C:"), // and must use forward slashes instead of back slashes. func (w *Writer) SetComment(comment string) error.func (w *Writer) RegisterCompressor(method uint16, comp Compressor).func (w *Writer) CreateRaw(fh *FileHeader) (io.Writer, error).func (w *Writer) CreateHeader(fh *FileHeader) (io.Writer, error).func (w *Writer) Create(name string) (io.Writer, error).func (z *Reader) RegisterDecompressor(method uint16, dcomp Decompressor).func (r *Reader) Open(name string) (fs.File, error).func NewReader(r io.ReaderAt, size int64) (*Reader, error).func OpenReader(name string) (*ReadCloser, error).func (h *FileHeader) SetMode(mode fs.FileMode).func (h *FileHeader) SetModTime(t time.Time) deprecated.func (h *FileHeader) Mode() (mode fs.FileMode).func (h *FileHeader) ModTime() time.Time deprecated.func (h *FileHeader) FileInfo() fs.FileInfo.func FileInfoHeader(fi fs.FileInfo) (*FileHeader, error). func (f *File) OpenRaw() (io.Reader, error).func (f *File) Open() (io.ReadCloser, error).func (f *File) DataOffset() (offset int64, err error).func RegisterDecompressor(method uint16, dcomp Decompressor).func RegisterCompressor(method uint16, comp Compressor).The ZIP64 format the 32 bit fields will be 0xffffffff and the 64 bit The 64 bit fields will always contain the correct value andįor normal archives both fields will be the same. To be backwards compatible the FileHeader has both 32 and 64 bit Sizeįields. This package does not support disk spanning. Package zip provides support for reading and writing ZIP archives.
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