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DatabaseHeader

clt_database::storage::sqlite3_ondisk

Struct DatabaseHeader 

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pub struct DatabaseHeader {
Show 22 fields
    pub magic: [u8; 16],
    pub page_size: PageSize,
    pub write_version: RawVersion,
    pub read_version: RawVersion,
    pub reserved_space: u8,
    pub max_embed_frac: u8,
    pub min_embed_frac: u8,
    pub leaf_frac: u8,
    pub change_counter: U32BE,
    pub database_size: U32BE,
    pub freelist_trunk_page: U32BE,
    pub freelist_pages: U32BE,
    pub schema_cookie: U32BE,
    pub schema_format: U32BE,
    pub default_page_cache_size: CacheSize,
    pub vacuum_mode_largest_root_page: U32BE,
    pub text_encoding: TextEncoding,
    pub user_version: I32BE,
    pub incremental_vacuum_enabled: U32BE,
    pub application_id: I32BE,
    pub version_valid_for: U32BE,
    pub version_number: U32BE,
    /* private fields */

}
Expand description

Database Header Format

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§magic: [u8; 16]

b“SQLite format 3\0“

§page_size: PageSize

Page size in bytes. Must be a power of two between 512 and 32768 inclusive, or the value 1 representing a page size of 65536.

§write_version: RawVersion

File format write version. 1 for legacy; 2 for WAL.

§read_version: RawVersion

File format read version. 1 for legacy; 2 for WAL.

§reserved_space: u8

Bytes of unused “reserved” space at the end of each page. Usually 0.

§max_embed_frac: u8

Maximum embedded payload fraction. Must be 64.

§min_embed_frac: u8

Minimum embedded payload fraction. Must be 32.

§leaf_frac: u8

Leaf payload fraction. Must be 32.

§change_counter: U32BE

File change counter.

§database_size: U32BE

Size of the database file in pages. The “in-header database size”.

§freelist_trunk_page: U32BE

Page number of the first freelist trunk page.

§freelist_pages: U32BE

Total number of freelist pages.

§schema_cookie: U32BE

The schema cookie.

§schema_format: U32BE

The schema format number. Supported schema formats are 1, 2, 3, and 4.

§default_page_cache_size: CacheSize

Default page cache size.

§vacuum_mode_largest_root_page: U32BE

The page number of the largest root b-tree page when in auto-vacuum or incremental-vacuum modes, or zero otherwise.

§text_encoding: TextEncoding

Text encoding.

§user_version: I32BE

The “user version” as read and set by the user_version pragma.

§incremental_vacuum_enabled: U32BE

True (non-zero) for incremental-vacuum mode. False (zero) otherwise.

§application_id: I32BE

The “Application ID” set by PRAGMA application_id.

§version_valid_for: U32BE

The version-valid-for number.

§version_number: U32BE

SQLITE_VERSION_NUMBER

Implementations§

Trait Implementations§

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impl Clone for DatabaseHeader

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fn clone(&self) -> DatabaseHeader

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Copy for DatabaseHeader

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impl Debug for DatabaseHeader

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Default for DatabaseHeader

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl Pod for DatabaseHeader

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impl Zeroable for DatabaseHeader

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fn zeroed() -> Self

Calls zeroed. Read more

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Gets the TypeId of self. Read more
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