Trait transact::database::DatabaseWriter

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pub trait DatabaseWriter: DatabaseReader {
    // Required methods
    fn put(&mut self, key: &[u8], value: &[u8]) -> Result<(), DatabaseError>;
    fn overwrite(
        &mut self,
        key: &[u8],
        value: &[u8]
    ) -> Result<(), DatabaseError>;
    fn delete(&mut self, key: &[u8]) -> Result<(), DatabaseError>;
    fn index_put(
        &mut self,
        index: &str,
        key: &[u8],
        value: &[u8]
    ) -> Result<(), DatabaseError>;
    fn index_delete(
        &mut self,
        index: &str,
        key: &[u8]
    ) -> Result<(), DatabaseError>;
    fn commit(self: Box<Self>) -> Result<(), DatabaseError>;
    fn as_reader(&self) -> &dyn DatabaseReader;
}
Expand description

A DatabaseReader provides read access to a database instance.

Required Methods§

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fn put(&mut self, key: &[u8], value: &[u8]) -> Result<(), DatabaseError>

Writes the given key/value pair. If the key/value pair already exists, it will return a DatabaseError::DuplicateEntry.

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fn overwrite(&mut self, key: &[u8], value: &[u8]) -> Result<(), DatabaseError>

Writes the given key/value pair. If the key/value pair already exists, it overwrites the old value

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fn delete(&mut self, key: &[u8]) -> Result<(), DatabaseError>

Deletes the given key/value pair. If the key does exist, it returns an error,

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fn index_put( &mut self, index: &str, key: &[u8], value: &[u8] ) -> Result<(), DatabaseError>

Writes the given key/value pair at index.

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fn index_delete(&mut self, index: &str, key: &[u8]) -> Result<(), DatabaseError>

Deletes the given key/value pair at index.

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fn commit(self: Box<Self>) -> Result<(), DatabaseError>

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fn as_reader(&self) -> &dyn DatabaseReader

Implementors§