UpdateRowRequest

Struct UpdateRowRequest 

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pub struct UpdateRowRequest {
    pub table_name: String,
    pub row: Row,
    pub row_condition: RowExistenceExpectation,
    pub column_condition: Option<Filter>,
    pub return_type: Option<ReturnType>,
    pub return_columns: HashSet<String>,
    pub transaction_id: Option<String>,
}
Expand description

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§table_name: String

表名

§row: Row

要更新的行。包括主键列和值列。

该行本次需要更新的全部属性列,表格存储会根据 row_change 中 UpdateType 的内容在该行中新增、修改或者删除指定列的值。 该行已存在的且不在 row_change 中的列将不受影响。

§row_condition: RowExistenceExpectation

在数据写入前是否进行存在性检查。取值范围如下:

  • Ignore(默认):不做行存在性检查。
  • ExpectExist :期望行存在。
  • ExpectNotExist :期望行不存在。
§column_condition: Option<Filter>

进行行存在性检查的时候,可以附加列过滤器

§return_type: Option<ReturnType>

返回数据设置。目前仅支持返回主键,主要用于主键列自增功能。

ReturnType

§return_columns: HashSet<String>

如果需要返回数据,可以指定要返回的列

§transaction_id: Option<String>

局部事务ID。当使用局部事务功能写入数据时必须设置此参数。

Implementations§

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impl UpdateRowRequest

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pub fn new(table_name: &str) -> Self

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pub fn row(self, row: Row) -> Self

设置要更新的行数据

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pub fn row_condition(self, row_condition: RowExistenceExpectation) -> Self

设置行存在性检查

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pub fn column_condition(self, col_condition: Filter) -> Self

设置行存在性检查中的过滤器

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pub fn return_type(self, return_type: ReturnType) -> Self

设置返回值类型

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pub fn return_column(self, col_name: impl Into<String>) -> Self

添加一个要返回的列

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pub fn return_columns( self, col_names: impl IntoIterator<Item = impl Into<String>>, ) -> Self

设置要返回的列

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pub fn transaction_id(self, tx_id: impl Into<String>) -> Self

设置事务 ID

Trait Implementations§

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impl Clone for UpdateRowRequest

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fn clone(&self) -> UpdateRowRequest

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for UpdateRowRequest

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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 UpdateRowRequest

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fn default() -> UpdateRowRequest

Returns the “default value” for a type. Read more
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impl From<UpdateRowRequest> for UpdateRowRequest

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fn from(value: UpdateRowRequest) -> UpdateRowRequest

Converts to this type from the input type.

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