Struct QueryStatEntry 

#[non_exhaustive]
pub struct QueryStatEntry {
    pub query_id: String,
    pub query_text: String,
    pub calls: u64,
    pub total_exec_time_ms: f64,
    pub mean_exec_time_ms: f64,
    pub min_exec_time_ms: f64,
    pub max_exec_time_ms: f64,
    pub rows_returned: u64,
    pub cache_hit_ratio: Option<f64>,
    pub database_specific: Value,
}

A single entry from the database’s query performance statistics.

Each entry represents aggregated execution metrics for one normalized query (identified by query_id). The exact semantics of each field depend on the underlying database, but all backends normalize into this common shape.

Database-specific fields (e.g., PostgreSQL’s shared_blks_hit) are available in database_specific as a free-form JSON value.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

query_id: String

Opaque identifier for the normalized query (e.g., PG queryid).

query_text: String

The normalized query text (parameters replaced with placeholders).

calls: u64

Total number of times this query has been executed.

total_exec_time_ms: f64

Total execution time across all calls, in milliseconds.

mean_exec_time_ms: f64

Mean execution time per call, in milliseconds.

min_exec_time_ms: f64

Minimum execution time observed, in milliseconds.

max_exec_time_ms: f64

Maximum execution time observed, in milliseconds.

rows_returned: u64

Total rows returned across all calls.

cache_hit_ratio: Option<f64>

Cache/buffer hit ratio (0.0–1.0), if available from the backend.

database_specific: Value

Additional backend-specific statistics as free-form JSON.

Trait Implementations

impl Clone for QueryStatEntry

fn clone(&self) -> QueryStatEntry

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for QueryStatEntry

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for QueryStatEntry

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for QueryStatEntry

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.