Feature: Add exclusion violation error kind (transact-rs#3918)

* feat: add exclusion violation error kind

* chore: add test for exclusion error kind

Author: barskern

sqlx-core/src/error.rs

@@ -197,6 +197,8 @@ pub enum ErrorKind {
     NotNullViolation,
     /// Check constraint violation.
     CheckViolation,
+    /// Exclusion constraint violation.
+    ExclusionViolation,
     /// An unmapped error.
     Other,
 }

sqlx-postgres/src/error.rs

@@ -214,6 +214,7 @@ impl DatabaseError for PgDatabaseError {
             error_codes::FOREIGN_KEY_VIOLATION => ErrorKind::ForeignKeyViolation,
             error_codes::NOT_NULL_VIOLATION => ErrorKind::NotNullViolation,
             error_codes::CHECK_VIOLATION => ErrorKind::CheckViolation,
+            error_codes::EXCLUSION_VIOLATION => ErrorKind::ExclusionViolation,
             _ => ErrorKind::Other,
         }
     }
@@ -239,4 +240,6 @@ pub(crate) mod error_codes {
     pub const NOT_NULL_VIOLATION: &str = "23502";
     /// Caused when a check constraint is violated.
     pub const CHECK_VIOLATION: &str = "23514";
+    /// Caused when a exclude constraint is violated.
+    pub const EXCLUSION_VIOLATION: &str = "23P01";
 }

tests/postgres/error.rs

@@ -75,6 +75,28 @@ async fn it_fails_with_check_violation() -> anyhow::Result<()> {
     Ok(())
 }
 
+#[sqlx_macros::test]
+async fn it_fails_with_exclude_violation() -> anyhow::Result<()> {
+    let mut conn = new::<Postgres>().await?;
+    let mut tx = conn.begin().await?;
+
+    sqlx::query("INSERT INTO circles VALUES (circle('(0,0)'::point, 5.0));")
+        .execute(&mut *tx)
+        .await?;
+
+    let res: Result<_, sqlx::Error> =
+        sqlx::query("INSERT INTO circles VALUES (circle('(0,2.0)'::point, 2.0));")
+            .execute(&mut *tx)
+            .await;
+    let err = res.unwrap_err();
+
+    let err = err.into_database_error().unwrap();
+
+    assert_eq!(err.kind(), ErrorKind::ExclusionViolation);
+
+    Ok(())
+}
+
 #[sqlx_macros::test]
 async fn it_fails_with_begin_failed() -> anyhow::Result<()> {
     let mut conn = new::<Postgres>().await?;

tests/postgres/setup.sql

@@ -63,3 +63,8 @@ CREATE SCHEMA IF NOT EXISTS foo;
 CREATE TYPE foo."Foo" as ENUM ('Bar', 'Baz');
 
 CREATE TABLE mytable(f HSTORE);
+
+CREATE TABLE circles (
+    c circle,
+    EXCLUDE USING gist (c WITH &&)
+);