Rework DbErr

src/database/mock.rs

@@ -75,7 +75,7 @@ impl MockDatabaseTrait for MockDatabase {
                 result: ExecResultHolder::Mock(std::mem::take(&mut self.exec_results[counter])),
             })
         } else {
-            Err(DbErr::Exec)
+            Err(DbErr::Exec("`exec_results` buffer is empty.".to_owned()))
         }
     }
 
@@ -93,7 +93,7 @@ impl MockDatabaseTrait for MockDatabase {
                 })
                 .collect())
         } else {
-            Err(DbErr::Query)
+            Err(DbErr::Query("`query_results` buffer is empty.".to_owned()))
         }
     }
 

src/database/mod.rs

@@ -29,6 +29,6 @@ impl Database {
         if crate::MockDatabaseConnector::accepts(string) {
             return crate::MockDatabaseConnector::connect(string).await;
         }
-        Err(DbErr::Conn)
+        Err(DbErr::Conn(format!("The connection string '{}' has no supporting driver.", string)))
     }
 }

src/driver/mod.rs

@@ -1,5 +1,7 @@
 #[cfg(feature = "mock")]
 mod mock;
+#[cfg(feature = "sqlx-dep")]
+mod sqlx_common;
 #[cfg(feature = "sqlx-mysql")]
 mod sqlx_mysql;
 #[cfg(feature = "sqlx-sqlite")]
@@ -7,6 +9,8 @@ mod sqlx_sqlite;
 
 #[cfg(feature = "mock")]
 pub use mock::*;
+#[cfg(feature = "sqlx-dep")]
+pub use sqlx_common::*;
 #[cfg(feature = "sqlx-mysql")]
 pub use sqlx_mysql::*;
 #[cfg(feature = "sqlx-sqlite")]

src/driver/sqlx_common.rs

@@ -0,0 +1,9 @@
+use crate::DbErr;
+
+pub fn sqlx_error_to_exec_err(err: sqlx::Error) -> DbErr {
+    DbErr::Exec(err.to_string())
+}
+
+pub fn sqlx_error_to_query_err(err: sqlx::Error) -> DbErr {
+    DbErr::Query(err.to_string())
+}

src/driver/sqlx_mysql.rs

@@ -8,6 +8,8 @@ use sea_query_driver_mysql::bind_query;
 
 use crate::{debug_print, error::*, executor::*, DatabaseConnection, Statement};
 
+use super::sqlx_common::*;
+
 pub struct SqlxMySqlConnector;
 
 pub struct SqlxMySqlPoolConnection {
@@ -25,7 +27,7 @@ impl SqlxMySqlConnector {
                 SqlxMySqlPoolConnection { pool },
             ))
         } else {
-            Err(DbErr::Conn)
+            Err(DbErr::Conn("Failed to connect.".to_owned()))
         }
     }
 }
@@ -42,11 +44,13 @@ impl SqlxMySqlPoolConnection {
 
         let query = sqlx_query(&stmt);
         if let Ok(conn) = &mut self.pool.acquire().await {
-            if let Ok(res) = query.execute(conn).await {
-                return Ok(res.into());
+            match query.execute(conn).await {
+                Ok(res) => Ok(res.into()),
+                Err(err) => Err(sqlx_error_to_exec_err(err)),
             }
+        } else {
+            Err(DbErr::Exec("Failed to acquire connection from pool.".to_owned()))
         }
-        Err(DbErr::Exec)
     }
 
     pub async fn query_one(&self, stmt: Statement) -> Result<Option<QueryResult>, DbErr> {
@@ -54,13 +58,15 @@ impl SqlxMySqlPoolConnection {
 
         let query = sqlx_query(&stmt);
         if let Ok(conn) = &mut self.pool.acquire().await {
-            if let Ok(row) = query.fetch_one(conn).await {
-                Ok(Some(row.into()))
-            } else {
-                Ok(None)
+            match query.fetch_one(conn).await {
+                Ok(row) => Ok(Some(row.into())),
+                Err(err) => match err {
+                    sqlx::Error::RowNotFound => Ok(None),
+                    _ => Err(DbErr::Query(err.to_string())),
+                },
             }
         } else {
-            Err(DbErr::Query)
+            Err(DbErr::Query("Failed to acquire connection from pool.".to_owned()))
         }
     }
 
@@ -69,11 +75,13 @@ impl SqlxMySqlPoolConnection {
 
         let query = sqlx_query(&stmt);
         if let Ok(conn) = &mut self.pool.acquire().await {
-            if let Ok(rows) = query.fetch_all(conn).await {
-                return Ok(rows.into_iter().map(|r| r.into()).collect());
+            match query.fetch_all(conn).await {
+                Ok(rows) => Ok(rows.into_iter().map(|r| r.into()).collect()),
+                Err(err) => Err(sqlx_error_to_query_err(err)),
             }
+        } else {
+            Err(DbErr::Query("Failed to acquire connection from pool.".to_owned()))
         }
-        Err(DbErr::Query)
     }
 }
 

src/driver/sqlx_sqlite.rs

@@ -8,6 +8,8 @@ use sea_query_driver_sqlite::bind_query;
 
 use crate::{debug_print, error::*, executor::*, DatabaseConnection, Statement};
 
+use super::sqlx_common::*;
+
 pub struct SqlxSqliteConnector;
 
 pub struct SqlxSqlitePoolConnection {
@@ -25,7 +27,7 @@ impl SqlxSqliteConnector {
                 SqlxSqlitePoolConnection { pool },
             ))
         } else {
-            Err(DbErr::Conn)
+            Err(DbErr::Conn("Failed to connect.".to_owned()))
         }
     }
 }
@@ -42,11 +44,13 @@ impl SqlxSqlitePoolConnection {
 
         let query = sqlx_query(&stmt);
         if let Ok(conn) = &mut self.pool.acquire().await {
-            if let Ok(res) = query.execute(conn).await {
-                return Ok(res.into());
+            match query.execute(conn).await {
+                Ok(res) => Ok(res.into()),
+                Err(err) => Err(sqlx_error_to_exec_err(err)),
             }
+        } else {
+            Err(DbErr::Exec("Failed to acquire connection from pool.".to_owned()))
         }
-        Err(DbErr::Exec)
     }
 
     pub async fn query_one(&self, stmt: Statement) -> Result<Option<QueryResult>, DbErr> {
@@ -54,13 +58,15 @@ impl SqlxSqlitePoolConnection {
 
         let query = sqlx_query(&stmt);
         if let Ok(conn) = &mut self.pool.acquire().await {
-            if let Ok(row) = query.fetch_one(conn).await {
-                Ok(Some(row.into()))
-            } else {
-                Ok(None)
+            match query.fetch_one(conn).await {
+                Ok(row) => Ok(Some(row.into())),
+                Err(err) => match err {
+                    sqlx::Error::RowNotFound => Ok(None),
+                    _ => Err(DbErr::Query(err.to_string())),
+                },
             }
         } else {
-            Err(DbErr::Query)
+            Err(DbErr::Query("Failed to acquire connection from pool.".to_owned()))
         }
     }
 
@@ -69,11 +75,13 @@ impl SqlxSqlitePoolConnection {
 
         let query = sqlx_query(&stmt);
         if let Ok(conn) = &mut self.pool.acquire().await {
-            if let Ok(rows) = query.fetch_all(conn).await {
-                return Ok(rows.into_iter().map(|r| r.into()).collect());
+            match query.fetch_all(conn).await {
+                Ok(rows) => Ok(rows.into_iter().map(|r| r.into()).collect()),
+                Err(err) => Err(sqlx_error_to_query_err(err)),
             }
+        } else {
+            Err(DbErr::Query("Failed to acquire connection from pool.".to_owned()))
         }
-        Err(DbErr::Query)
     }
 }
 

src/entity/active_model.rs

@@ -223,11 +223,11 @@ where
     // TODO: if the entity does not have auto increment primary key, then last_insert_id is a wrong value
     if <E::PrimaryKey as PrimaryKeyTrait>::auto_increment() && res.last_insert_id != 0 {
         let find = E::find_by_id(res.last_insert_id).one(db);
-        let res = find.await;
-        let model: Option<E::Model> = res?;
+        let found = find.await;
+        let model: Option<E::Model> = found?;
         match model {
             Some(model) => Ok(model.into_active_model()),
-            None => Err(DbErr::Exec),
+            None => Err(DbErr::Exec(format!("Failed to find inserted item: {} {}", E::default().to_string(), res.last_insert_id))),
         }
     } else {
         Ok(A::default())

src/error.rs

@@ -1,41 +1,16 @@
-use std::{error, fmt};
-
 #[derive(Debug)]
 pub enum DbErr {
-    Conn,
-    Exec,
-    Query,
-    #[cfg(feature = "sqlx-dep")]
-    Sqlx(sqlx::Error),
+    Conn(String),
+    Exec(String),
+    Query(String),
 }
 
-impl fmt::Display for DbErr {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+impl std::fmt::Display for DbErr {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
         match self {
-            Self::Conn => write!(f, "{:?}", "Connection Error"),
-            Self::Exec => write!(f, "{:?}", "Execution Error"),
-            Self::Query => write!(f, "{:?}", "Query Error"),
-            #[cfg(feature = "sqlx-dep")]
-            Self::Sqlx(e) => write!(f, "{:?}", e),
+            Self::Conn(s) => write!(f, "Connection Error: {}", s),
+            Self::Exec(s) => write!(f, "Execution Error: {}", s),
+            Self::Query(s) => write!(f, "Query Error: {}", s),
         }
     }
 }
-
-impl error::Error for DbErr {
-    fn source(&self) -> Option<&(dyn error::Error + 'static)> {
-        match self {
-            Self::Conn => None,
-            Self::Exec => None,
-            Self::Query => None,
-            #[cfg(feature = "sqlx-dep")]
-            Self::Sqlx(e) => Some(e),
-        }
-    }
-}
-
-#[cfg(feature = "sqlx-dep")]
-impl From<sqlx::Error> for DbErr {
-    fn from(sqlx_err: sqlx::Error) -> Self {
-        Self::Sqlx(sqlx_err)
-    }
-}

src/executor/query.rs

@@ -56,12 +56,12 @@ macro_rules! try_getable_all {
                     #[cfg(feature = "sqlx-mysql")]
                     QueryResultRow::SqlxMySql(row) => {
                         use sqlx::Row;
-                        Ok(row.try_get(column.as_str())?)
+                        row.try_get(column.as_str()).map_err(crate::sqlx_error_to_query_err)
                     }
                     #[cfg(feature = "sqlx-sqlite")]
                     QueryResultRow::SqlxSqlite(row) => {
                         use sqlx::Row;
-                        Ok(row.try_get(column.as_str())?)
+                        row.try_get(column.as_str()).map_err(crate::sqlx_error_to_query_err)
                     }
                     #[cfg(feature = "mock")]
                     QueryResultRow::Mock(row) => Ok(row.try_get(column.as_str())?),
@@ -109,7 +109,7 @@ macro_rules! try_getable_mysql {
                     #[cfg(feature = "sqlx-mysql")]
                     QueryResultRow::SqlxMySql(row) => {
                         use sqlx::Row;
-                        Ok(row.try_get(column.as_str())?)
+                        row.try_get(column.as_str()).map_err(crate::sqlx_error_to_query_err)
                     }
                     #[cfg(feature = "sqlx-sqlite")]
                     QueryResultRow::SqlxSqlite(_) => {