Fixes #166 by handling exceptions when logging

CHANGELOG.md

@@ -3,8 +3,8 @@
 Only accretive/fixative changes will be made from now on.
 
 * 1.2.next in progress
-  * _[Experimental! Will change in response to feedback!]_ Add `next.jdbc/with-logging` to create a wrapped connectable that will invoke logging functions with the SQL/parameters and optionally the result for each operation.
   * Fix #167 by adding `:property-separator` to `next.jdbc.connection/dbtypes` and using it in `jdbc-url`.
+  * Address #166 by adding `next.jdbc/with-logging` to create a wrapped connectable that will invoke logging functions with the SQL/parameters and optionally the result or exception for each operation.
   * Fix `:unit_count` references in **Getting Started** (were `:unit_cost`).
   * Update `test-runner`.
 

doc/getting-started.md

@@ -592,7 +592,9 @@ operations directly so they do not produce results). `my-result-logger` will be
 three arguments:
 * The fully-qualified symbol identify the operation,
 * A "state" argument (the result of calling `my-sql-logger`),
-* The result set data structure.
+* The result set data structure, if the call succeeded, or the exception if it failed.
+
+The return value of the result logger function is ignored.
 
 The symbol will be one of: `next.jdbc/execute!` or `next.jdbc/execute-one!`. The friendly
 SQL functions invoke `execute!` or `execute-one!` under the hood, so that is how they will
@@ -605,7 +607,8 @@ returns `nil`, that will be passed as the second argument to your second logging
 
 The result set data structure could be arbitrarily large. It will generally be a vector
 for calls to `execute!` or a hash map for calls to `execute-one!`, but its shape is determined
-by any `:builder-fn` options in effect.
+by any `:builder-fn` options in effect. You should check if `(instance? Throwable result)`
+to see if the call failed and the logger has been called with the thrown exception.
 
 For `plan` and `prepare` calls, only the first logging function is invoked (and the return
 value is ignored). You can use the symbol passed in to determine this.

src/next/jdbc.clj

@@ -390,10 +390,10 @@
 
   The result logging function, if provided, will be called with the
   same symbol passed to the sql/params logging function, the `state`
-  returned by the sql/params logging function, and the result of the
+  returned by the sql/params logging function, and either the result of
-  `execute!` or `execute-one!` call. The result logging function is
+  the `execute!` or `execute-one!` call or an exception if the call
-  not called for the `plan` or `prepare` call (since they do not produce
+  failed. The result logging function is not called for the `plan`
-  result sets directly).
+  or `prepare` call (since they do not produce result sets directly).
 
   Bear in mind that `get-datasource`, `get-connection`, and `with-transaction`
   return plain Java objects, so if you call any of those on this wrapped

src/next/jdbc/sql_logging.clj

@@ -32,14 +32,22 @@
                         (merge (:options this) opts)))
   (-execute-one [this sql-params opts]
                 (let [state ((:sql-logger this) 'next.jdbc/execute-one! sql-params)]
+                  (try
                     (doto (p/-execute-one (:connectable this) sql-params
                                           (merge (:options this) opts))
-                    (result-logger-helper this 'next.jdbc/execute-one! state))))
+                      (result-logger-helper this 'next.jdbc/execute-one! state))
+                    (catch Throwable t
+                      (result-logger-helper t this 'next.jdbc/execut-one! state)
+                      (throw t)))))
   (-execute-all [this sql-params opts]
                 (let [state ((:sql-logger this) 'next.jdbc/execute! sql-params)]
+                  (try
                     (doto (p/-execute-all (:connectable this) sql-params
                                           (merge (:options this) opts))
-                    (result-logger-helper this 'next.jdbc/execute! state)))))
+                      (result-logger-helper this 'next.jdbc/execute! state))
+                    (catch Throwable t
+                      (result-logger-helper t this 'next.jdbc/execut-one! state)
+                      (throw t))))))
 
 (extend-protocol p/Preparable
   SQLLogging