feat: ODBC statement preparation

This commit refines the ODBC command execution process by introducing a dedicated `prepare` method in the `ConnectionWorker`, allowing for better management of SQL statement preparation and metadata retrieval. It also simplifies the command processing logic and improves the handling of SQL execution results. Additionally, new tests have been added to validate the functionality of prepared statements and error handling for parameter counts.

Author: lovasoa

sqlx-core/src/odbc/connection/executor.rs

@@ -60,11 +60,11 @@ impl<'c> Executor<'c> for &'c mut OdbcConnection {
         'c: 'e,
     {
         Box::pin(async move {
-            // Basic statement metadata: no parameter/column info without executing
+            let (_, columns, parameters) = self.worker.prepare(sql).await?;
             Ok(OdbcStatement {
                 sql: Cow::Borrowed(sql),
-                columns: Vec::new(),
-                parameters: 0,
+                columns,
+                parameters,
             })
         })
     }