fix(db2/formatError): added support for reporting stack that triggere…

…d the query

lib/dialects/db2/query.js

@@ -22,7 +22,7 @@ class Query extends AbstractQuery {
     return value;
   }
 
-  async _run(connection, sql, parameters) {	
+  async _run(connection, sql, parameters) {
     this.sql = sql;
     const benchmark = this.sequelize.options.benchmark || this.options.benchmark;
     let queryBegin;
@@ -31,40 +31,42 @@ class Query extends AbstractQuery {
     } else {
       this.sequelize.log(`Executing (${ this.connection.uuid || 'default' }): ${ this.sql}`, this.options);
     }
+
+    const errStack = new Error().stack;
     return new Promise((resolve, reject) => {
       // TRANSACTION SUPPORT
       if (_.startsWith(this.sql, 'BEGIN TRANSACTION')) {
         connection.beginTransaction(err => {
           if (err) {
-            reject(this.formatError(err));
+            reject(this.formatError(err, errStack));
           } else {
             resolve(this.formatResults());
           }
         });
       } else if (_.startsWith(this.sql, 'COMMIT TRANSACTION')) {
         connection.commitTransaction(err => {
           if (err) {
-            reject(this.formatError(err));
+            reject(this.formatError(err, errStack));
           } else {
             resolve(this.formatResults());
           }
         });
       } else if (_.startsWith(this.sql, 'ROLLBACK TRANSACTION')) {
         connection.rollbackTransaction(err => {
           if (err) {
-            reject(this.formatError(err));
+            reject(this.formatError(err, errStack));
           } else {
             resolve(this.formatResults());
           }
         });
       } else if (_.startsWith(this.sql, 'SAVE TRANSACTION')) {
         connection.commitTransaction(err => {
           if (err) {
-            reject(this.formatError(err));
+            reject(this.formatError(err, errStack));
           } else {
             connection.beginTransaction(err => {
               if (err) {
-                reject(this.formatError(err));
+                reject(this.formatError(err, errStack));
               } else {
                 resolve(this.formatResults());
               }
@@ -90,7 +92,7 @@ class Query extends AbstractQuery {
         }
 
         connection.prepare(newSql, (err, stmt) => {
-          if (err) { reject(this.formatError(err)); }
+          if (err) { reject(this.formatError(err, errStack)); }
           stmt.execute(params, (err, result, outparams) => {
             debug(`executed(${this.connection.uuid || 'default'}):${newSql} ${parameters ? JSON.stringify(parameters) : ''}`);
 
@@ -108,7 +110,7 @@ class Query extends AbstractQuery {
             if (err) {
               err.sql = sql;
               stmt.closeSync();
-              reject(this.formatError(err, connection, parameters));
+              reject(this.formatError(err, errStack, connection, parameters));
             } else {
               let data = [];
               let metadata = [];
@@ -333,7 +335,7 @@ class Query extends AbstractQuery {
     });
   }
 
-  formatError(err, conn, parameters) {
+  formatError(err, errStack, conn, parameters) {
     let match;
 
     if (!(err && err.message)) {
@@ -389,7 +391,7 @@ class Query extends AbstractQuery {
         ));
       });
 
-      return new sequelizeErrors.UniqueConstraintError({ message, errors, parent: err, fields });
+      return new sequelizeErrors.UniqueConstraintError({ message, errors, parent: err, fields, stack: errStack });
     }
 
     match = err.message.match(/SQL0532N {2}A parent row cannot be deleted because the relationship "(.*)" restricts the deletion/) ||
@@ -399,7 +401,8 @@ class Query extends AbstractQuery {
       return new sequelizeErrors.ForeignKeyConstraintError({
         fields: null,
         index: match[1],
-        parent: err
+        parent: err,
+        stack: errStack
       });
     }
 
@@ -413,11 +416,12 @@ class Query extends AbstractQuery {
         message: match[0],
         constraint,
         table,
-        parent: err
+        parent: err,
+        stack: errStack
       });
     }
 
-    return new sequelizeErrors.DatabaseError(err);
+    return new sequelizeErrors.DatabaseError(err, { stack: errStack });
   }
 
 
@@ -446,7 +450,7 @@ class Query extends AbstractQuery {
     result = result || this.sql.startsWith('SELECT NAME AS "name", TBNAME AS "tableName", UNIQUERULE AS "keyType", COLNAMES, INDEXTYPE AS "type" FROM SYSIBM.SYSINDEXES');
     return result;
   }
-  
+
   handleShowIndexesQuery(data) {
     let currItem;
     const result = [];
@@ -460,7 +464,7 @@ class Query extends AbstractQuery {
           unique: item.keyType === 'U',
           type: item.type
         };
-        
+
         _.forEach(item.COLNAMES.replace(/\+|-/g, x => { return ` ${ x}`; }).split(' '), column => {
           let columnName = column.trim();
           if ( columnName ) {
@@ -476,7 +480,7 @@ class Query extends AbstractQuery {
         result.push(currItem);
       }
     });
-    return result;    
+    return result;
   }
 
   handleInsertQuery(results, metaData) {