Implement MS SQL option to skip creating schemas, fix #263.

Allow the user to control whether pgloader should create the same set of
schema as found on the MS SQL database.

pgloader.1

@@ -1,7 +1,7 @@
 .\" generated with Ronn/v0.7.3
 .\" http://github.com/rtomayko/ronn/tree/0.7.3
 .
-.TH "PGLOADER" "1" "July 2015" "ff" ""
+.TH "PGLOADER" "1" "August 2015" "ff" ""
 .
 .SH "NAME"
 \fBpgloader\fR \- PostgreSQL data loader
@@ -2516,7 +2516,22 @@ Connection string to an existing MS SQL database server that listens and welcome
 \fIWITH\fR
 .
 .IP
-When loading from a \fBMS SQL\fR database, the same options as when loading a \fBMySQL\fR database are supported\. Please refer to the MySQL section\.
+When loading from a \fBMS SQL\fR database, the same options as when loading a \fBMySQL\fR database are supported\. Please refer to the MySQL section\. The following options are added:
+.
+.IP "\(bu" 4
+\fIcreate schemas\fR
+.
+.IP
+When this option is listed, pgloader creates the same schemas as found on the MS SQL instance\. This is the default\.
+.
+.IP "\(bu" 4
+\fIcreate no schemas\fR
+.
+.IP
+When this option is listed, pgloader refrains from creating any schemas at all, you must then ensure that the target schema do exist\.
+.
+.IP "" 0
+
 .
 .IP "\(bu" 4
 \fICAST\fR

pgloader.1.md

@@ -2054,7 +2054,19 @@ The `mssql` command accepts the following clauses and options:
   - *WITH*
 
     When loading from a `MS SQL` database, the same options as when loading
-    a `MySQL` database are supported. Please refer to the MySQL section.
+    a `MySQL` database are supported. Please refer to the MySQL section. The
+    following options are added:
+
+      - *create schemas*
+
+        When this option is listed, pgloader creates the same schemas as
+        found on the MS SQL instance. This is the default.
+
+      - *create no schemas*
+
+        When this option is listed, pgloader refrains from creating any
+        schemas at all, you must then ensure that the target schema do
+        exist.
 
   - *CAST*
 

src/parsers/command-keywords.lisp

@@ -96,6 +96,7 @@
   (def-keyword-rule "delimiter")
   ;; option for MySQL imports
   (def-keyword-rule "schema")
+  (def-keyword-rule "schemas")
   (def-keyword-rule "only")
   (def-keyword-rule "drop")
   (def-keyword-rule "create")

src/parsers/command-mssql.lisp

@@ -12,6 +12,36 @@
 ;;;
 ;;;  http://msdn.microsoft.com/en-us/library/ms187489(SQL.90).aspx
 ;;;
+(make-option-rule create-tables    (and kw-create (? kw-no) kw-schemas))
+
+(defrule mssql-option (or option-batch-rows
+                          option-batch-size
+                          option-batch-concurrency
+                          option-truncate
+                          option-disable-triggers
+                          option-data-only
+                          option-schema-only
+                          option-include-drop
+                          option-create-tables
+                          option-create-schemas
+                          option-create-indexes
+                          option-reset-sequences
+                          option-encoding))
+
+(defrule another-mssql-option (and comma mssql-option)
+  (:lambda (source)
+    (bind (((_ option) source)) option)))
+
+(defrule mssql-option-list (and mssql-option (* another-mssql-option))
+  (:lambda (source)
+    (destructuring-bind (opt1 opts) source
+      (alexandria:alist-plist (list* opt1 opts)))))
+
+(defrule mssql-options (and kw-with mssql-option-list)
+  (:lambda (source)
+    (bind (((_ opts) source))
+      (cons :mssql-options opts))))
+
 (defrule like-expression (and "'" (+ (not "'")) "'")
   (:lambda (le)
     (bind (((_ like _) le)) (text like))))
@@ -53,7 +83,7 @@
 ;;;
 ;;; Allow clauses to appear in any order
 ;;;
-(defrule load-mssql-optional-clauses (* (or mysql-options
+(defrule load-mssql-optional-clauses (* (or mssql-options
                                             gucs
                                             casts
                                             before-load
@@ -156,7 +186,7 @@
     (bind (((ms-db-uri pg-db-uri
                        &key
                        gucs casts before after including excluding
-                       ((:mysql-options options)))
+                       ((:mssql-options options)))
             source))
       (lisp-code-for-loading-from-mssql ms-db-uri pg-db-uri
                                         :gucs gucs

src/sources/mssql/mssql.lisp

@@ -180,6 +180,7 @@
 			    (data-only        nil)
 			    (schema-only      nil)
 			    (create-tables    t)
+			    (create-schemas   t)
 			    (include-drop     t)
 			    (create-indexes   t)
 			    (reset-sequences  t)
@@ -226,9 +227,10 @@
                      (loop :for (schema . tables) :in all-columns
                         :do (let ((schema (apply-identifier-case schema)))
                               ;; create schema
-                              (let ((sql (format nil "CREATE SCHEMA ~a;" schema)))
-                                (log-message :notice "~a" sql)
-                                (pgsql-execute sql))
+                              (when create-schemas
+                                (let ((sql (format nil "CREATE SCHEMA ~a;" schema)))
+                                  (log-message :notice "~a" sql)
+                                  (pgsql-execute sql)))
 
                               ;; set search_path to only that schema
                               (pgsql-execute