Add SAP HANA support (#1511)

src/main/resources/io/ebeaninternal/dbmigration/builtin-extra-ddl.xml

@@ -159,4 +159,39 @@ BEGIN
 END
 $$
 </ddl-script>
+
+<ddl-script name="create procs" platforms="hana" init="true">-- Inital script to create stored procedures etc for the hana platform
+delimiter $$
+--
+-- PROCEDURE: usp_ebean_drop_foreign_keys TABLE, COLUMN
+-- deletes all constraints and foreign keys referring to TABLE.COLUMN
+--
+CREATE OR REPLACE PROCEDURE usp_ebean_drop_foreign_keys(IN table_name NVARCHAR(256), IN column_name NVARCHAR(256))
+AS
+BEGIN
+  DECLARE foreign_key_names TABLE(CONSTRAINT_NAME NVARCHAR(256), TABLE_NAME NVARCHAR(256));
+  DECLARE i INT;
+  
+  foreign_key_names = SELECT CONSTRAINT_NAME, TABLE_NAME FROM SYS.REFERENTIAL_CONSTRAINTS WHERE SCHEMA_NAME=CURRENT_SCHEMA AND TABLE_NAME=UPPER(:table_name) AND COLUMN_NAME=UPPER(:column_name);
+  
+  FOR I IN 1 .. RECORD_COUNT(:foreign_key_names) DO
+    EXEC 'ALTER TABLE "' || ESCAPE_DOUBLE_QUOTES(:foreign_key_names.TABLE_NAME[i]) || '" DROP CONSTRAINT "' || ESCAPE_DOUBLE_QUOTES(:foreign_key_names.CONSTRAINT_NAME[i]) || '"';
+  END FOR;
+  
+END;
+$$
+
+delimiter $$
+--
+-- PROCEDURE: usp_ebean_drop_column TABLE, COLUMN
+-- deletes the column and ensures that all indices and constraints are dropped first
+--
+CREATE OR REPLACE PROCEDURE usp_ebean_drop_column(IN table_name NVARCHAR(256), IN column_name NVARCHAR(256))
+AS
+BEGIN
+  CALL usp_ebean_drop_foreign_keys(table_name, column_name);
+  EXEC 'ALTER TABLE "' || UPPER(ESCAPE_DOUBLE_QUOTES(table_name)) || '" DROP ("' || UPPER(ESCAPE_DOUBLE_QUOTES(column_name)) || '")';
+END;
+$$
+</ddl-script>
 </extra-ddl>