Fix migration script for SQLServer

Issue #4349

Author: fmbenhassine

spring-batch-core/src/main/resources/org/springframework/batch/core/migration/5.0/migration-sqlserver.sql

@@ -4,10 +4,18 @@ ALTER TABLE BATCH_JOB_EXECUTION_CONTEXT ALTER COLUMN SERIALIZED_CONTEXT VARCHAR(
 ALTER TABLE BATCH_STEP_EXECUTION ADD CREATE_TIME DATETIME NOT NULL DEFAULT '1970-01-01 00:00:00';
 ALTER TABLE BATCH_STEP_EXECUTION ALTER COLUMN START_TIME DATETIME NULL;
 
-ALTER TABLE BATCH_JOB_EXECUTION_PARAMS DROP COLUMN DATE_VAL;
+-- Note: DATE_VAL cannot be dropped in a single statement as it has a DEFAULT NULL constraint
+-- and there are several ways of dropping it depending on the version of SQLServer.
+-- Dropping DATE_VAL is omitted from this script and left to the user.
+-- ALTER TABLE BATCH_JOB_EXECUTION_PARAMS DROP COLUMN DATE_VAL;
 ALTER TABLE BATCH_JOB_EXECUTION_PARAMS DROP COLUMN LONG_VAL;
 ALTER TABLE BATCH_JOB_EXECUTION_PARAMS DROP COLUMN DOUBLE_VAL;
 
-ALTER TABLE BATCH_JOB_EXECUTION_PARAMS MODIFY COLUMN TYPE_CD PARAMETER_TYPE VARCHAR(100);
-ALTER TABLE BATCH_JOB_EXECUTION_PARAMS MODIFY COLUMN KEY_NAME PARAMETER_NAME VARCHAR(100);
-ALTER TABLE BATCH_JOB_EXECUTION_PARAMS MODIFY COLUMN STRING_VAL PARAMETER_VALUE VARCHAR(2500);
+EXEC SP_RENAME 'BATCH_JOB_EXECUTION_PARAMS.TYPE_CD', 'PARAMETER_TYPE', 'COLUMN';
+ALTER TABLE BATCH_JOB_EXECUTION_PARAMS ALTER COLUMN PARAMETER_TYPE VARCHAR(100);
+
+EXEC SP_RENAME 'BATCH_JOB_EXECUTION_PARAMS.KEY_NAME', 'PARAMETER_NAME', 'COLUMN';
+ALTER TABLE BATCH_JOB_EXECUTION_PARAMS ALTER COLUMN PARAMETER_NAME VARCHAR(100);
+
+EXEC SP_RENAME 'BATCH_JOB_EXECUTION_PARAMS.STRING_VAL', 'PARAMETER_VALUE', 'COLUMN';
+ALTER TABLE BATCH_JOB_EXECUTION_PARAMS ALTER COLUMN PARAMETER_VALUE VARCHAR(2500);