Khushal/Gurpreet: Added support for Flyway DB migration tool into MifosX. Added a call for it in TomatJDBCDataSourcePerTenantService so that it gets called per tenant once.

mifosng-provider/build.gradle

@@ -156,6 +156,7 @@ dependencies {
 	            [group: 'com.lowagie', name: 'itext', version: '2.1.7'],
 	            [group: 'com.lowagie', name: 'itext-rtf', version: '2.1.7'],
 				[group: 'org.mnode.ical4j', name: 'ical4j', version: '1.0.4'],
+                [group: 'com.googlecode.flyway', name: 'flyway-maven-plugin', version: '2.1.1']
  	        )
  	        
  	 testCompile 'junit:junit:4.10', 

mifosng-provider/src/main/java/org/mifosplatform/database/DBMigrationHelper.java

@@ -0,0 +1,29 @@
+package org.mifosplatform.database;
+import com.googlecode.flyway.core.Flyway;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+import javax.sql.DataSource;
+
+/**
+ * Use Flyway library to migrate DB schema. Searches for .sql files in the migrate folder.
+ * For more details on this refer to:
+ * http://flywaydb.org/documentation/migration/sql.html
+ */
+public class DBMigrationHelper {
+
+//    private static final String DB_CONNECTION_URL = "jdbc:mysql://localhost:3306/mifostenant-default";
+//    private static final String DB_USER = "root";
+//    private static final String DB_PASSWORD = "mysql";
+
+    protected final Log logger = LogFactory.getLog(getClass());
+
+    public void migrateDB(DataSource tenantDataSource){
+
+       logger.info("Checking for DB Schema Migration. Tenant: "+ tenantDataSource);
+
+       Flyway flyway = new Flyway();
+       flyway.setDataSource(tenantDataSource);
+       flyway.migrate();
+   }
+}

mifosng-provider/src/main/java/org/mifosplatform/infrastructure/core/service/TomcatJdbcDataSourcePerTenantService.java

@@ -12,6 +12,7 @@ import javax.sql.DataSource;
 
 import org.apache.tomcat.jdbc.pool.PoolConfiguration;
 import org.apache.tomcat.jdbc.pool.PoolProperties;
+import org.mifosplatform.database.DBMigrationHelper;
 import org.mifosplatform.infrastructure.core.domain.MifosPlatformTenant;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Qualifier;
@@ -51,6 +52,7 @@ public class TomcatJdbcDataSourcePerTenantService implements DataSourcePerTenant
             } else {
                 tenantDataSource = createNewDataSourceFor(tenant);
                 this.tenantToDataSourceMap.put(tenant.getId(), tenantDataSource);
+                new DBMigrationHelper().migrateDB(tenantDataSource);
             }
         }