Refactored postgresql Db scripts

features/device-mgt/org.wso2.carbon.device.mgt.mobile.feature/src/main/resources/dbscripts/plugins/android/postgresql.sql

@@ -1,8 +1,7 @@
 -- -----------------------------------------------------
 -- Table AD_DEVICE
 -- -----------------------------------------------------
-DROP TABLE IF EXISTS AD_DEVICE;
-CREATE TABLE AD_DEVICE (
+CREATE TABLE IF NOT EXISTS AD_DEVICE (
   DEVICE_ID VARCHAR(45) NOT NULL ,
   DEVICE_INFO VARCHAR(500) NULL DEFAULT NULL,
   GCM_TOKEN VARCHAR(45) NULL DEFAULT NULL,
@@ -22,8 +21,7 @@ CREATE TABLE AD_DEVICE (
 -- -----------------------------------------------------
 -- Table AD_FEATURE
 -- -----------------------------------------------------
-DROP TABLE IF EXISTS AD_FEATURE;
-CREATE TABLE AD_FEATURE (
+CREATE TABLE IF NOT EXISTS AD_FEATURE (
   ID BIGSERIAL NOT NULL PRIMARY KEY,
   CODE VARCHAR(45) NOT NULL,
   NAME VARCHAR(100) NULL,

features/device-mgt/org.wso2.carbon.device.mgt.mobile.feature/src/main/resources/dbscripts/plugins/ios/postgresql.sql

@@ -1,8 +1,7 @@
 -- -----------------------------------------------------
 -- Table IOS_FEATURE
 -- -----------------------------------------------------
-DROP TABLE IF EXISTS IOS_FEATURE;
-CREATE TABLE IOS_FEATURE (
+CREATE TABLE IF NOT EXISTS IOS_FEATURE (
   ID SERIAL NOT NULL,
   CODE VARCHAR(45) NOT NULL,
   NAME VARCHAR(100) NULL,
@@ -13,8 +12,7 @@ CREATE TABLE IOS_FEATURE (
 -- -----------------------------------------------------
 -- Table IOS_DEVICE
 -- -----------------------------------------------------
-DROP TABLE IF EXISTS IOS_DEVICE;
-CREATE  TABLE IF NOT EXISTS IOS_DEVICE (
+CREATE TABLE IF NOT EXISTS IOS_DEVICE (
   DEVICE_ID VARCHAR(45) NOT NULL,
   APNS_PUSH_TOKEN VARCHAR(100) NULL DEFAULT NULL,
   MAGIC_TOKEN VARCHAR(100) NULL DEFAULT NULL,

features/device-mgt/org.wso2.carbon.device.mgt.mobile.feature/src/main/resources/dbscripts/plugins/windows/postgresql.sql

@@ -1,8 +1,7 @@
 -- -----------------------------------------------------
 -- Table WIN_DEVICE
 -- -----------------------------------------------------
-DROP TABLE IF EXISTS WIN_DEVICE;
-CREATE TABLE WIN_DEVICE (
+CREATE TABLE IF NOT EXISTS WIN_DEVICE (
   DEVICE_ID VARCHAR(45) NOT NULL,
   PUSH_TOKEN VARCHAR(45) NULL DEFAULT NULL,
   IMEI VARCHAR(45) NULL DEFAULT NULL,
@@ -22,8 +21,7 @@ CREATE TABLE WIN_DEVICE (
 -- -----------------------------------------------------
 -- Table WIN_FEATURE
 -- -----------------------------------------------------
-DROP TABLE IF EXISTS WIN_FEATURE;
-CREATE TABLE WIN_FEATURE (
+CREATE TABLE IF NOT EXISTS WIN_FEATURE (
   ID SERIAL NOT NULL,
   DEVICE_TYPE VARCHAR(45) NOT NULL,
   CODE VARCHAR(45) NULL,