Fixed error in database script

Author: 何惠民

src/main/java/cn/com/hellowood/dynamicdatasource/configuration/TargetDataSource.java

@@ -1,4 +1,4 @@
-DROP DATABASE product_master IF EXISTS;
+DROP DATABASE IF EXISTS product_master;
 CREATE DATABASE product_master;
 CREATE TABLE product_master.product(
   id INT PRIMARY KEY AUTO_INCREMENT,
@@ -8,7 +8,7 @@ CREATE TABLE product_master.product(
 INSERT INTO product_master.product (name, price) VALUES('master', '1');
 
 
-DROP DATABASE product_slave_alpha IF EXISTS;
+DROP DATABASE IF EXISTS product_slave_alpha;
 CREATE DATABASE product_slave_alpha;
 CREATE TABLE product_slave_alpha.product(
   id INT PRIMARY KEY AUTO_INCREMENT,
@@ -17,7 +17,7 @@ CREATE TABLE product_slave_alpha.product(
 );
 INSERT INTO product_slave_alpha.product (name, price) VALUES('slaveAlpha', '1');
 
-DROP DATABASE product_slave_beta IF EXISTS;
+DROP DATABASE IF EXISTS product_slave_beta;
 CREATE DATABASE product_slave_beta;
 CREATE TABLE product_slave_beta.product(
   id INT PRIMARY KEY AUTO_INCREMENT,
@@ -26,7 +26,7 @@ CREATE TABLE product_slave_beta.product(
 );
 INSERT INTO product_slave_beta.product (name, price) VALUES('slaveBeta', '1');
 
-DROP DATABASE product_slave_gamma IF EXISTS;
+DROP DATABASE IF EXISTS product_slave_gamma;
 CREATE DATABASE product_slave_gamma;
 CREATE TABLE product_slave_gamma.product(
   id INT PRIMARY KEY AUTO_INCREMENT,