修改

后端的都放着里面/zxborrow/src/main/java/domain/BrPO.java

@@ -2,7 +2,7 @@ package domain;
 
 import java.io.Serializable;
 public class BrPO implements Serializable{
-    private String S_id;
+    private String s_id;
     private String book_id;
     private String s_name;
     private String book_name;

后端的都放着里面/zxborrow/src/main/resources/generatorConfig.xml

@@ -19,12 +19,7 @@
 			userId="root"
 			password="zjh19990323">
 		</jdbcConnection>
-		<jdbcConnection 
+		
-			driverClass="com.mysql.jdbc.Driver"
-			connectionURL="jdbc:mysql://127.0.0.1:3306/zxzx" 
-			userId="root"
-			password="zjh19990323">
-		</jdbcConnection>
 
 		<javaTypeResolver>
 			<property name="forceBigDecimals" value="false" />