fix bug

mybatis-multi-tenancy/src/main/java/com/iformall/plugin/shard/plugin/ShardingSpherePlugin.java

@@ -222,16 +222,20 @@ public class ShardingSpherePlugin implements MyBatisPlus {
     	if (null == column) {
     		throw new RuntimeException("table sharinding error column is null");
     	}
-    	String[] field = column.split("_");
-		String fieldName = "";
-		if (null != field && field.length > 0) {
-			for (String f : field) {
-				fieldName = fieldName + f.substring(0,1).toUpperCase()+f.substring(1);
+    	try {
+	    	String[] field = column.split("_");
+			String fieldName = "";
+			if (null != field && field.length > 0) {
+				for (String f : field) {
+					fieldName = fieldName + f.substring(0,1).toUpperCase()+f.substring(1);
+				}
+			}else {
+				fieldName = column.substring(0,1).toUpperCase()+column.substring(1);
 			}
-		}else {
-			fieldName = column.substring(0,1).toUpperCase()+column.substring(1);
-		}
-		return fieldName;
+			return fieldName;
+    	}catch(Exception e) {
+    		throw new RuntimeException(e);
+    	}
     }
     
     private boolean isBasicTypeValue(Object parameterObject) {