替换一下常量

mybatis-plus-core/src/main/java/com/baomidou/mybatisplus/core/conditions/AbstractWrapper.java

@@ -54,6 +54,7 @@ import com.baomidou.mybatisplus.core.conditions.segments.MergeSegments;
 import com.baomidou.mybatisplus.core.enums.SqlKeyword;
 import com.baomidou.mybatisplus.core.toolkit.ArrayUtils;
 import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;
+import com.baomidou.mybatisplus.core.toolkit.Constants;
 import com.baomidou.mybatisplus.core.toolkit.StringUtils;
 
 
@@ -73,7 +74,7 @@ public abstract class AbstractWrapper<T, R, This extends AbstractWrapper<T, R, T
      * 前缀
      */
     private static final String MP_GENERAL_PARAMNAME = "MPGENVAL";
-    private static final String DEFAULT_PARAM_ALIAS = "ew";
+    private static final String DEFAULT_PARAM_ALIAS = Constants.WRAPPER;
     /**
      * 占位符
      */

mybatis-plus-core/src/main/java/com/baomidou/mybatisplus/core/toolkit/StringUtils.java

@@ -282,11 +282,12 @@ public class StringUtils {
      * 字符串拼接
      * </p>
      *
-     * @param strings 需要拼接的字符串
+     * @param delimiter 中间的分隔符
+     * @param strings   需要拼接的字符串
      * @return 拼接后的字符串
      */
-    public static String appends(String... strings) {
-        return Arrays.stream(strings).collect(joining(""));
+    public static String appends(String delimiter, String... strings) {
+        return Arrays.stream(strings).collect(joining(delimiter == null ? "" : delimiter));
     }
 
     /**
@@ -851,6 +852,6 @@ public class StringUtils {
      */
     public static String removeWordWithComma(String s, String p) {
         String match = "\\s*" + p + "\\s*,{0,1}";
-        return s.replaceAll(match,"");
+        return s.replaceAll(match, "");
     }
 }