解决驼峰转下划线的错误，感谢 piggsoft 和 liufor 的PR

abel533 · abel533 · commit a2f4698579f8 · 2016-08-29T22:23:53.000+08:00
diff --git a/src/main/java/tk/mybatis/mapper/util/StringUtil.java b/src/main/java/tk/mybatis/mapper/util/StringUtil.java
@@ -92,9 +92,9 @@ public static String camelhumpToUnderline(String str) {
         for (int i = 0; i < size; i++) {
             c = chars[i];
             if (isUppercaseAlpha(c)) {
-                sb.append('_').append(c);
+                sb.append('_').append(toLowerAscii(c));
             } else {
-                sb.append(toUpperAscii(c));
+                sb.append(c);
             }
         }
         return sb.charAt(0) == '_' ? sb.substring(1) : sb.toString();
diff --git a/src/test/java/tk/mybatis/mapper/helper/CamelCaseTest.java b/src/test/java/tk/mybatis/mapper/helper/CamelCaseTest.java
@@ -0,0 +1,20 @@
+package tk.mybatis.mapper.helper;
+
+import org.junit.Assert;
+import org.junit.Test;
+import tk.mybatis.mapper.util.StringUtil;
+
+/**
+ * @author liuzh_3nofxnp
+ * @since 2016-08-29 22:02
+ */
+public class CamelCaseTest {
+
+    @Test
+    public void testCamelhumpToUnderline() {
+        Assert.assertEquals("user_id", StringUtil.camelhumpToUnderline("userId"));
+        Assert.assertEquals("sys_user", StringUtil.camelhumpToUnderline("sysUser"));
+        Assert.assertEquals("sys_user_role", StringUtil.camelhumpToUnderline("sysUserRole"));
+        Assert.assertEquals("s_function", StringUtil.camelhumpToUnderline("sFunction"));
+    }
+}

Original file line number	Diff line number	Diff line change
`@@ -92,9 +92,9 @@ public static String camelhumpToUnderline(String str) {`
`92`	`92`	`for (int i = 0; i < size; i++) {`
`93`	`93`	`c = chars[i];`
`94`	`94`	`if (isUppercaseAlpha(c)) {`
`95`		`- sb.append('_').append(c);`
	`95`	`+ sb.append('_').append(toLowerAscii(c));`
`96`	`96`	`} else {`
`97`		`- sb.append(toUpperAscii(c));`
	`97`	`+ sb.append(c);`
`98`	`98`	`}`
`99`	`99`	`}`
`100`	`100`	`return sb.charAt(0) == '_' ? sb.substring(1) : sb.toString();`