diff --git a/src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlLexer.java b/src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlLexer.java
index dd2f82a297..8a7046af26 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlLexer.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlLexer.java
@@ -357,9 +357,11 @@ public class MySqlLexer extends Lexer {
                     token = LITERAL_CHARS;
                     break;
                 } else {
-                    initBuff(bufPos);
-                    arraycopy(mark + 1, buf, 0, bufPos);
-                    hasSpecial = true;
+                    if (!hasSpecial) {
+                        initBuff(bufPos);
+                        arraycopy(mark + 1, buf, 0, bufPos);
+                        hasSpecial = true;
+                    }
                     putChar('\'');
                     continue;
                 }
@@ -378,7 +380,6 @@ public class MySqlLexer extends Lexer {
         }
 
         if (!hasSpecial) {
-            stringVal = "";
             stringVal = subString(mark + 1, bufPos);
         } else {
             stringVal = new String(buf, 0, bufPos);
diff --git a/src/test/java/com/alibaba/druid/bvt/bug/Issue_697.java b/src/test/java/com/alibaba/druid/bvt/bug/Issue_697.java
new file mode 100644
index 0000000000..96d7199bb1
--- /dev/null
+++ b/src/test/java/com/alibaba/druid/bvt/bug/Issue_697.java
@@ -0,0 +1,41 @@
+package com.alibaba.druid.bvt.bug;
+
+import java.util.List;
+
+import org.junit.Assert;
+import junit.framework.TestCase;
+
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.dialect.mysql.parser.MySqlStatementParser;
+import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlOutputVisitor;
+
+public class Issue_697 extends TestCase {
+
+    public void test_for_issue() throws Exception {
+        String sql = "insert into tag_rule_detail(id, gmt_create, gmt_modified, group_id, priority, rule_condition, rule_action) values(1010102, now(), now(), 10101, 0, 'flow=''trustLogin''', 'be:login,dev:pc, env:web, type:trust_login, from:$loginfrom, result:true') ;\n"
+                     + "insert into tag_rule_detail(id, gmt_create, gmt_modified, group_id, priority, rule_condition, rule_action) values(1010103, now(), now(), 10101, 0, 'flow=''Ctr''', 'be:login,dev:pc, env:web, type:ctr, from:$loginfrom, result:true') ;";
+
+        String expected = "INSERT INTO tag_rule_detail (id, gmt_create, gmt_modified, group_id, priority"
+                          + "\n\t, rule_condition, rule_action)"
+                          + "\nVALUES (1010102, now(), now(), 10101, 0"
+                          + "\n\t, 'flow=''trustLogin''', 'be:login,dev:pc, env:web, type:trust_login, from:$loginfrom, result:true');"
+                          + "\nINSERT INTO tag_rule_detail (id, gmt_create, gmt_modified, group_id, priority"
+                          + "\n\t, rule_condition, rule_action)"
+                          + "\nVALUES (1010103, now(), now(), 10101, 0"
+                          + "\n\t, 'flow=''Ctr''', 'be:login,dev:pc, env:web, type:ctr, from:$loginfrom, result:true');\n";
+
+        StringBuilder out = new StringBuilder();
+        MySqlOutputVisitor visitor = new MySqlOutputVisitor(out);
+        MySqlStatementParser parser = new MySqlStatementParser(sql);
+        List<SQLStatement> statementList = parser.parseStatementList();
+        for (SQLStatement statement : statementList) {
+            statement.accept(visitor);
+            visitor.print(";");
+            visitor.println();
+        }
+
+        System.out.println(out.toString());
+
+        Assert.assertEquals(expected, out.toString());
+    }
+}