support select ... from update .. for alibaba mysql

src/test/java/com/alibaba/druid/bvt/sql/mysql/MySqlSelectTest_update.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright 1999-2101 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.bvt.sql.mysql;
+
+import java.util.List;
+
+import org.junit.Assert;
+
+import com.alibaba.druid.sql.MysqlTest;
+import com.alibaba.druid.sql.SQLUtils;
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.ast.statement.SQLSelect;
+import com.alibaba.druid.sql.ast.statement.SQLSelectStatement;
+import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock;
+import com.alibaba.druid.sql.dialect.mysql.parser.MySqlStatementParser;
+import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlSchemaStatVisitor;
+
+public class MySqlSelectTest_update extends MysqlTest {
+
+    public void test_0() throws Exception {
+        String sql = "select current_no from "
+                     + "update wlb_waybill_branch_rule  set current_no = current_no + ? ,gmt_modified = now()   "
+                     + "where id = ? and status = ? and end_no > current_no " 
+                     + "order by current_no desc "
+                     + "limit 10";
+
+        MySqlStatementParser parser = new MySqlStatementParser(sql);
+        List<SQLStatement> statementList = parser.parseStatementList();
+        SQLStatement stmt = statementList.get(0);
+
+        SQLSelectStatement selectStmt = (SQLSelectStatement) stmt;
+
+        SQLSelect select = selectStmt.getSelect();
+        Assert.assertNotNull(select.getQuery());
+        MySqlSelectQueryBlock queryBlock = (MySqlSelectQueryBlock) select.getQuery();
+        Assert.assertNull(queryBlock.getOrderBy());
+
+        print(statementList);
+
+        Assert.assertEquals(1, statementList.size());
+        
+        String output = SQLUtils.toMySqlString(stmt);
+        
+        String expected = "SELECT current_no"
+                + "\nFROM UPDATE wlb_waybill_branch_rule"
+                + "\nSET current_no = current_no + ?, gmt_modified = now()"
+                + "\nWHERE id = ?"
+                + "\n\tAND status = ?"
+                + "\n\tAND end_no > current_no"
+                + "\nORDER BY current_no DESC"
+                + "\nLIMIT 10";
+
+        Assert.assertEquals(expected, output);
+
+        MySqlSchemaStatVisitor visitor = new MySqlSchemaStatVisitor();
+        stmt.accept(visitor);
+
+        System.out.println("Tables : " + visitor.getTables());
+        System.out.println("fields : " + visitor.getColumns());
+        System.out.println("coditions : " + visitor.getConditions());
+        System.out.println("orderBy : " + visitor.getOrderByColumns());
+
+        Assert.assertEquals(1, visitor.getTables().size());
+        Assert.assertEquals(5, visitor.getColumns().size());
+        Assert.assertEquals(4, visitor.getConditions().size());
+        Assert.assertEquals(0, visitor.getOrderByColumns().size());
+    }
+}