Merge pull request #286 from wenshao/master

bug fixed for sql parser

src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlSelectParser.java

@@ -261,7 +261,7 @@ public class MySqlSelectParser extends SQLSelectParser {
             return tableSource;
         }
 
-        if (identifierEquals("USE")) {
+        if (lexer.token() == Token.USE) {
             lexer.nextToken();
             MySqlUseIndexHint hint = new MySqlUseIndexHint();
             parseIndexHint(hint);

src/main/java/com/alibaba/druid/sql/parser/Keywords.java

@@ -113,6 +113,7 @@ public class Keywords {
         
         map.put("OVER", Token.OVER);
         map.put("TO", Token.TO);
+        map.put("USE", Token.USE);
 
         DEFAULT_KEYWORDS = new Keywords(map);
     }

src/main/java/com/alibaba/druid/sql/visitor/SchemaStatVisitor.java

@@ -62,6 +62,7 @@ import com.alibaba.druid.sql.ast.statement.SQLSubqueryTableSource;
 import com.alibaba.druid.sql.ast.statement.SQLTableElement;
 import com.alibaba.druid.sql.ast.statement.SQLTruncateStatement;
 import com.alibaba.druid.sql.ast.statement.SQLUpdateStatement;
+import com.alibaba.druid.sql.ast.statement.SQLUseStatement;
 import com.alibaba.druid.stat.TableStat;
 import com.alibaba.druid.stat.TableStat.Column;
 import com.alibaba.druid.stat.TableStat.Condition;
@@ -1040,4 +1041,9 @@ public class SchemaStatVisitor extends SQLASTVisitorAdapter {
     public boolean visit(SQLAlterTableDropForeinKey x) {
         return false;
     }
+    
+    @Override
+    public boolean visit(SQLUseStatement x) {
+        return false;
+    }
 }

src/test/java/com/alibaba/druid/bvt/sql/mysql/MySqlUseTest_0.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 1999-2011 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.ast.SQLStatement;
+import com.alibaba.druid.sql.dialect.mysql.parser.MySqlStatementParser;
+import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlSchemaStatVisitor;
+
+public class MySqlUseTest_0 extends MysqlTest {
+
+    public void test_0() throws Exception {
+        String sql = "use db;";
+
+        MySqlStatementParser parser = new MySqlStatementParser(sql);
+        List<SQLStatement> statementList = parser.parseStatementList();
+        SQLStatement stmt = statementList.get(0);
+
+        print(statementList);
+
+        Assert.assertEquals(1, statementList.size());
+
+        MySqlSchemaStatVisitor visitor = new MySqlSchemaStatVisitor();
+        stmt.accept(visitor);
+
+        Assert.assertEquals(0, visitor.getTables().size());
+        Assert.assertEquals(0, visitor.getColumns().size());
+        Assert.assertEquals(0, visitor.getConditions().size());
+        Assert.assertEquals(0, visitor.getOrderByColumns().size());
+
+        // Assert.assertTrue(visitor.getTables().containsKey(new TableStat.Name("mytable")));
+    }
+}