*: WIP-fix issue 234.

parser/parser.y

@@ -344,6 +344,7 @@ import (
 	DeleteFromStmt		"DELETE FROM statement"
 	DistinctOpt		"Distinct option"
 	DoStmt			"Do statement"
+	DropDatabase		"DROP {DATABASE | SCHEMA}"
 	DropDatabaseStmt	"DROP DATABASE statement"
 	DropIndexStmt		"DROP INDEX statement"
 	DropTableStmt		"DROP TABLE statement"
@@ -1134,6 +1135,7 @@ DefaultOpt:
 DefaultKwdOpt:
 	{}
 |	"DEFAULT"
+
 /******************************************************************
  * Do statement
  * See: https://dev.mysql.com/doc/refman/5.7/en/do.html
@@ -1218,11 +1220,18 @@ DeleteFromStmt:
 		}
 	}
 	
+DropDatabase:
+	"DROP" "DATABASE"
+	{
+	}
+|	"DROP" "SCHEMA"
+	{
+	}
 
 DropDatabaseStmt:
-	"DROP" "DATABASE" IfExists Identifier
+	DropDatabase IfExists DBName
 	{
-		$$ = &stmts.DropDatabaseStmt{IfExists: $3.(bool), Name: $4.(string)}
+		$$ = &stmts.DropDatabaseStmt{IfExists: $2.(bool), Name: $3.(string)}
 		if yylex.(*lexer).root {
 			break
 		}

parser/parser_test.go

@@ -350,6 +350,20 @@ func (s *testParserSuite) TestParser0(c *C) {
 		{"show collation", true},
 		{"show collation like 'utf8%'", true},
 		{"show collation where Charset = 'utf8' and Collation = 'utf8_bin'", true},
+
+		// For drop datbase/schema
+		{"create database xxx", true},
+		{"create database if exists xxx", false},
+		{"create database if not exists xxx", true},
+		{"create schema xxx", true},
+		{"create schema if exists xxx", false},
+		{"create schema if not exists xxx", true},
+		{"drop database xxx", true},
+		{"drop database if exists xxx", true},
+		{"drop database if not exists xxx", false},
+		{"drop schema xxx", true},
+		{"drop schema if exists xxx", true},
+		{"drop schema if not exists xxx", false},
 	}
 
 	for _, t := range table {

tidb_test.go

@@ -859,6 +859,19 @@ func (s *testSessionSuite) TestBootstrap(c *C) {
 	mustExecSQL(c, se, "USE test;")
 }
 
+func (s *testSessionSuite) TestDatabase(c *C) {
+	store := newStore(c, s.dbName)
+	se := newSession(c, store, s.dbName)
+
+	mustExecSQL(c, se, "create database xxx")
+	mustExecSQL(c, se, "use xxx")
+	mustExecSQL(c, se, "drop database xxx")
+
+	mustExecSQL(c, se, "create schema xxx")
+	mustExecSQL(c, se, "use xxx")
+	mustExecSQL(c, se, "drop schema xxx")
+}
+
 func newSession(c *C, store kv.Storage, dbName string) Session {
 	se, err := CreateSession(store)
 	c.Assert(err, IsNil)