improve parser ddl support

src/main/java/com/alibaba/druid/sql/ast/statement/SQLAlterTableDisableKeys.java

@@ -0,0 +1,31 @@
+/*
+ * 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.sql.ast.statement;
+
+import com.alibaba.druid.sql.ast.SQLObjectImpl;
+import com.alibaba.druid.sql.visitor.SQLASTVisitor;
+
+public class SQLAlterTableDisableKeys extends SQLObjectImpl implements SQLAlterTableItem {
+
+    private static final long serialVersionUID = 1L;
+
+    @Override
+    protected void accept0(SQLASTVisitor visitor) {
+        visitor.visit(this);
+        visitor.endVisit(this);
+    }
+
+}

src/main/java/com/alibaba/druid/sql/ast/statement/SQLAlterTableDropForeinKey.java

@@ -0,0 +1,44 @@
+/*
+ * 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.sql.ast.statement;
+
+import com.alibaba.druid.sql.ast.SQLName;
+import com.alibaba.druid.sql.ast.SQLObjectImpl;
+import com.alibaba.druid.sql.visitor.SQLASTVisitor;
+
+public class SQLAlterTableDropForeinKey extends SQLObjectImpl implements SQLAlterTableItem {
+
+    private static final long serialVersionUID = 1L;
+
+    private SQLName           indexName;
+
+    public SQLName getIndexName() {
+        return indexName;
+    }
+
+    public void setIndexName(SQLName indexName) {
+        this.indexName = indexName;
+    }
+
+    @Override
+    protected void accept0(SQLASTVisitor visitor) {
+        if (visitor.visit(this)) {
+            acceptChild(visitor, indexName);
+        }
+        visitor.endVisit(this);
+    }
+
+}

src/main/java/com/alibaba/druid/sql/ast/statement/SQLAlterTableDropPrimaryKey.java

@@ -0,0 +1,31 @@
+/*
+ * 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.sql.ast.statement;
+
+import com.alibaba.druid.sql.ast.SQLObjectImpl;
+import com.alibaba.druid.sql.visitor.SQLASTVisitor;
+
+public class SQLAlterTableDropPrimaryKey extends SQLObjectImpl implements SQLAlterTableItem {
+
+    private static final long serialVersionUID = 1L;
+
+    @Override
+    protected void accept0(SQLASTVisitor visitor) {
+        visitor.visit(this);
+        visitor.endVisit(this);
+    }
+
+}

src/main/java/com/alibaba/druid/sql/ast/statement/SQLAlterTableEnableKeys.java

@@ -0,0 +1,31 @@
+/*
+ * 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.sql.ast.statement;
+
+import com.alibaba.druid.sql.ast.SQLObjectImpl;
+import com.alibaba.druid.sql.visitor.SQLASTVisitor;
+
+public class SQLAlterTableEnableKeys extends SQLObjectImpl implements SQLAlterTableItem {
+
+    private static final long serialVersionUID = 1L;
+
+    @Override
+    protected void accept0(SQLASTVisitor visitor) {
+        visitor.visit(this);
+        visitor.endVisit(this);
+    }
+
+}

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

@@ -31,8 +31,12 @@ import com.alibaba.druid.sql.ast.expr.SQLQueryExpr;
 import com.alibaba.druid.sql.ast.expr.SQLVariantRefExpr;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableAddPrimaryKey;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableAlterColumn;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableDisableKeys;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableDropColumnItem;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableDropForeinKey;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableDropIndex;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableDropPrimaryKey;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableEnableKeys;
 import com.alibaba.druid.sql.ast.statement.SQLColumnDefinition;
 import com.alibaba.druid.sql.ast.statement.SQLCreateDatabaseStatement;
 import com.alibaba.druid.sql.ast.statement.SQLCreateTableStatement;
@@ -2284,6 +2288,18 @@ public class MySqlStatementParser extends SQLStatementParser {
                         SQLAlterTableDropIndex item = new SQLAlterTableDropIndex();
                         item.setIndexName(indexName);
                         stmt.getItems().add(item);
+                    } else if (lexer.token() == Token.FOREIGN) {
+                        lexer.nextToken();
+                        accept(Token.KEY);
+                        SQLName indexName = this.exprParser.name();
+                        SQLAlterTableDropForeinKey item = new SQLAlterTableDropForeinKey();
+                        item.setIndexName(indexName);
+                        stmt.getItems().add(item);
+                    } else if (lexer.token() == Token.PRIMARY) {
+                        lexer.nextToken();
+                        accept(Token.KEY);
+                        SQLAlterTableDropPrimaryKey item = new SQLAlterTableDropPrimaryKey();
+                        stmt.getItems().add(item);
                     } else {
                         if (identifierEquals("COLUMN")) {
                             lexer.nextToken();
@@ -2293,9 +2309,15 @@ public class MySqlStatementParser extends SQLStatementParser {
                         stmt.getItems().add(item);
                     }
                 } else if (identifierEquals("DISABLE")) {
-                    throw new ParserException("TODO " + lexer.token() + " " + lexer.stringVal());
+                    lexer.nextToken();
+                    acceptIdentifier("KEYS");
+                    SQLAlterTableDisableKeys item = new SQLAlterTableDisableKeys();
+                    stmt.getItems().add(item);
                 } else if (identifierEquals("ENABLE")) {
-                    throw new ParserException("TODO " + lexer.token() + " " + lexer.stringVal());
+                    lexer.nextToken();
+                    acceptIdentifier("KEYS");
+                    SQLAlterTableEnableKeys item = new SQLAlterTableEnableKeys();
+                    stmt.getItems().add(item);
                 } else if (identifierEquals("RENAME")) {
                     lexer.nextToken();
                     MySqlRenameTableStatement renameStmt = new MySqlRenameTableStatement();

src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlSchemaStatVisitor.java

@@ -22,7 +22,6 @@ import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableAddColumn;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableItem;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableStatement;
-import com.alibaba.druid.sql.ast.statement.SQLColumnDefinition;
 import com.alibaba.druid.sql.ast.statement.SQLCreateTableStatement;
 import com.alibaba.druid.sql.ast.statement.SQLDropTableStatement;
 import com.alibaba.druid.sql.ast.statement.SQLExprTableSource;

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

@@ -68,8 +68,12 @@ import com.alibaba.druid.sql.ast.statement.NotNullConstraint;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableAddColumn;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableAddPrimaryKey;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableAlterColumn;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableDisableKeys;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableDropColumnItem;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableDropForeinKey;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableDropIndex;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableDropPrimaryKey;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableEnableKeys;
 import com.alibaba.druid.sql.ast.statement.SQLAssignItem;
 import com.alibaba.druid.sql.ast.statement.SQLCallStatement;
 import com.alibaba.druid.sql.ast.statement.SQLCharactorDataType;
@@ -1375,4 +1379,29 @@ public class SQLASTOutputVisitor extends SQLASTVisitorAdapter {
         print(')');
         return false;
     }
+    
+    @Override
+    public boolean visit(SQLAlterTableDropForeinKey x) {
+        print("DROP FOREIGN KEY ");
+        x.getIndexName().accept(this);
+        return false;
+    }
+    
+    @Override
+    public boolean visit(SQLAlterTableDropPrimaryKey x) {
+        print("DROP PRIMARY KEY");
+        return false;
+    }
+    
+    @Override
+    public boolean visit(SQLAlterTableEnableKeys x) {
+        print("ENABLE KEYS");
+        return false;
+    }
+    
+    @Override
+    public boolean visit(SQLAlterTableDisableKeys x) {
+        print("DISABLE KEYS");
+        return false;
+    }
 }

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

@@ -56,8 +56,12 @@ import com.alibaba.druid.sql.ast.statement.NotNullConstraint;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableAddColumn;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableAddPrimaryKey;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableAlterColumn;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableDisableKeys;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableDropColumnItem;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableDropForeinKey;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableDropIndex;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableDropPrimaryKey;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableEnableKeys;
 import com.alibaba.druid.sql.ast.statement.SQLAssignItem;
 import com.alibaba.druid.sql.ast.statement.SQLCallStatement;
 import com.alibaba.druid.sql.ast.statement.SQLCharactorDataType;
@@ -429,4 +433,20 @@ public interface SQLASTVisitor {
     boolean visit(SQLCheck x);
 
     void endVisit(SQLCheck x);
+    
+    boolean visit(SQLAlterTableDropForeinKey x);
+
+    void endVisit(SQLAlterTableDropForeinKey x);
+    
+    boolean visit(SQLAlterTableDropPrimaryKey x);
+    
+    void endVisit(SQLAlterTableDropPrimaryKey x);
+    
+    boolean visit(SQLAlterTableDisableKeys x);
+    
+    void endVisit(SQLAlterTableDisableKeys x);
+    
+    boolean visit(SQLAlterTableEnableKeys x);
+    
+    void endVisit(SQLAlterTableEnableKeys x);
 }

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

@@ -56,8 +56,12 @@ import com.alibaba.druid.sql.ast.statement.NotNullConstraint;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableAddColumn;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableAddPrimaryKey;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableAlterColumn;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableDisableKeys;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableDropColumnItem;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableDropForeinKey;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableDropIndex;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableDropPrimaryKey;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableEnableKeys;
 import com.alibaba.druid.sql.ast.statement.SQLAssignItem;
 import com.alibaba.druid.sql.ast.statement.SQLCallStatement;
 import com.alibaba.druid.sql.ast.statement.SQLCharactorDataType;
@@ -787,4 +791,44 @@ public class SQLASTVisitorAdapter implements SQLASTVisitor {
     public void endVisit(SQLCheck x) {
         
     }
+
+    @Override
+    public boolean visit(SQLAlterTableDropForeinKey x) {
+        return true;
+    }
+
+    @Override
+    public void endVisit(SQLAlterTableDropForeinKey x) {
+        
+    }
+    
+    @Override
+    public boolean visit(SQLAlterTableDropPrimaryKey x) {
+        return true;
+    }
+    
+    @Override
+    public void endVisit(SQLAlterTableDropPrimaryKey x) {
+        
+    }
+
+    @Override
+    public boolean visit(SQLAlterTableDisableKeys x) {
+        return true;
+    }
+
+    @Override
+    public void endVisit(SQLAlterTableDisableKeys x) {
+        
+    }
+
+    @Override
+    public boolean visit(SQLAlterTableEnableKeys x) {
+        return true;
+    }
+
+    @Override
+    public void endVisit(SQLAlterTableEnableKeys x) {
+        
+    }
 }

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

@@ -39,6 +39,7 @@ import com.alibaba.druid.sql.ast.expr.SQLIntegerExpr;
 import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
 import com.alibaba.druid.sql.ast.expr.SQLPropertyExpr;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableAddColumn;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableDropForeinKey;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableStatement;
 import com.alibaba.druid.sql.ast.statement.SQLCallStatement;
 import com.alibaba.druid.sql.ast.statement.SQLColumnDefinition;
@@ -1025,4 +1026,9 @@ public class SchemaStatVisitor extends SQLASTVisitorAdapter {
         x.getSubQuery().accept(this);
         return false;
     }
+    
+    @Override
+    public boolean visit(SQLAlterTableDropForeinKey x) {
+        return false;
+    }
 }

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

@@ -0,0 +1,52 @@
+/*
+ * 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 junit.framework.Assert;
+import junit.framework.TestCase;
+
+import com.alibaba.druid.sql.SQLUtils;
+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;
+import com.alibaba.druid.sql.parser.Token;
+import com.alibaba.druid.stat.TableStat.Column;
+
+public class MySqlAlterTableDisableKeys extends TestCase {
+
+    public void test_alter_first() throws Exception {
+        String sql = "alter table tableName DISABLE KEYS";
+        MySqlStatementParser parser = new MySqlStatementParser(sql);
+        SQLStatement stmt = parser.parseStatementList().get(0);
+        parser.match(Token.EOF);
+
+        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());
+
+        String output = SQLUtils.toMySqlString(stmt);
+        Assert.assertEquals("ALTER TABLE tableName" + //
+                            "\n\tDISABLE KEYS", output);
+
+        Assert.assertEquals(1, visitor.getTables().size());
+        Assert.assertEquals(0, visitor.getColumns().size());
+    }
+
+}

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

@@ -0,0 +1,52 @@
+/*
+ * 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 junit.framework.Assert;
+import junit.framework.TestCase;
+
+import com.alibaba.druid.sql.SQLUtils;
+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;
+import com.alibaba.druid.sql.parser.Token;
+import com.alibaba.druid.stat.TableStat.Column;
+
+public class MySqlAlterTableDropPrimaryKey extends TestCase {
+
+    public void test_alter_first() throws Exception {
+        String sql = "alter table tableName DROP PRIMARY KEY";
+        MySqlStatementParser parser = new MySqlStatementParser(sql);
+        SQLStatement stmt = parser.parseStatementList().get(0);
+        parser.match(Token.EOF);
+
+        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());
+
+        String output = SQLUtils.toMySqlString(stmt);
+        Assert.assertEquals("ALTER TABLE tableName" + //
+                            "\n\tDROP PRIMARY KEY", output);
+
+        Assert.assertEquals(1, visitor.getTables().size());
+        Assert.assertEquals(0, visitor.getColumns().size());
+    }
+
+}

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

@@ -0,0 +1,52 @@
+/*
+ * 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 junit.framework.Assert;
+import junit.framework.TestCase;
+
+import com.alibaba.druid.sql.SQLUtils;
+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;
+import com.alibaba.druid.sql.parser.Token;
+import com.alibaba.druid.stat.TableStat.Column;
+
+public class MySqlAlterTableEnableKeys extends TestCase {
+
+    public void test_alter_first() throws Exception {
+        String sql = "alter table tableName ENABLE KEYS";
+        MySqlStatementParser parser = new MySqlStatementParser(sql);
+        SQLStatement stmt = parser.parseStatementList().get(0);
+        parser.match(Token.EOF);
+
+        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());
+
+        String output = SQLUtils.toMySqlString(stmt);
+        Assert.assertEquals("ALTER TABLE tableName" + //
+                            "\n\tENABLE KEYS", output);
+
+        Assert.assertEquals(1, visitor.getTables().size());
+        Assert.assertEquals(0, visitor.getColumns().size());
+    }
+
+}

src/test/java/com/alibaba/druid/bvt/sql/mysql/MySqlAlterTableTest6.java

@@ -0,0 +1,52 @@
+/*
+ * 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 junit.framework.Assert;
+import junit.framework.TestCase;
+
+import com.alibaba.druid.sql.SQLUtils;
+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;
+import com.alibaba.druid.sql.parser.Token;
+import com.alibaba.druid.stat.TableStat.Column;
+
+public class MySqlAlterTableTest6 extends TestCase {
+
+    public void test_alter_first() throws Exception {
+        String sql = "alter table tableName DROP FOREIGN KEY fk_symbol";
+        MySqlStatementParser parser = new MySqlStatementParser(sql);
+        SQLStatement stmt = parser.parseStatementList().get(0);
+        parser.match(Token.EOF);
+
+        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());
+
+        String output = SQLUtils.toMySqlString(stmt);
+        Assert.assertEquals("ALTER TABLE tableName" + //
+                            "\n\tDROP FOREIGN KEY fk_symbol", output);
+
+        Assert.assertEquals(1, visitor.getTables().size());
+        Assert.assertEquals(0, visitor.getColumns().size());
+    }
+
+}

src/test/java/com/alibaba/druid/bvt/sql/mysql/MySqlAlterTableTest7.java

@@ -0,0 +1,52 @@
+/*
+ * 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 junit.framework.Assert;
+import junit.framework.TestCase;
+
+import com.alibaba.druid.sql.SQLUtils;
+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;
+import com.alibaba.druid.sql.parser.Token;
+import com.alibaba.druid.stat.TableStat.Column;
+
+public class MySqlAlterTableTest7 extends TestCase {
+
+    public void test_alter_first() throws Exception {
+        String sql = "ALTER TABLE t1 ENGINE = InnoDB;";
+        MySqlStatementParser parser = new MySqlStatementParser(sql);
+        SQLStatement stmt = parser.parseStatementList().get(0);
+        parser.match(Token.EOF);
+
+        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());
+
+        String output = SQLUtils.toMySqlString(stmt);
+        Assert.assertEquals("ALTER TABLE t1" + //
+                            "\n\tENGINE = InnoDB", output);
+
+        Assert.assertEquals(1, visitor.getTables().size());
+        Assert.assertEquals(0, visitor.getColumns().size());
+    }
+
+}

src/test/java/com/alibaba/druid/bvt/sql/mysql/MySqlAlterTableTest8.java

@@ -0,0 +1,52 @@
+/*
+ * 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 junit.framework.Assert;
+import junit.framework.TestCase;
+
+import com.alibaba.druid.sql.SQLUtils;
+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;
+import com.alibaba.druid.sql.parser.Token;
+import com.alibaba.druid.stat.TableStat.Column;
+
+public class MySqlAlterTableTest8 extends TestCase {
+
+    public void test_alter_first() throws Exception {
+        String sql = "ALTER TABLE t2 AUTO_INCREMENT = 3";
+        MySqlStatementParser parser = new MySqlStatementParser(sql);
+        SQLStatement stmt = parser.parseStatementList().get(0);
+        parser.match(Token.EOF);
+
+        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());
+
+        String output = SQLUtils.toMySqlString(stmt);
+        Assert.assertEquals("ALTER TABLE t1" + //
+                            "\n\tENGINE = InnoDB", output);
+
+        Assert.assertEquals(1, visitor.getTables().size());
+        Assert.assertEquals(0, visitor.getColumns().size());
+    }
+
+}