improve sql parser

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

@@ -0,0 +1,47 @@
+/*
+ * 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 SQLAlterTableEnableConstraint extends SQLObjectImpl implements SQLAlterTableItem {
+
+    private static final long serialVersionUID = 1L;
+
+    private SQLName           constraintName;
+
+    @Override
+    protected void accept0(SQLASTVisitor visitor) {
+        if (visitor.visit(this)) {
+            acceptChild(visitor, this.constraintName);
+        }
+        visitor.endVisit(this);
+    }
+
+    
+    public SQLName getConstraintName() {
+        return constraintName;
+    }
+
+    
+    public void setConstraintName(SQLName constraintName) {
+        this.constraintName = constraintName;
+    }
+
+    
+}

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

@@ -38,6 +38,7 @@ 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.SQLAlterTableEnableConstraint;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableEnableKeys;
 import com.alibaba.druid.sql.ast.statement.SQLColumnDefinition;
 import com.alibaba.druid.sql.ast.statement.SQLCreateDatabaseStatement;
@@ -2382,9 +2383,16 @@ public class MySqlStatementParser extends SQLStatementParser {
                     }
                 } else if (identifierEquals("ENABLE")) {
                     lexer.nextToken();
-                    acceptIdentifier("KEYS");
-                    SQLAlterTableEnableKeys item = new SQLAlterTableEnableKeys();
-                    stmt.getItems().add(item);
+                    if (lexer.token() == Token.CONSTRAINT) {
+                        lexer.nextToken();
+                        SQLAlterTableEnableConstraint item = new SQLAlterTableEnableConstraint();
+                        item.setConstraintName(this.exprParser.name());
+                        stmt.getItems().add(item);
+                    } else {
+                        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/visitor/SQLASTOutputVisitor.java

@@ -75,6 +75,7 @@ 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.SQLAlterTableEnableConstraint;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableEnableKeys;
 import com.alibaba.druid.sql.ast.statement.SQLAssignItem;
 import com.alibaba.druid.sql.ast.statement.SQLCallStatement;
@@ -1430,4 +1431,10 @@ public class SQLASTOutputVisitor extends SQLASTVisitorAdapter {
         x.getConstraintName().accept(this);
         return false;
     }
+    
+    public boolean visit(SQLAlterTableEnableConstraint x) {
+        print("ENABLE CONSTRAINT ");
+        x.getConstraintName().accept(this);
+        return false;
+    }
 }

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

@@ -63,6 +63,7 @@ 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.SQLAlterTableEnableConstraint;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableEnableKeys;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableStatement;
 import com.alibaba.druid.sql.ast.statement.SQLAssignItem;
@@ -464,4 +465,8 @@ public interface SQLASTVisitor {
     boolean visit(SQLAlterTableDisableConstraint x);
     
     void endVisit(SQLAlterTableDisableConstraint x);
+    
+    boolean visit(SQLAlterTableEnableConstraint x);
+    
+    void endVisit(SQLAlterTableEnableConstraint x);
 }

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

@@ -63,6 +63,7 @@ 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.SQLAlterTableEnableConstraint;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableEnableKeys;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableStatement;
 import com.alibaba.druid.sql.ast.statement.SQLAssignItem;
@@ -864,4 +865,14 @@ public class SQLASTVisitorAdapter implements SQLASTVisitor {
     public void endVisit(SQLAlterTableDisableConstraint x) {
         
     }
+    
+    @Override
+    public boolean visit(SQLAlterTableEnableConstraint x) {
+        return true;
+    }
+    
+    @Override
+    public void endVisit(SQLAlterTableEnableConstraint x) {
+        
+    }
 }

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

@@ -41,6 +41,7 @@ import com.alibaba.druid.sql.ast.expr.SQLPropertyExpr;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableAddColumn;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableDisableConstraint;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableDropForeinKey;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableEnableConstraint;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableStatement;
 import com.alibaba.druid.sql.ast.statement.SQLCallStatement;
 import com.alibaba.druid.sql.ast.statement.SQLColumnDefinition;
@@ -1052,4 +1053,9 @@ public class SchemaStatVisitor extends SQLASTVisitorAdapter {
     public boolean visit(SQLAlterTableDisableConstraint x) {
         return false;
     }
+    
+    @Override
+    public boolean visit(SQLAlterTableEnableConstraint x) {
+        return false;
+    }
 }

src/test/java/com/alibaba/druid/bvt/sql/mysql/MySqlAlterTableTest16.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.TestCase;
+
+import org.junit.Assert;
+
+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;
+
+public class MySqlAlterTableTest16 extends TestCase {
+
+    public void test_alter_first() throws Exception {
+        String sql = "alter table st_jklsxxb enable constraint FK_ST_xxx_REFERENCE_ST_xxx";
+        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 st_jklsxxb" + //
+                            "\n\tENABLE CONSTRAINT FK_ST_xxx_REFERENCE_ST_xxx", output);
+
+        Assert.assertEquals(1, visitor.getTables().size());
+        Assert.assertEquals(0, visitor.getColumns().size());
+    }
+
+}