SQLASTOutputVisitor support exportTables.

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

@@ -47,6 +47,9 @@ public class SQLASTOutputVisitor extends SQLASTVisitorAdapter implements Paramet
     protected boolean groupItemSingleLine = false;
 
     protected List<Object> parameters;
+    protected Set<String> tables;
+
+    protected boolean exportTables = false;
 
     protected String dbType;
 
@@ -108,6 +111,10 @@ public class SQLASTOutputVisitor extends SQLASTVisitorAdapter implements Paramet
         return parameters;
     }
 
+    public Set<String> getTables() {
+        return this.tables;
+    }
+
     public void setParameters(List<Object> parameters) {
         this.parameters = parameters;
     }
@@ -152,6 +159,14 @@ public class SQLASTOutputVisitor extends SQLASTVisitorAdapter implements Paramet
         this.parameterizedMergeInList = parameterizedMergeInList;
     }
 
+    public boolean isExportTables() {
+        return exportTables;
+    }
+
+    public void setExportTables(boolean exportTables) {
+        this.exportTables = exportTables;
+    }
+
     public void print(char value) {
         if (this.appender == null) {
             return;
@@ -1066,9 +1081,21 @@ public class SQLASTOutputVisitor extends SQLASTVisitorAdapter implements Paramet
         return false;
     }
 
+    protected void addTable(String table) {
+        if (tables == null) {
+            tables = new HashSet<String>();
+        }
+        this.tables.add(table);
+    }
+
     protected void printTableSourceExpr(SQLExpr expr) {
+        if (exportTables) {
+            addTable(expr.toString());
+        }
+
         if (tableMapping != null && expr instanceof SQLName) {
             String tableName = expr.toString();
+
             String destTableName = tableMapping.get(tableName);
             if (destTableName != null) {
                 tableName = destTableName;

src/test/java/com/alibaba/druid/bvt/sql/mysql/select/MySqlSelectTest_exportTables.java

@@ -0,0 +1,67 @@
+/*
+ * 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.select;
+
+import com.alibaba.druid.sql.MysqlTest;
+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.visitor.SQLASTOutputVisitor;
+import com.alibaba.druid.util.JdbcConstants;
+import org.junit.Assert;
+
+import java.util.List;
+
+public class MySqlSelectTest_exportTables extends MysqlTest {
+
+    public void test_0() throws Exception {
+        String sql = "select *\n" +
+                "from my_table\n" +
+                "where level between 10-5 and 10+5\n" +
+                "order by -ABS(10 - level) desc\n" +
+                "limit 0,100";
+
+        
+        MySqlStatementParser parser = new MySqlStatementParser(sql);
+        List<SQLStatement> statementList = parser.parseStatementList();
+        SQLStatement stmt = statementList.get(0);
+//        print(statementList);
+
+        assertEquals(1, statementList.size());
+
+        StringBuffer out = new StringBuffer();
+        SQLASTOutputVisitor visitor = SQLUtils.createOutputVisitor(out, JdbcConstants.MYSQL);
+        visitor.setExportTables(true);
+
+        stmt.accept(visitor);
+
+
+        assertEquals("SELECT *\n" +
+                        "FROM my_table\n" +
+                        "WHERE level BETWEEN 10 - 5 AND 10 + 5\n" +
+                        "ORDER BY -ABS(10 - level) DESC\n" +
+                        "LIMIT 0, 100", //
+                            out.toString());
+
+        assertNotNull(visitor.getTables());
+        assertEquals(1, visitor.getTables().size());
+        assertTrue(visitor.getTables().contains("my_table"));
+    }
+    
+    
+    
+}