content: package com.alibaba.druid.bvt.sql.postgresql.issues;
  
  import com.alibaba.druid.DbType;
  import com.alibaba.druid.sql.SQLUtils;
  import com.alibaba.druid.sql.ast.SQLStatement;
  import com.alibaba.druid.sql.parser.SQLParserUtils;
  import com.alibaba.druid.sql.parser.SQLStatementParser;
  import com.alibaba.druid.sql.visitor.SchemaStatVisitor;
  import com.alibaba.druid.stat.TableStat;
  import org.junit.Test;
  
  import java.util.Map;
  
  import static org.junit.Assert.assertTrue;
  
  /**
   * 验证 Postgresql 无法解析 alter database 语句 #5444
   *
   * @author lizongbo
   * @see <a href="https://github.com/alibaba/druid/issues/5444">增强 #5444</a>
   */
  public class Issue5444 {
      @Test
      public void test_alterdatabase() throws Exception {
          for (DbType dbType : new DbType[]{DbType.postgresql}) {
              for (String sql : new String[]{
                  "alter database 'aaa' rename to ccc;",
                  "ALTER DATABASE test SET enable_indexscan = off;",
                  "ALTER DATABASE test SET enable_indexscan TO off;",
                  "alter database 'aaa' owner to ddd;",
                  "ALTER DATABASE test SET TABLESPACE new_tablespace;",
                  "ALTER DATABASE test REFRESH COLLATION VERSION;",
                  "ALTER DATABASE test RESET ALL;",
                  "ALTER DATABASE test RESET abcdd;",
              }) {
                  SQLStatementParser parser = SQLParserUtils.createSQLStatementParser(sql, dbType);
                  SQLStatement statement = parser.parseStatement();
                  System.out.println(dbType + "原始的sql===" + sql);
                  System.out.println(dbType + "生成的sql===" + statement);
                  SchemaStatVisitor visitor = SQLUtils.createSchemaStatVisitor(dbType);
                  statement.accept(visitor);
                  System.out.println(dbType + "getTables==" + visitor.getTables());
                  Map<TableStat.Name, TableStat> tableMap = visitor.getTables();
                  assertTrue(tableMap.isEmpty());
              }
  
          }
      }
  }
  