content: /*
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   ~ The MIT License (MIT)                                                         ~
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  */
  package org.miaixz.bus.shade.screw.dialect.oracle;
  
  import java.sql.PreparedStatement;
  import java.sql.ResultSet;
  import java.sql.SQLException;
  import java.util.List;
  import java.util.stream.Collectors;
  
  import javax.sql.DataSource;
  
  import org.miaixz.bus.core.lang.Assert;
  import org.miaixz.bus.core.lang.exception.InternalException;
  import org.miaixz.bus.core.xyz.CollKit;
  import org.miaixz.bus.shade.screw.Builder;
  import org.miaixz.bus.shade.screw.dialect.AbstractDatabaseQuery;
  import org.miaixz.bus.shade.screw.mapping.Mapping;
  import org.miaixz.bus.shade.screw.metadata.Column;
  import org.miaixz.bus.shade.screw.metadata.Database;
  import org.miaixz.bus.shade.screw.metadata.PrimaryKey;
  
  /**
   * Oracle 数据库查询
   * <p>
   * 还是采用从驱动中拿到数据的方式，这里注意一点，一定要加入配置参数remarks为true 否则表和列等说明不会查询出来 hikari： config.addDataSourceProperty("remarks", "true");
   * <p>
   * 不过这种查询性能很慢
   * https://docs.oracle.com/en/database/oracle/oracle-database/20/jjdbc/performance-extensions.html#GUID-15865071-39F2-430F-9EDA-EB34D0B2D560
   * 所以，只能够通过自定义SQL来了
   *
   * @author Kimi Liu
   * @since Java 17+
   */
  public class OracleDataBaseQuery extends AbstractDatabaseQuery {
  
      /**
       * 构造函数
       *
       * @param dataSource {@link DataSource}
       */
      public OracleDataBaseQuery(DataSource dataSource) {
          super(dataSource);
      }
  
      /**
       * 获取数据库
       *
       * @return {@link Database} 数据库信息
       */
      @Override
      public Database getDataBase() throws InternalException {
          OracleDatabase model = new OracleDatabase();
          // 当前数据库名称
          model.setDatabase(getSchema());
          return model;
      }
  
      /**
       * 获取表信息
       *
       * @return {@link List} 所有表信息
       */
      @Override
      public List<OracleTable> getTables() throws InternalException {
          ResultSet resultSet = null;
          try {
              // 查询
              resultSet = getMetaData()
                      .getTables(getCatalog(), getSchema(), Builder.PERCENT_SIGN, new String[] { "TABLE" });
              // 映射
              List<OracleTable> list = Mapping.convertList(resultSet, OracleTable.class);
              // 由于ORACLE 查询 REMARKS 非常耗费性能，所以这里使用自定义SQL查询
              // https://docs.oracle.com/en/database/oracle/oracle-database/20/jjdbc/performance-extensions.html#GUID-15865071-39F2-430F-9EDA-EB34D0B2D560
              // 获取所有表 查询表名、说明
              String sql = "SELECT TABLE_NAME,COMMENTS AS REMARKS FROM USER_TAB_COMMENTS WHERE TABLE_TYPE = 'TABLE'";
              if (isDda()) {
                  // DBA 使用 DBA_TAB_COMMENTS 进行查询 Oracle连接用户和schema不同问题。dba连接用户可以生成不同schema下的表结构
                  sql = "SELECT TABLE_NAME,COMMENTS AS REMARKS FROM DBA_TAB_COMMENTS WHERE TABLE_TYPE = 'TABLE' AND OWNER = '"
                          + getSchema() + "'";
              }
              resultSet = prepareStatement(String.format(sql, getSchema())).executeQuery();
              List<OracleTable> inquires = Mapping.convertList(resultSet, OracleTable.class);
              // 处理备注信息
              list.forEach((OracleTable model) -> {
                  // 备注
                  inquires.stream().filter(inquire -> model.getTableName().equals(inquire.getTableName()))
                          .forEachOrdered(inquire -> model.setRemarks(inquire.getRemarks()));
              });
              return list;
          } catch (SQLException e) {
              throw new InternalException(e);
          } finally {
              close(resultSet, this.connection);
          }
      }
  
      /**
       * 获取列信息
       *
       * @param table {@link String} 表名
       * @return {@link List} 表字段信息
       */
      @Override
      public List<OracleColumn> getTableColumns(String table) throws InternalException {
          Assert.notEmpty(table, "Table name can not be empty!");
          ResultSet resultSet = null;
          try {
              // 查询
              resultSet = getMetaData().getColumns(getCatalog(), getSchema(), table, Builder.PERCENT_SIGN);
              // 映射
              List<OracleColumn> list = Mapping.convertList(resultSet, OracleColumn.class);
              // 由于ORACLE 查询 COLUMNS REMARKS 为NULL，所以这里使用自定义SQL查询
              // https://docs.oracle.com/en/database/oracle/oracle-database/20/jjdbc/performance-extensions.html#GUID-15865071-39F2-430F-9EDA-EB34D0B2D560
              List<String> tableNames = list.stream().map(OracleColumn::getTableName).collect(Collectors.toList())
                      .stream().distinct().collect(Collectors.toList());
              if (CollKit.isEmpty(columnsCaching)) {
                  // 查询全部
                  if (table.equals(Builder.PERCENT_SIGN)) {
                      String sql = "SELECT ut.TABLE_NAME,  ut.COLUMN_NAME, uc.comments as REMARKS, concat(concat(concat(ut.DATA_TYPE, '('), ut.DATA_LENGTH), ')') AS COLUMN_TYPE, ut.DATA_LENGTH as COLUMN_LENGTH FROM user_tab_columns ut INNER JOIN user_col_comments uc ON ut.TABLE_NAME = uc.table_name AND ut.COLUMN_NAME = uc.column_name";
                      if (isDda()) {
                          sql = "SELECT ut.TABLE_NAME,  ut.COLUMN_NAME, uc.comments as REMARKS, concat(concat(concat(ut.DATA_TYPE, '('), ut.DATA_LENGTH), ')') AS COLUMN_TYPE, ut.DATA_LENGTH as COLUMN_LENGTH FROM dba_tab_columns ut INNER JOIN dba_col_comments uc ON ut.TABLE_NAME = uc.table_name AND ut.COLUMN_NAME = uc.column_name and ut.OWNER = uc.OWNER WHERE ut.OWNER = '"
                                  + getDataBase() + "'";
                      }
                      PreparedStatement statement = prepareStatement(sql);
                      resultSet = statement.executeQuery();
                      int fetchSize = 4284;
                      if (resultSet.getFetchSize() < fetchSize) {
                          resultSet.setFetchSize(fetchSize);
                      }
                  }
                  // 单表查询
                  else {
                      String sql = "SELECT ut.TABLE_NAME,  ut.COLUMN_NAME, uc.comments as REMARKS, concat(concat(concat(ut.DATA_TYPE, '('), ut.DATA_LENGTH), ')') AS COLUMN_TYPE, ut.DATA_LENGTH as COLUMN_LENGTH FROM user_tab_columns ut INNER JOIN user_col_comments uc ON ut.TABLE_NAME = uc.table_name AND ut.COLUMN_NAME = uc.column_name WHERE ut.Table_Name = '%s'";
                      if (isDda()) {
                          sql = "SELECT ut.TABLE_NAME,  ut.COLUMN_NAME, uc.comments as REMARKS, concat(concat(concat(ut.DATA_TYPE, '('), ut.DATA_LENGTH), ')') AS COLUMN_TYPE, ut.DATA_LENGTH as COLUMN_LENGTH FROM dba_tab_columns ut INNER JOIN dba_col_comments uc ON ut.TABLE_NAME = uc.table_name AND ut.COLUMN_NAME = uc.column_name and ut.OWNER = uc.OWNER WHERE ut.Table_Name = '%s' ut.OWNER = '"
                                  + getDataBase() + "'";
                      }
                      resultSet = prepareStatement(String.format(sql, table)).executeQuery();
                  }
                  List<OracleColumn> inquires = Mapping.convertList(resultSet, OracleColumn.class);
                  // 处理列，表名为key，列名为值
                  tableNames.forEach(
                          name -> columnsCaching.put(
                                  name,
                                  inquires.stream().filter(i -> i.getTableName().equals(name))
                                          .collect(Collectors.toList())));
              }
              // 处理备注信息
              // 从缓存中根据表名获取列信息
              for (OracleColumn i : list) {
                  List<Column> columns = columnsCaching.get(i.getTableName());
                  columns.forEach(j -> {
                      // 列名表名一致
                      if (i.getColumnName().equals(j.getColumnName()) && i.getTableName().equals(j.getTableName())) {
                          // 放入备注
                          i.setRemarks(j.getRemarks());
                          i.setColumnLength(j.getColumnLength());
                          i.setColumnType(j.getColumnType());
                      }
                  });
              }
              return list;
          } catch (SQLException e) {
              throw new InternalException(e);
          } finally {
              close(resultSet, this.connection);
          }
      }
  
      /**
       * 获取所有列信息
       *
       * @return {@link List} 表字段信息
       * @throws InternalException 异常
       */
      @Override
      public List<? extends Column> getTableColumns() throws InternalException {
          return getTableColumns(Builder.PERCENT_SIGN);
      }
  
      /**
       * 根据表名获取主键
       *
       * @param table {@link String}
       * @return {@link List}
       * @throws InternalException 异常
       */
      @Override
      public List<? extends PrimaryKey> getPrimaryKeys(String table) throws InternalException {
          ResultSet resultSet = null;
          try {
              // 查询
              resultSet = getMetaData().getPrimaryKeys(getCatalog(), getSchema(), table);
              // 映射
              return Mapping.convertList(resultSet, OraclePrimaryKey.class);
          } catch (SQLException e) {
              throw new InternalException(e);
          } finally {
              close(resultSet, this.connection);
          }
      }
  
      /**
       * 根据表名获取主键
       *
       * @return {@link List}
       * @throws InternalException 异常
       */
      @Override
      public List<? extends PrimaryKey> getPrimaryKeys() throws InternalException {
          ResultSet resultSet = null;
          try {
              // 由于单条循环查询存在性能问题，所以这里通过自定义SQL查询数据库主键信息
              String sql = "SELECT NULL AS TABLE_CAT, C.OWNER AS TABLE_SCHEM, C.TABLE_NAME, C.COLUMN_NAME, C.POSITION AS KEY_SEQ, C.CONSTRAINT_NAME AS PK_NAME FROM ALL_CONS_COLUMNS C, ALL_CONSTRAINTS K WHERE K.CONSTRAINT_TYPE = 'P' AND K.OWNER LIKE '%s' ESCAPE '/' AND K.CONSTRAINT_NAME = C.CONSTRAINT_NAME AND K.TABLE_NAME = C.TABLE_NAME AND K.OWNER = C.OWNER ORDER BY COLUMN_NAME ";
              // 拼接参数
              resultSet = prepareStatement(String.format(sql, getDataBase().getDatabase())).executeQuery();
              return Mapping.convertList(resultSet, OraclePrimaryKey.class);
          } catch (SQLException e) {
              throw new InternalException(e);
          } finally {
              close(resultSet);
          }
      }
  
      /**
       * 当前用户是否为DBA
       *
       * @return {@link Boolean}
       */
      private boolean isDda() {
          ResultSet resultSet = null;
          try {
              // 判断是否是DBA
              resultSet = prepareStatement("SELECT USERENV('isdba') as IS_DBA FROM DUAL").executeQuery();
              String dbaColumn = "IS_DBA";
              resultSet.next();
              return resultSet.getBoolean(dbaColumn);
          } catch (SQLException e) {
              throw new InternalException(e);
          } finally {
              close(resultSet);
          }
      }
  
  }
  