Java判断Sql server中数据库 数据表是否存在

判断数据库是否存在:

        // 判断数据库是否存在
		String sql = "select * From master.dbo.sysdatabases where name='数据库'";
		// get connection
		Connection conn = SqlUtils.getConnection();
		Statement statement = null;
		ResultSet resultSet = null;
		try {
			// get statement
			statement = conn.createStatement();
			// run sql
			resultSet = statement.executeQuery(sql);
			// 如果结果集有值则有库 否则无库-进行创建数据库操作
			if (!resultSet.next()) {
				System.out.println("数据库不存在");
			}
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			// Close Resource
			try {
				if (resultSet != null) {
					resultSet.close();
				}
			} catch (SQLException e1) {
				e1.printStackTrace();
			} finally {
				try {
					if (statement != null)
						statement.close();
				} catch (SQLException e) {
					e.printStackTrace();
				} finally {
					try {
						if (conn != null) {
							conn.close();
						}
					} catch (SQLException e) {
						e.printStackTrace();
					}
				}
			}
		}

判断数据库中指定表是否存在:

        Connection conn = null;
		Statement statement = null;
		try {
			conn = SqlUtils.getConnection();
			statement = conn.createStatement();
			statement.execute("use 数据库");
			// 获取日期
			Date date = new Date();
			SimpleDateFormat simple = new SimpleDateFormat("yyyy_MM_dd");
			todayTableName = "Q" + simple.format(date);
			// 判断表是否存在 不存在则创建表
			String sql = "SELECT name FROM  sysobjects WHERE name = N'表名' AND type = 'U'";
			ResultSet rs = statement.executeQuery(sql);
			if (!rs.next()) {
				System.out.println("数据表不存在");
			}
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			// Close Resource
			try {
				if (statement != null)
					statement.close();
			} catch (SQLException e) {
				e.printStackTrace();
			} finally {
				try {
					if (conn != null) {
						conn.close();
					}
				} catch (SQLException e) {
					e.printStackTrace();
				}
			}
		}

如有疑问请在下发评论

关注我,获取更多~