宣告：

此處需求是修改封裝的clickhouseUtil資料查詢引擎連線工具類。由於此類中的方法都是靜態方法。連線地址等引數需要根據不同環境改變。例如開發下地址，測試下地址，生產地址等，所有通過配置檔案來獲取不同環境下的配置引數，但是使用的方法是靜態的，所有不能使用一般情況下的@value直接給變數賦值，需要用到spring 屬性的set方法來給靜態變數賦值，然後靜態方法使用靜態變數即可

方法：

第一步：在yml檔案中配置需要的引數

clickhouse:
  address: jdbc:clickhouse://172.20.xxx.xxx:8123
  username: default
  password: xxxxx
  db: marketing
  socketTimeout: 600000
 

第二步：

類上一定要先註明@Component註解，在程式啟動是自動載入，否則靜態引數仍舊獲取不到配置檔案的值

建立靜態變數

給靜態變數set方法上新增@Value()

 @Value("${clickhouse.address}")
    public  void setClickhouseAddress(String address) {
        ClickHouseUtil.clickhouseAddress = address;
    }

最後在靜態方法中使用即可

@Component
public class ClickHouseUtil {

    private static String clickhouseAddress;

    private static String clickhouseUsername;

    private static String clickhousePassword;

    private static String clickhouseDB;

    private static Integer clickhouseSocketTimeout;

    @Value("${clickhouse.address}")
    public  void setClickhouseAddress(String address) {
        ClickHouseUtil.clickhouseAddress = address;
    }
    @Value("${clickhouse.username}")
    public  void setClickhouseUsername(String username) {
        ClickHouseUtil.clickhouseUsername = username;
    }
    @Value("${clickhouse.password}")
    public  void setClickhousePassword(String password) {
        ClickHouseUtil.clickhousePassword = password;
    }
    @Value("${clickhouse.db}")
    public  void setClickhouseDB(String db) {
        ClickHouseUtil.clickhouseDB = db;
    }
    @Value("${clickhouse.socketTimeout}")
    public  void setClickhouseSocketTimeout(Integer socketTimeout) {
        ClickHouseUtil.clickhouseSocketTimeout = socketTimeout;
    }


    public static Connection getConn() {

        ClickHouseConnection conn = null;
        ClickHouseProperties properties = new ClickHouseProperties();
        properties.setUser(clickhouseUsername);
        properties.setPassword(clickhousePassword);
        properties.setDatabase(clickhouseDB);
        properties.setSocketTimeout(clickhouseSocketTimeout);
        ClickHouseDataSource clickHouseDataSource = new ClickHouseDataSource(clickhouseAddress,properties);
        try {
            conn = clickHouseDataSource.getConnection();
            return conn;
        } catch (SQLException e) {
            e.printStackTrace();
        }

        return null;
    }

    public static List<JSONObject> exeSql(String sql){
        log.info("cliockhouse 執行sql：" + sql);
        Connection connection = getConn();
        try {
            Statement statement = connection.createStatement();
            ResultSet results = statement.executeQuery(sql);
            ResultSetMetaData rsmd = results.getMetaData();
            List<JSONObject> list = new ArrayList();
            while(results.next()){
                JSONObject row = new JSONObject();
                for(int i = 1;i<=rsmd.getColumnCount();i++){
                    row.put(rsmd.getColumnName(i),results.getString(rsmd.getColumnName(i)));
                }
                list.add(row);
            }

            return list;
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }

}
 

感謝觀看！