声明：
此处需求是修改封装的clickhouseUtil数据查询引擎连接工具类。由于此类中的方法都是静态方法。连接地址等参数需要根据不同环境改变。例如开发下地址，测试下地址，生产地址等，所有通过配置文件来获取不同环境下的配置参数，但是使用的方法是静态的，所有不能使用一般情况下的@value直接给变量赋值，需要用到spring 属性的set方法来给静态变量赋值，然后静态方法使用静态变量即可
方法：
第一步：在yml文件中配置需要的参数
clickhouse: address: jdbc:clickhouse://172.20.xxx.xxx:8123 username: default password: xxxxx db: marketing socketTimeout: 600000
第二步：
类上一定要先注明@Component注解，在程序启动是自动加载，否则静态参数仍旧获取不到配置文件的值
创建静态变量
给静态变量set方法上添加@Value()
@Value("${clickhouse.address}")
public void setClickhouseAddress(String address) {
ClickHouseUtil.clickhouseAddress = address;
}
最后在静态方法中使用即可
@Component
public class ClickHouseUtil {
private static String clickhouseAddress;
private static String clickhouseUsername;
private static String clickhousePassword;
private static String clickhouseDB;
private static Integer clickhouseSocketTimeout;
@Value("${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 执行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;
}
}
以上这篇springboot 使用yml配置文件给静态变量赋值教程就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持脚本之家。
