我正在使用HikariDataSource
连接到一个MariaDB
数据库。下面的类返回一个Connection
对象。
public class DataSource {
private HikariDataSource ds;
// The constructor takes db name as an argument and creates a new datasource for the connection accordingly.
public DataSource(String dbString) {
HikariConfig config = new HikariConfig();
Map map = DbConfigParser.configKeyValue(dbString);
config.setJdbcUrl(String.valueOf(map.get("uri")));
config.setUsername(String.valueOf(map.get("uname")));
config.setPassword(String.valueOf(map.get("pwd")));
config.addDataSourceProperty("cachePrepStmts", "true");
config.addDataSourceProperty("prepStmtCacheSize", "250");
config.addDataSourceProperty("prepStmtCacheSqlLimit", "2048");
ds = new HikariDataSource(config);
}
// Returns a Connection to the database
public Connection getConnection() throws SQLException {
return ds.getConnection();
}
// Close the datasource
public void close(){
if (ds != null) {
ds.close();
}
}
}
这是执行选择查询的方法。该类还包含一个关闭方法。
public List<DataFile> getAllFiles() throws SQLException {
try (Connection connection = dataSource.getConnection();
DSLContext ctx = DSL.using(connection, SQLDialect.MARIADB)) {
List<DataFile> dataFileList = new DataFileQueries().selectQuery(ctx)
.fetchInto(DataFile.class);
if (dataFileList == null || dataFileList.isEmpty()) {
throw new IllegalStateException("The List is Empty!");
}
return dataFileList;
}
}
public void close() {
try {
dataSource.close();
} catch (Exception e) {
LOG.error("A SQLException was caught", e);
}
}
使用 try-with-block
可以自动关闭 Connection
对象,但我应该如何关闭连接池呢?比如在数据库操作后调用 close
方法吗?
public static void main(String[] args) throws SQLException {
DataFileDaoImpl service = new DataFileDaoImpl("testi");
List<DataFile> list = service.getAllFiles();
list.stream().forEach(
e -> System.out.println(e.toString())
);
service.close();
}
当我不调用close()
方法时,我没有看到任何关于关闭初始化的控制台输出。这是关闭HikariDataSource
和连接池的正确方式吗?
close()
而不是在每个Connection
关闭后都调用,这样做是可以的吗? - Roshan Upreti