Ros*_*eti 6 java datasource connection-pooling hikaricp
我HikariDataSource用来连接MariaDB数据库。以下类返回一个Connection。
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();
}
}
}
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这是执行选择查询的方法。该类还包含一个close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);
}
}
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try-with-block Connection自动关闭对象,但是如何关闭连接池?我应该在数据库操作后调用调用close方法吗,例如
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();
}
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当我不调用该close()方法时,看不到任何有关关闭启动的控制台输出。这是关闭HikariDataSource连接池的正确方法吗?
您不需要为每个连接调用DataSource的close():
关闭数据源及其关联的池。
它仅用于终止应用程序:
close()在终止应用程序时必不可少
您应该继续使用该池,请注意您正在尝试正确使用资源来关闭(正确)连接
Run Code Online (Sandbox Code Playgroud)try (Connection connection = dataSource.getConnection()