public static DataSource getDataSource() {
		if(dataSource == null) {
			synchronized (JdbcHelper.class) {
				if(dataSource == null) {
					initialize();
				}
			}
		}
		AssertHelper.notNull(dataSource);
		return dataSource;
	}
public static DataSource getDataSource() {
		if(dataSource == null) {
			synchronized (JdbcHelper.class) {
				if(dataSource == null) {
					initialize();
				}
			}
		}
		AssertHelper.notNull(dataSource);
		return dataSource;
	}
public static DataSource getDataSource ( ) { if ( dataSource == null ) { synchronized ( JdbcHelper . class ) { if ( dataSource == null ) { initialize ( ) ; } } } AssertHelper . notNull ( dataSource ) ; return dataSource ; }
返回数据源dataSource
@return
返回数据源dataSource