mongoDB java WriteConcern

这里列举下 mongoDB java驱动里的WriteConcern 有哪些同时表示什么含义。

主要摘录自：WriteConcern 这个类，java驱动版本是2.5.2

 

 

 /** No exceptions are raised, even for network issues */
    public final static WriteConcern NONE = new WriteConcern(-1);

    /** Exceptions are raised for network issues, but not server errors */
    public final static WriteConcern NORMAL = new WriteConcern(0);
    
    /** Exceptions are raised for network issues, and server errors; waits on a server for the write operation */
    public final static WriteConcern SAFE = new WriteConcern(1);
    
    /** Exceptions are raised for network issues, and server errors and the write operation waits for the server to flush the data to disk*/
    public final static WriteConcern FSYNC_SAFE = new WriteConcern(true);

    /** Exceptions are raised for network issues, and server errors; waits for at least 2 servers for the write operation*/
    public final static WriteConcern REPLICAS_SAFE = new WriteConcern(2);

 

 

<ul>
 * 	<li>-1 = don't even report network errors </li>
 *  <li> 0 = default, don't call getLastError by default </li>
 *  <li> 1 = basic, call getLastError, but don't wait for slaves</li>
 *  <li> 2+= wait for slaves </li>
 * </ul>
 * <b>wtimeout</b> how long to wait for slaves before failing
 * <ul>
 *   <li>0 = indefinite </li>
 *   <li>> 0 = ms to wait </li>
 * </ul>
 * </p>
 * <p><b>fsync</b> force fsync to disk </p>