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connect·½·¨ÊÇjava.sql.Driver½Ó¿ÚÖж¨ÒåµÄ·½·¨£¬Èç¹ûÁ¬½ÓµÄÊý¾Ý¿â²»Í¬£¬ÄÇôΪ²»Í¬µÄÊý¾Ý¿â±àдJDBCÇý¶¯½«±äµÃºÜÁé»î£¬ÊµÏÖDriver½Ó¿Ú¼´¿É¡£Á¬½ÓÊý¾Ý¿âʱÊ×ÏȵÃ×°ÔØJDBCÇý¶¯£¬Ò²¾ÍÊǵ÷Óà Class.forName(“com.mysql.jdbc.Driver”)·½·¨£¬ÔÚµÚһƪÖÐÒѾ­Áгömysql jdbc DriverÀàµÄÔ´Â룬´ËÀà¼Ì³ÐNonRegisteringDriverͬʱʵÏÖÁËjava.sql.Driver½Ó¿Ú¡£ÕÒµ½NonRegisteringDriverÀà»á·¢ÏÖËüҲʵÏÖÁËjava.sql.Driver½Ó¿Ú£º
public class NonRegisteringDriver implements java.sql.Driver {
……
}
ÔÚgetConnection·½·¨ÖÐÓÐÈçÏÂÒ»¾ä´úÂ룬
Connection result = di.driver.connect(url, info);
diÊÇDriverInfoÀàÐ͵ĶÔÏ󣬴˶ÔÏóÖаüº¬ÁËDriverµÄÒýÓ㬵«ÊÇÔÚcom.mysql.jdbc.DriverÀàÖÐÖ»ÓÐÒ»¸ö¾²Ì¬¿éºÍÒ»¸ö¹¹Ôì·½·¨£¬ÄÇôconnect·½·¨ÓпÉÄÜÊÇÔÚÆä¸¸ÀàÖÐʵÏÖ¡£ÈçǰËùÊö£¬¸¸ÀàΪNonRegisteringDriver£¬ÔÚmysqlÇý¶¯°üµÄÔ´ÂëÖпÉÒÔÕÒµ½´ËÀà,£º
com.mysql.jdbc.NonRegisteringDriver
ÄÇôdi.driver.connect(url, info) µ÷ÓõÄconnect·½·¨¾ÍÊÇNonRegisteringDriverÀàÖеÄconnect·½·¨£¬Ô´ÂëÈçÏÂ:
public java.sql.Connection connect(String url, Properties info)
throws SQLException {
if (url != null) {
if (StringUtils.startsWithIgnoreCase(url, LOADBALANCE_URL_PREFIX)) {
return connectLoadBalanced(url, info);
} else if (StringUtils.startsWithIgnoreCase(url,
REPLICATION_URL_PREFIX)) {
return connectReplicationConnection(url, info);
}
}
Properties props = null;
if ((props = parseURL(url, info)) == null) {
return null;
}
try {
Connection newConn = com.mysql.jdbc.ConnectionImpl.getInstance(
host(props), port(props), props, database(props), url);
return newConn;
} catch (SQLException sqlEx) {
// Don't wrap SQLExceptions, throw
// them un-changed.
throw sqlEx;
} catch (Exception ex) {
SQLException sqlEx = SQLError.createSQLException(Messages
.getString("NonRegisteringDriver.17") //$NON-NLS-1$
+ ex.toString()
+ Messages.getString("NonRegisteringDriver.18"), //$NON-NLS-1$
SQLError.SQL_STATE_UNABLE_TO_CONN


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