在系统中使用jdbc 连接mysql, 首次成功,之后连接就报错,驱动用的是mysql-connector-java-5.1.15-bin.jar
连接代码
Connection conn = null;
Statement stat = null;
ResultSet rs = null;
String url = "jdbc:mysql://*********:3306/*******?useUnicode=true&characterEncoding=GBK";
String sql = null;
String tableName = "***";
List<ClockBO> clock = new ArrayList<ClockBO>();
sql = "select * from "
+ tableName
+ " where timevalue between '"
+ startTime
+ "' and '" + endTime + "' and doorName='" + doorName.substring(2) + "'";
System.out.println(sql);
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(url, "root", "****");
stat = conn.createStatement();
rs = stat.executeQuery(sql);
while (rs.next()) {
ClockBO bo = new ClockBO();
ClockPKBO pkbo = new ClockPKBO();
pkbo.setCardNo1(rs.getString(1));
pkbo.setCardNo2(rs.getString(2));
pkbo.setTimeValue(ft.format(rs.getTimestamp(6)));
bo.setPersonNo(rs.getString(3));
bo.setPersonName(rs.getString(4));
bo.setDepartment(rs.getString(5));
bo.setCtlIp(rs.getString(7));
bo.setDoorNo(rs.getString(8));
bo.setDoorName(rs.getString(9));
bo.setStateId(rs.getString(10));
bo.setRptState(rs.getString(11));
bo.setStateStr(rs.getString(12));
bo.setClockPK(pkbo);
clock.add(bo);
System.out.println(rs.getString(4));
System.out.println(bo.toString());
}
} catch (Exception e) {
e.printStackTrace();
}finally{
try{
if(null!=rs){
rs.close();
}
if(null!=stat){
stat.close();
}
if(null!=conn){
conn.commit();
conn.close();
}
}catch(SQLException e){
e.printStackTrace();
}
}
首次连接可以查出数据,再次调用就在连接的时候就抛出异常了,异常信息如下
java.sql.SQLException: ResultSet is from UPDATE. No Data.
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1078)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:989)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:975)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:920)
at com.mysql.jdbc.ResultSetImpl.next(ResultSetImpl.java:6999)
at com.mysql.jdbc.ConnectionImpl.loadServerVariables(ConnectionImpl.java:4184)
at com.mysql.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:3585)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2534)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2304)
at com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:834)
at com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:416)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:346)
为什么会出现这种情况呢?