这就是我的DAO课程：
public Map<String, String> issueOrUpdate(Map<String,String> employeeTempcardMap){
SlingDAO slingdao = new SlingDAO();
Map<String, String> issueOrUpdateMap = new HashMap<String, String>();
StringBuffer issueOrReturnTempcardQuery = new StringBuffer();
String empname="",functionkey="",tempcardnumber="",dateofissue="",dateofreturn="";
int empid=0,rowid=0,insertOrUpdateStatus=0;
Connection connection = slingdao.getConnection();
PreparedStatement issueOrReturnPS=null;
if (connection != null) {
try {
if(employeeTempcardMap.get("functionkey").toString().equals("issueTempCard")){
empid =Integer.parseInt(employeeTempcardMap.get("empid").toString()); //empname,tempcardnumber,dateofissue,rowid,dateofreturn
empname =employeeTempcardMap.get("empname").toString();
tempcardnumber =employeeTempcardMap.get("tempcardnumber").toString();
dateofissue =employeeTempcardMap.get("issuedate").toString();
//System.out.println("11111111111111111111111111111111111");
//System.out.println("empid : "+empid+" : empname: "+empname+" : tempcardnumber : "+tempcardnumber+": dateofissue "+dateofissue+"Status : "+applicationConstants.ISSUED);
issueOrReturnTempcardQuery.append(" INSERT INTO acct_tempcardhistory(empid,empname,tempcardnumber,tempcardstatus,issuedate,returndate) ");
issueOrReturnTempcardQuery.append(" VALUES(?,?,?,?,?,?) ");
}else{
dateofreturn = employeeTempcardMap.get("returndate").toString();
rowid = Integer.parseInt(employeeTempcardMap.get("rowid").toString());
issueOrReturnTempcardQuery.append(" UPDATE acct_tempcardhistory SET tempcardstatus=?,returndate=? ");
issueOrReturnTempcardQuery.append(" WHERE id ="+rowid);
}
issueOrReturnPS = connection.prepareStatement(issueOrReturnTempcardQuery.toString());
if(functionkey.equals("issueTempCard")){
//System.out.println("2222222222222222222222");
issueOrReturnPS.setInt(1, empid);
issueOrReturnPS.setString(2,empname.toString().trim());
issueOrReturnPS.setString(3, tempcardnumber.toString().trim());
issueOrReturnPS.setString(4, applicationConstants.ISSUED.toString().trim());
issueOrReturnPS.setString(5, dateofissue.toString().trim());
issueOrReturnPS.setString(6, "".toString().trim());
//issueOrUpdateMap.put("message","Temporary Card has been issued to "+empid);
}else {
issueOrReturnPS.setString(1, applicationConstants.RETURNED);
issueOrReturnPS.setString(2,dateofreturn);
//issueOrUpdateMap.put("message","Temporary Card has been Returned by "+empid);
}
insertOrUpdateStatus = issueOrReturnPS.executeUpdate();
System.out.println(insertOrUpdateStatus + "row(s) affected");
if(insertOrUpdateStatus >0){
issueOrUpdateMap.put("message","Temporary Card has been issued/Returned to "+empid);
}else{
issueOrUpdateMap.put("message","Temporary Card has not been issued/Returned to "+empid);
}
connection.close();
// connection.commit();
} catch (Exception ex) {
ex.printStackTrace();
issueOrUpdateMap.put("message","Temporary Card has not been issued/Returned to "+empid);
} finally {
try {
slingdao.closeConnection(connection, null, issueOrReturnPS);
} catch (Exception ex) {
ex.printStackTrace();
}
}
} else {
issueOrUpdateMap.put("dbmessage","Connection not Established. Please Contact Vendor");
}
return issueOrUpdateMap;
}
}
更新：
Stacktrace：
java.sql.SQLException: Statement parameter 3 not set.
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:910)
at com.mysql.jdbc.ServerPreparedStatement.serverExecute(ServerPreparedStatement.java:1045)
at com.mysql.jdbc.ServerPreparedStatement.executeInternal(ServerPreparedStatement.java:693)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1404)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1318)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1303)
at org.apache.tomcat.dbcp.dbcp.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedS
tatement.java:105)
at org.apache.tomcat.dbcp.dbcp.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedS
tatement.java:105)
at com.slingmedia.notifier.dao.TempCardDAO.issueOrUpdate(TempCardDAO.java:158)
at com.slingmedia.notifier.servlet.TempCardServlet.doPost(TempCardServlet.java:83)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.j
ava:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999
)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.jav
a:565)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1812)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
当我打印时，我看到所有的值都会出现但仍显示
java.sql.SQLException: Statement parameter <number> not set.
同样适用于更新，但在插入数据时不起作用，我也将日期作为字符串。
请指导我如何去做或在哪里犯错误？
此致
答案 0 :(得分：3)
您忘记将functionKey设置为表达式的结果
employeeTempcardMap.get("functionkey").toString();
永远不要使用虚拟值声明，特别是永远不会初始化您的本地变量。这只是掩盖了这样的编码问题。如果你有final String functionKey = ...，那么这种错误在理论上是不可能的。
答案 1 :(得分：1)
看看这个：
if(functionkey.equals("issueTempCard")){
现在考虑一下您期望functionkey变量从中获取值的位置。你怎么期望它等于issueTempCard？为什么创建SQL语句的条件与设置参数的条件不同？为什么你甚至有两个单独的if / else语句？
我强烈建议您重构这种方法 - 如果您使代码更清晰，它将帮助您更轻松地发现这样的问题。另外，我强烈建议您使用所有值的参数，避免使用以下代码：
issueOrReturnTempcardQuery.append(" WHERE id ="+rowid);
答案 2 :(得分：1)
if(functionkey.equals("issueTempCard")){
//System.out.println("2222222222222222222222");
issueOrReturnPS.setInt(1, empid);
issueOrReturnPS.setString(2,empname.toString().trim());
issueOrReturnPS.setString(3, tempcardnumber.toString().trim());
issueOrReturnPS.setString(4, applicationConstants.ISSUED.toString().trim());
issueOrReturnPS.setString(5, dateofissue.toString().trim());
issueOrReturnPS.setString(6, "".toString().trim());
//issueOrUpdateMap.put("message","Temporary Card has been issued to "+empid);
}else {
issueOrReturnPS.setString(1, applicationConstants.RETURNED);
issueOrReturnPS.setString(2,dateofreturn);
//issueOrUpdateMap.put("message","Temporary Card has been Returned by "+empid);
}
如果调用else，你只设置参数1和2，但你有6个参数！
答案 3 :(得分：0)
这意味着您尝试插入较少的值作为预期的代码...
实施例 你插入“1,2” 但代码预计3 所以它应该是“1,2” 它会起作用