[英]Statement.execute(sql) vs executeUpdate(sql) and executeQuery(sql)
[英]execute SQL statement using executeQuery in servlet
我有servlet-
@WebServlet("/servlet123")
public class servlet123 extends HttpServlet {
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
String usrID = "111" ;
String strAllAccocuntsSQL = "SELECT * (FROM account, account_person) "
+ "WHERE (account.accountNum = account_person.accountNum"
+ "AND account_person.personID=? )ORDER BY account.accountNum;";
PreparedStatement prepareSQL = connection
.prepareStatement(strAllAccocuntsSQL);
prepareSQL.setString(1, usrID);
ResultSet resultWithAccounts = prepareSQL.executeQuery();
}
}
我检查了所有有关connection
,一切正常。
当到达行ResultSet resultWithAccounts = prepareSQL.executeQuery();
它引发异常-
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'account_person.personID='111' )ORDER BY account.accountNum' at line 1
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.Util.getInstance(Util.java:386)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1053)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4074)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4006)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2468)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2629)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2719)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155)
at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2318)
上面两个表的SQL代码是-
CREATE TABLE `account_person` (
`accountNum` INT( 11 ) NOT NULL ,
`personID` TEXT NOT NULL
)
和
CREATE TABLE `account` (
`accountNum` INT( 11 ) NOT NULL ,
`dateCreated` DATE NOT NULL ,
`accountName` TEXT,
`description` TEXT,
`statusAccount` TEXT,
`sumOfMoney` INT( 11 ) NOT NULL DEFAULT '0'
)
prepareSQL
的SQL语句中有什么错误?
我猜测:
+ "WHERE (account.accountNum = account_person.accountNum"
+ "AND account_person.personID=? )ORDER BY account.account
表示您要串联的accountNum
和AND
中间没有空格。 这与错误消息有关。
尝试删除相貌并添加一个空格:
@WebServlet("/servlet123")
public class servlet123 extends HttpServlet {
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
String usrID = "111" ;
String strAllAccocuntsSQL = "SELECT * FROM account, account_person "
+ "WHERE account.accountNum = account_person.accountNum "
+ "AND account_person.personID=? ORDER BY account.accountNum;";
PreparedStatement prepareSQL = connection
.prepareStatement(strAllAccocuntsSQL);
prepareSQL.setString(1, usrID);
ResultSet resultWithAccounts = prepareSQL.executeQuery();
}
}
SQL字符串中有错误。 您应该删除包围FROM部分的括号
String strAllAccocuntsSQL = "SELECT * FROM account, account_person "
+ "WHERE (account.accountNum = account_person.accountNum"
+ "AND account_person.personID=? )ORDER BY account.accountNum;";
我也取消; 最后,如果还不行
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.