MySQL Java更新语法 [英] MySQL Java Update Syntax
本文介绍了MySQL Java更新语法的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我只是尝试在应用程序中使用更新,但我不能.在控制台上,此mysql命令有效,但在这里无效.
I just trying to use a update in my application, but i just can't. A the console, this mysql command works, but here, doesn't.
好吧,我在程序中使用了它:
Well, I use this in my program:
conexao = poolMySQL.connect();
final String sql = "UPDATE professor SET codlocal = ? WHERE codprof = ?";
pstmt = conexao.prepareStatement(sql);
pstmt.setInt(1, local);
pstmt.setInt(2, id);
try {
pstmt.executeUpdate(sql);
} catch (SQLException ex) {
Logger.getLogger(ProfessorDAO.class.getName()).log(Level.SEVERE, null, ex);
}
请记住,codlocal是另一个名为Localidade的表的外键.我看到了一些有关加入的示例,但我无法想象这对我如何起作用.
Just reminding, codlocal is a foreign key from another table, named Localidade. I saw some examples about join, but i just can't imagine how this can work for me.
我明白了:
Grave: null
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 '? WHERE codprof = ?' at line 1
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:409)
at com.mysql.jdbc.Util.getInstance(Util.java:384)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1054)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3566)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3498)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1959)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2113)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2562)
at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1664)
at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1583)
at DAO.ProfessorDAO.atualizaLocalidade(ProfessorDAO.java:153)
at DAO.Main.main(Main.java:23)
那我该怎么办?
推荐答案
您必须使用pstmt.executeUpdate();代替pstmt.executeUpdate(sql);
You have to use pstmt.executeUpdate(); in place of pstmt.executeUpdate(sql);
这篇关于MySQL Java更新语法的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文