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[英]How to get an automatically incremented column value when inserting a row into a table in mysql using java?
[英]how to automatically update a column in another table when an insertion is made in a different column in a different table in MySql using java
私人void User_combo(){
try {
String sql = "insert into asset_update(User) select (Concat(first_name), ' ', (last_name)) from user";
pst = conn.prepareStatement(sql);
rs = pst.executeQuery();
while (rs.next()) {
String name = rs.getString("User");
jComboBox_Users.addItem(name);
}
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
}
它给我的错误是“无法使用executeQuery()发出数据操作语句;”
有人可以帮我吗? 先感谢您
使用PreparedStatement#executeUpdate
在此PreparedStatement对象中执行SQL语句,该对象必须是SQL数据操作语言(DML)语句,例如INSERT,UPDATE或DELETE
用于数据库QUERY语句的executeQuery()
(例如select)
用于数据库UPDATE语句的executeUpdate()
更新
String sql = "insert into asset_update(User) select (Concat(first_name), ' ', (last_name)) from user";
pst = conn.prepareStatement(sql);
int i = pst.executeUpdate();//since it is insert statement use executeUpdate()
if(i>0){
pst = conn.prepareStatement("Select User from asset_update");
rs = pst.executeQuery();//since it is select statement use executeQuery()
while (rs.next()) {
String name = rs.getString("User");
jComboBox_Users.addItem(name);
}
}
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