Java 更新查询在mysql中工作,但在netbeans中不工作
更新查询在mysql中工作得很好,但在netbeans中却不行。未显示任何错误,但仍不更新表。where子句可能有一些问题。请帮我解决这个问题。我认为您给出的值在错误的位置。解释如下 你的问题是Java 更新查询在mysql中工作,但在netbeans中不工作,java,mysql,sql,netbeans,Java,Mysql,Sql,Netbeans,更新查询在mysql中工作得很好,但在netbeans中却不行。未显示任何错误,但仍不更新表。where子句可能有一些问题。请帮我解决这个问题。我认为您给出的值在错误的位置。解释如下 你的问题是 private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) { String hostip = hmodify.getText(); Strin
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
String hostip = hmodify.getText();
String source = sdmodify.getText();
String target = tdmodify.getText();
String login = lnmodify.getText();
String password = String.valueOf(pmodify.getPassword());
String scheduledOn = somodify.getText();
String scheduledAt = samodify.getText();
Connection conn = null;
conn = MySqlConnect1.ConnectDB();
PreparedStatement pstmt = null;
try {
String sql = "update host set target_dir=?, source_dir=?, login_name=?, password=?, backup_schedule=?, backup_time=? where host=?";
Class.forName("com.mysql.jdbc.Driver");
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, hostip);
pstmt.setString(2, source);
pstmt.setString(3, target);
pstmt.setString(4, login);
pstmt.setString(5, password);
pstmt.setString(6, scheduledOn);
pstmt.setString(7, scheduledAt);
int i = pstmt.executeUpdate();
if(i>0)
{
JOptionPane.showMessageDialog(null,"Data is Saved");
}
else
{
JOptionPane.showMessageDialog(null,"Data is Not Saved");
}
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
}
假设主机ip为“192.168.10.10”,执行以下语句时
pstmt.setString(1,主机IP)代码>您的查询将变为
String sql = "update host set target_dir=?, source_dir=?,
login_name=?, password=?, backup_schedule=?, backup_time=? where host=?";
因此,请确保与值对应的数字在pstmt.setString语句中的顺序正确。如果您为所有列设置了错误的顺序,请尝试此操作(尤其是对于hostip
,它实际上是您的where
子句)
在我看来,参数的顺序是错误的。hostip参数应该是最后一个吗?
update host set target_dir="192.168.10.10", source_dir=?,
login_name=?, password=?, backup_schedule=?, backup_time=? where host=?;
pstmt.setString(1, target);
pstmt.setString(2, source);
pstmt.setString(3, login);
pstmt.setString(4, password);
pstmt.setString(5, scheduledOn);
pstmt.setString(6, scheduledAt);
pstmt.setString(7, hostip);