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#2
qq10235692232016-02-25 10:41
我和教材上对比了一下,综合个人想法给个意见。好久没有用过数据库了,不过当时也没有学多少,还有吗,我觉得编程中少用中文为好。总之,我没看出来有什么错误的地方。
![]() using System; using System.Collections.Generic; using using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Data.OleDb; namespace 表格处理 { public partial class Form1 : Form { //全局变量最好在构造函数里初始化 OleDbConnection conn; OleDbCommand comm; OleDbDataAdapter adapter; DataSet ds; OleDbCommandBuilder builder; public Form1() { InitializeComponent(); //初始化变量 conn = new OleDbConnection(); comm = new OleDbCommand(); adapter = new OleDbDataAdapter(); ds = new DataSet(); conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=studentinfo.mdb"; //conn.Open(); //这个好像不用打开 comm.Connection = conn; = "select * from studentinfo where '分数'>75"; adapter.SelectCommand = comm; //使用OleDbCommandBuilder注意,对应数据库表中要有主键,否则在执行修改和删除时会出错 builder = new OleDbCommandBuilder(adapter); } private void Form1_Load(object sender, EventArgs e) { // } private void button1_Click(object sender, EventArgs e) { ds.Clear(); adapter.Fill(ds, "good"); //语法上看不出来有什么错误 d1.DataSource = ds.Tables["good"]; } private void button2_Click(object sender, EventArgs e) { adapter.Update(ds, "good"); } } } PS:你可以百度一下'标准表达式中数据类型不匹配',里面有好多的案例,或许可以解决你的问题,很有可能是字段的数据类型搞错了。 [此贴子已经被作者于2016-2-25 10:50编辑过] |
using System;
using System.Collections.Generic;
using
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.OleDb;
namespace 表格处理
{
public partial class Form1 : Form
{
OleDbConnection conn = new OleDbConnection();
OleDbCommand comm = new OleDbCommand();
OleDbDataAdapter adapter = new OleDbDataAdapter();
DataSet ds = new DataSet();
public Form1()
{
InitializeComponent();
conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=studentinfo.mdb";
conn.Open();
comm.Connection = conn;
= "select * from studentinfo where '分数'>75";
adapter.SelectCommand = comm;
OleDbCommandBuilder builder = new OleDbCommandBuilder(adapter);
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
ds.Clear();
adapter.Fill(ds, "good");
d1.DataSource = ds.Tables["good"];
}
private void button2_Click(object sender, EventArgs e)
{
adapter.Update(ds, "good");
}
}
}
注:在adapter.Fill(ds,"good")这儿提示 :标准表达式中数据类型不匹配。