错误的SQL指令如下: sqlStr = “select * from tb_userInfo where userName=” + userName; //错误的 sql 指令 正确的SQL指令如下: sqlStr = “select * from tb_userInfo where userName=‘’” + userName + “‘”; //正确的sql指令 错误原因:userName是文本格式 , userName 左右都须加单引号 ‘ 。C# ACCESS 查询提示“至少一个参数没有被指定”问题标签:没有 user nbsp 指定 错误 文本格式 ...
ListViewItem listViewItem=new ListViewItem(); listViewItem.SubItems[0].Text=""11111;//第一行第一例的值 listViewItem.SubItems.Add("222");///listViewItem.SubItems.Add("222");///以此类推ListView1.Items.Add(listViewItem); 三、Access中时间段查询的SQL语句书写规范(采用dateTimePick控件) 注意:# 是必须要加的string sql=select * from tableName where timeField between #"+dateTimePick1.value.ToString...
;conn = new OleDbConnection(connectionString);conn.Open();DataTable dt = conn.GetSchema("Tables");if (dt != null && dt.Rows.Count != 0){for (int i = 0; i < dt.Rows.Count; i++ ){listBox1.Items.Add(dt.Rows[i]["TABLE_NAME"].ToString());}}conn.Close();经过多次的改动測试发现。仅仅要连接字符串中出现不可识别的keyword、配置项目名称,就会提示找不到可安装的 ISAM的错误。 上面的连接字符串中的“Pwd”在SQL Ser...
/// <summary>2 /// 执行sql语句3 /// </summary>4 /// <param name="sql">需要执行的sql语句</param>5 public bool ExecuteSql(string sql, ref string errorMsg)6 {7 SetConnOpen();8 string[] sqls = serializeSql(sql);9 OleDbTransaction tran = conn.BeginTransaction(); 10 try 11 { 12 comm = new ...
System; using System.Data.OleDb;namespace ConsoleApplication {class Program{static void Main(string[] args){string strConnection = "Provider = Microsoft.ACE.OLEDB.12.0;";strConnection += @"Data Source = c:/Database1.accdb ";OleDbConnection con = new OleDbConnection(strConnection);con.Open();OleDbCommand com = con.CreateCommand();com.CommandText = "SELECT * FROM 表1";OleDbDataReader reader = com.Ex...
using System;2 using System.Data;3 using System.Configuration;4 using System.Collections;5 using System.Web;6 using System.Web.Security;7 using System.Web.UI;8 using System.Web.UI.WebControls;9 using System.Web.UI.WebControls.WebParts;10 using System.Web.UI.HtmlControls;11 using ADOX;//该命名空间包含创建ACCESS的类(方法)--解决方案 ==> 引用 ==> 添加引用 ==> 游览找到.dll12 using JRO;13 using System.I...
1. 最简单的原因是语法错误。 解决方法:在终端上试试,SQL命令串,是否可行。 2.比较隐秘的错误是insert报语法错误。 解决方法: 看看定义的字段是否与ACCESS关键字重复。 SQL和ACCESS保留字 SQL保留字 action add aggregate all alter after and as asc avg avg_row_length auto_increment between bigint bit binary blob bool both by cascade case char character change check checksum column columns comment constraint c...
System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Configuration; using Oracle.ManagedDataAccess.Client; using System.Data; using System.IO; using System.Collections; using System.Diagnostics; using Oracle.ManagedDataAccess.Types;namespace OracleDemo {public class OracleHelper{private static string connStr = "User Id=admin;Password=123;Data Source=(DESCRIP...
OleDbConnection conn = new OleDbConnection(connectionAccessString); // connectionAccessString是连接字符串conn.Open();DataTable dt = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });conn.Close();C#获取Access数据库所有表标签:log uid sch datatable access pos 连接 body blog 本文系统来源:https://www.cnblogs.com/51cnblogs/p/8135819.html
C#操作 Access 2013(.accdb)的方法标签:操作 tostring ycm 而且 word users 5.0 proc ring 本文系统来源:https://www.cnblogs.com/workstation-nigoudongma/p/9668951.html
System; using System.Collections; using System.Collections.Specialized; using System.Data; using System.Data.OleDb; namespace Maticsoft.DBUtility {/// <summary>/// 数据访问基础类(基于OleDb)/// 可以用户可以修改满足自己项目的需要。/// </summary>public class DbHelperOleDb{//数据库连接字符串(web.config来配置),可以动态更改connectionString支持多数据库.public string connectionString = "";public DbHelper...
(backupPathDir.Exists) {System.IO.DirectoryInfo di = new DirectoryInfo(backupPathDir.ToString());foreach (FileInfo file in di.GetFiles()) {file.Attributes = FileAttributes.Normal;file.Delete();}foreach (DirectoryInfo dir in di.GetDirectories()) {dir.Delete(true);}backupPathDir.Delete(true);} 报错如下: 原因:文件权限问题,文件从别的地方复制到备份文件夹时,权限也复制过来了,再删除备份文件夹,删...
System; using System.Data; using System.Collections.Generic; using System.Configuration; using System.Text; using System.IO; using Oracle.ManagedDataAccess.Client; //using System.Data.OracleClient; System.Data.OracleClient类已经不推荐使用namespace Fly.Util.DataBase {/// <summary>/// Oracle数据库操作类/// </summary>public static class OracleHelper{/// <summary> /// 执行数据库非查询操作,返回受影...
"; 红色标注的部分是要使用绝对路径不然对access不能插入不能修改 另外 执行command字符串时先在t-sql中调试关键字,如表格名称。字段名尽量用[ ]括起来【c#】ADO操作Access的mdb数据库只能读不能修改的解决方法标签:access 关键字 操作 sof command man 不能 插入 ESS 本文系统来源:https://www.cnblogs.com/minabrk/p/11616642.html
配置文件 不带密码带密码public static class Access { public static readonly string connstr = ConfigurationManager.AppSettings["connstr"].ToString(); public static DataTable Get(string sql) { using (OleDbConnection conn = new OleDbConnection(connstr)) { conn.Open(); OleDbDataAdapter dbDataAdapter = new OleDbDataAdapter(sql, conn); //创建适配对象 DataTable dt = new DataTable(); //新建表对象 dbDataAda...