C#创建MDB数据库、并存放表格数据
下面是近期学习C#连接MDB数据库，通过路径创建MDB数据库，根据名字创建创建对用MDB数据库中的表格，再通过DataTable创建一致的表并将数据放入，，，这是一个类，用完之后记得用Close()方法。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.OleDb;
using System.Data.SqlClient;
using System.IO;
using System.Windows.Forms;
namespace PartOfJRSpace.DataHelper
{
public class mdbHelper
{
private OleDbConnection myConn;
protected string test1;
///
/// 初始化连接数据库
///
///
public mdbHelper(string address)
{
try
{
//创建一个 OleDbConnection对象
string strCon = " Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source =" + address;
myConn = new OleDbConnection(strCon);
myConn.Open();
}
catch (Exception ex)
{
ex.ToString();
}
}
///
/// 关闭数据连接
///
public void CloseConnection()
{
myConn.Close();
}
///
/// 创建一个类型和datatable一致的空表
///
///
public void CreateTable(string tableName,DataTable dt)
{
try
{
string sql = "create table " + tableName;
string tableAttribute = "";
//for (int i = 0; i < dt.Columns.Count; i++)
//{
// tableAttribute = tableAttribute + dt.Columns[i].ColumnName + " " + GetType(dt.Columns[i].DataType.ToString()) + ",";
//}
//sql = sql + "(Num AUTOINCREMENT," + tableAttribute + "CONSTRAINT table_PK PRIMARYKEY(Num));";
for (int i=0;i
tableAttribute = tableAttribute + dt.Columns[i].ColumnName + " " + GetType(dt.Columns[i].DataType.ToString());
if (i < dt.Columns.Count - 1)
{
tableAttribute = tableAttribute + ",";
}
}
sql = sql + "(" + tableAttribute + ");";
OleDbCommand cmd = new OleDbCommand(sql, myConn);
cmd.ExecuteNonQuery();
}
catch(Exception ex)
{
throw;
}
}
///
/// 将datatable导入对应名字的表中
///
///
///
///
public void DatatableToMdb(string name,DataTable dt)
{
try
{
string strCom = string.Format("select * from {0}", name);
OleDbDataAdapter da = new OleDbDataAdapter(strCom, myConn);
//****
OleDbCommandBuilder cb = new OleDbCommandBuilder(da);//这里的CommandBuilder对象一定不要忘了,一般就是写在DataAdapter定义的后面
cb.QuotePrefix = "[";
cb.QuoteSuffix = "]";
DataSet midData = new DataSet();
da.Fill(midData, name);
foreach (DataRow dR in dt.Rows)
{
DataRow dr = midData.Tables[name].NewRow();
dr.ItemArray = dR.ItemArray;//行复制
midData.Tables[name].Rows.Add(dr);
}
da.Update(midData,name);
}
catch (Exception ex)
{
throw;
}
}
///
/// 获取创建mdb表格的属性字段类型
///
///
///
private string GetType(string datatype)
{
switch (datatype)//匹配类型选择
{
case "System.String":
return "TEXT(50)";
case "System.DateTime":
return "DateTime";
case "System.Double":
return "Double";
case "System.Int32":
case "System.Int16":
case "System.Int64":
return "Int";
default:
return "TEXT(50)";
}
}
///
/// 创建Access数据库
///
/// 文件和文件路径
///
public static bool CreateAccessDatabase(string path)
{
//如果文件存在反回假
if (File.Exists(path))
{
MessageBox.Show("文件已存在！");
return false;
}
try
{
//如果目录不存在，则创建目录
string dirName = Path.GetDirectoryName(path);
if (!Directory.Exists(dirName))
{
Directory.CreateDirectory(dirName);
}
//创建Catalog目录类
ADOX.CatalogClass catalog = new ADOX.CatalogClass();
string _connectionStr = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + path
+ ";";
//根据联结字符串使用Jet数据库引擎创建数据库
catalog.Create(_connectionStr);
catalog = null;
return true;
}
catch (Exception)
{
throw new Exception("数据库创建失败!");
}
}
}
}