连接数据库大全

 
1         .csv;.txt;.tab;
ODBC
Standard:
'Driver={Microsoft Text Driver (*.txt; *.csv)};Dbq=c:/txtFilesFolder/;Extensions=asc,csv,tab,txt;'
OLE DB
Standard:
‘Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:/txtFilesFolder/;Extended Properties=’’text;HDR=Yes;FMT=Delimited’’’
‘HDR=Yes;’ indicates that the first row contains columnnames, not data
1.1         Vb.net
[align=left]        Dim strConn As String[/align]
[align=left]        Dim strSql As String = "select * from" + " 1.csv"[/align]
[align=left]        Dim objConn As OdbcConnection[/align]
[align=left]        Dim dataSet As DataSet = New DataSet[/align]
[align=left]        Dim dataRow As DataRow[/align]
[align=left]        Dim odbcCSVDataAdapter As New OdbcDataAdapter[/align]
[align=left]        dataSet.Tables.Add(New DataTable())[/align]
[align=left]        strConn = "Driver={Microsoft Text Driver (*.txt; *.csv)};Dbq="[/align]
[align=left]        strConn += "e:/"[/align]
[align=left]        strConn += ";Extensions=asc,csv,tab,txt;"[/align]
[align=left]        objConn = New OdbcConnection(strConn)[/align]
[align=left]        odbcCSVDataAdapter = New OdbcDataAdapter(strSql, objConn)[/align]
[align=left]        odbcCSVDataAdapter.Fill(dataSet.Tables(0))[/align]
[align=left]        dataSet.Tables(0).Columns(0).ColumnName = "商品コード"[/align]
[align=left]        For Each dataRow In dataSet.Tables(0).Rows[/align]
[align=left]            If dataRow.Item("商品コード").ToString() = "21" Then[/align]
[align=left]                MsgBox(dataSet.Tables(0).Columns(1).ColumnName)[/align]
[align=left]            End If[/align]
[align=left]        Next[/align]
[align=left]        Me.TextBox1.Text = dataSet.Tables(0).Rows(2).Item("商品コード").ToString()[/align]
1.2         Asp.net
void Page_Load(Object sender, EventArgs e)
{
  string ConnectionString;
 string SQLString;
 ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" +    Server.MapPath(".") + ";Extended Properties=/"Text;HDR=yes;FMT=Delimited/"";
 SQLString = "Select * from ReportFile.txt";
 System.Data.OleDb.OleDbConnection ConnectionText = new System.Data.OleDb.OleDbConnection();
 ConnectionText.ConnectionString = ConnectionString;
 ConnectionText.Open();
 System.Data.OleDb.OleDbDataAdapter AdapterText = new System.Data.OleDb.OleDbDataAdapter(SQLString, ConnectionText);
 System.Data.DataSet DataSetText = new System.Data.DataSet("TextFiles");
 AdapterText.Fill(DataSetText, "TextFile");
 DataGrid1.DataSource = DataSetText;
 DataGrid1.DataBind();
 ConnectionText.Close();       
}
2          读取excel
2.1         Asp.net

private DataSet CreateDataSource(){

string strConn;

strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" +

"Data Source=C://Inetpub//wwwroot//contacts.xls;"+

"Extended Properties=Excel 8.0;";

OleDbConnection conn = new OleDbConnection(strConn);

OleDbDataAdapter myCommand = new OleDbDataAdapter("SELECT * FROM [ContactList$]", strConn);

DataSet myDataSet = new DataSet();

myCommand.Fill(myDataSet);

return myDataSet;

}

public void Page_Load(Object sender, EventArgs e){

if (!IsPostBack) {

mygrid.DataSource = CreateDataSource();

mygrid.DataBind();

}

3          SQL sever
3.1         Jsp连接SQLsever 2005
3.1.1  安装好SQLsever 2005，建立数据库。
3.1.2  下载SQL Server 2005 driver for JDBC
http://download.microsoft.com/download/8/B/D/8BDABAE2-B6EA-41D4-B903-7916EF3690EF/sqljdbc_1.2.2323.101_enu.exe
将安装包解压，会有sqljdbc.jar文件，其他文件没用。在环境变量classpath 后面追加 C:/.../sqljdbc.jar
3.1.3 设置SQLEXPRESS服务器:
    a.打开SQL Server Configuration Manager -> SQLEXPRESS的协议 -> TCP/IP
    b.右键单击启动TCP/IP
    c.双击进入属性,把IP地址中的IP all中的TCP端口设置为1433
    d.重新启动SQL Server 2005服务中的SQLEXPRESS服务器
    e.关闭SQL Server Configuration Manager
3.1.4 设置工程：
在工程的Build Path à configure Build Path à java build path中的libaries标签中点Add external Jars将sqljdbc.jar添加进去。然后将sqljdbc.jar包放入workspace/工程名/WEB-INF/lib中（否则，工程无法识别驱动）
3.1.5 代码测试

[align=left]package count;[/align]
[align=left]import java.sql.*;[/align]
[align=left]publicclass Jdbc {[/align]
[align=left] public Jdbc(){    [/align]
[align=left] }[/align]
[align=left] public String getInfo(){[/align]
[align=left]    String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";[/align]
[align=left]    String dbURL = "jdbc:sqlserver://localhost:1433; DatabaseName=Working management";                                  //服务器名称[/align]
[align=left]    String userName = "sa";                     //数据库名称[/align]
[align=left]    String userPwd = "sts";                     //数据库密码[/align]
[align=left]    Connection dbConn;[/align]
[align=left]    try {[/align]
[align=left]      Class.forName(driverName).newInstance();获得驱动的对象，并将其实例化。[/align]
[align=left]      dbConn = DriverManager.getConnection(dbURL, userName, userPwd);[/align]
[align=left]      System.out.println("Connection Successful!");[/align]
[align=left]      return"ok";[/align]
[align=left]    } catch (Exception e) {[/align]
[align=left]      e.printStackTrace();[/align]
[align=left]      return"faliur";[/align]
[align=left]    } [/align]
[align=left] }[/align]
[align=left]}[/align]

注:
1.因为SQLexpress服务器默认是禁用的并且端口号没有配置,所以要进行重新设置
2.如果你以前用java连接sql server 2000的话就要注意了:
在sql server 2000 中加载驱动和URL路径的语句是
String driverName = "com.microsoft.jdbc.sqlserver.SQLServerDriver";
String dbURL = "jdbc:microsoft:sqlserver://localhost:1433; DatabaseName=sample";
而sql server 2005 中加载驱动和url的语句则为
String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
String dbURL = "jdbc:sqlserver://localhost:1433; DatabaseName=sample";
如果写法错误将会找不到驱动.
取得数据部分：
[align=left]              String sql = "select employee_no from m_employee";[/align]
[align=left]              Statement stmt = dbConn.createStatement();[/align]
[align=left]              ResultSet rs = stmt.executeQuery(sql);[/align]
[align=left]              while (rs.next()) {[/align]
[align=left]                     return rs.getString("employee_no");[/align]
[align=left]              }[/align]
[align=left]              rs.close();[/align]
              stmt.close();