标准安全:" Driver={SQL Server}; Server=Aron1; Database=pubs; Uid=sa; Pwd=asdasd; "
信任的连接:" Driver={SQL Server}; Server=Aron1; Database=pubs; Trusted_Connection=yes; "
标准安全" Driver={SQL Native Client}; Server=Aron1; Database=pubs; UID=sa; PWD=asdasd; "
信任的连接" Driver={SQL Native Client}; Server=Aron1; Database=pubs; Trusted_Connection=yes; " --Integrated Security=SSPI 等同于Trusted_Connection=yes
新版本:"Driver={Microsoft ODBC for Oracle}; Server=OracleServer.world; Uid=Username; Pwd=asdasd; "
旧版本:"Driver={Microsoft ODBC Driver for Oracle}; ConnectString=OracleServer.world; Uid=myUsername; Pwd=myPassword; "
标准安全:"Driver={Microsoft Access Driver (*.mdb)}; Dbq=C:\mydatabase.mdb; Uid=Admin; Pwd=; "
标准安全:" Provider=sqloledb; Data Source=Aron1; Initial Catalog=pubs; User Id=sa; Password=asdasd; "
信任的连接:" Provider=sqloledb; Data Source=Aron1; Initial Catalog=pubs; Integrated Security=SSPI; "
(use serverName\instanceName as Data Source to use an specifik SQLServer instance, only SQLServer2000)
标准安全：" Provider=SQLNCLI; Server=Aron1; Database=pubs; UID=sa; PWD=asdasd; "
信任的连接：" Provider=SQLNCLI; Server=Aron1; Database=pubs; Trusted_Connection=yes; " --Integrated Security=SSPI 等同于Trusted_Connection=yes
标准安全:"Provider=msdaora; Data Source=MyOracleDB; User Id=UserName; Password=asdasd; "
This one's from Microsoft, the following are from Oracle
标准安全:"Provider=OraOLEDB.Oracle; Data Source=MyOracleDB; User Id=Username; Password=asdasd; "
信任的连接:"Provider=OraOLEDB.Oracle; Data Source=MyOracleDB; OSAuthent=1; "
标准安全:
"Provider=Microsoft.Jet.OLEDB.4.0; Data Source=\somepath\mydb.mdb; User Id=admin; Password=; "
标准安全:
" Data Source=Aron1; Initial Catalog=pubs; User Id=sa; Password=asdasd; "
- 或者 -" Server=Aron1; Database=pubs; User ID=sa; Password=asdasd; Trusted_Connection=False"
信任的连接:" Data Source=Aron1; Initial Catalog=pubs; Integrated Security=SSPI; "
- 或者 -" Server=Aron1; Database=pubs; Trusted_Connection=True; " –(use serverName\instanceName as Data Source to use an specifik SQLServer instance, 仅仅适用于SQLServer2000)
标准安全："Data Source=MyOracleDB; Integrated Security=yes; " --This one works only with Oracle 8i release 3 or later
指定用户名和密码："Data Source=MyOracleDB; User Id=username; Password=passwd; Integrated Security=no; "--This one works only with Oracle 8i release 3 or later
指定主机："Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP) (HOST=192.168.115.33) (PORT=1521)))(CONNECT_DATA=(SERVICE_NAME= testDemo))); User Id=oracle_test; Password=oracle"
其中Oracle数据库服务器IP：192.168.115.33
ServiceName：testDemo
用户名：oracle_test
密码：oracle
DbProviderFactory是一个工厂类，工厂类的作用提供其他一系列相互之间有关系的类。在这里，DbProviderFactory就自动生成了包括DbConnection、DbCommand、 DbDataAdapter等一系列数据库操作的相关类。
1、配置文件ConnectionString节：
<configuration>
<connectionStrings>
<add name="default" connectionString="server=localhost; user id=sa; password=******; database=northwind"
providerName="System.Data.SqlClient"/>
</connectionStrings>
</configuration>
2、利用DbProviderFactory类自动查找数据库的驱动
ConnectionStringSettings settings = ConfigurationManager.ConnectionStrings["default"];
DbProviderFactory provider = DbProviderFactories.GetFactory(settings.ProviderName);
3、利用DbProviderFactory类实例创建各种ADO.Net对象。
using (DbConnection conn = provider.CreateConnection())
{
conn.ConnectionString = settings.ConnectionString;
conn.Open();
DbCommand cmd = conn.CreateCommand();
cmd.CommandText = "Select top 10 * From ShortTermBill";
//使用DbDataAdapter
DbDataAdapter da = provider.CreateDataAdapter();
da.SelectCommand = cmd;
DataSet ds = new DataSet();
da.Fill(ds);
da.Dispose();
Console.WriteLine(ds.Tables[0].Rows[0]["BillCode"]);
//使用DbDataReader
DbDataReader reader = cmd.ExecuteReader()
while (reader.Read())
{
Console.WriteLine(reader.GetString(0));
}
conn.Close();
}
三、利用DbConnection获取数据库架构信息
SQL Server 架构集合 - ADO.NET | Microsoft 官方文档
class Program
{
static void Main()
{
string connectionString = GetConnectionString();
using (SqlConnection connection = new SqlConnection(connectionString))
{
// Connect to the database then retrieve the schema information.
connection.Open();string[] columnRestrictions = new String[4];
// For the array, 0-member represents Catalog; 1-member represents Schema;
// 2-member represents Table Name; 3-member represents Column Name.
// Now we specify the Table_Name and Column_Name of the columns what we want to get schema information.
columnRestrictions[2] = "Device";
DataTable departmentIDSchemaTable = connection.GetSchema("Columns", columnRestrictions);
ShowColumns(departmentIDSchemaTable);
}
}
private static string GetConnectionString()
{
// To avoid storing the connection string in your code,
// you can retrieve it from a configuration file.
return "server=10.126.64.1;Database=TPM;user=it;pwd=;ApplicationIntent=ReadOnly;MultiSubnetFailover=True";
}
private static void ShowColumns(DataTable columnsTable)
{
var selectedRows = from info in columnsTable.AsEnumerable()
select new
{
TableCatalog = info["TABLE_CATALOG"],
TableSchema = info["TABLE_SCHEMA"],
TableName = info["TABLE_NAME"],
ColumnName = info["COLUMN_NAME"],
DataType = info["DATA_TYPE"],
ORDINAL_POSITION = info["ORDINAL_POSITION"],
COLUMN_DEFAULT = info["COLUMN_DEFAULT"],
IS_NULLABLE = info["IS_NULLABLE"],
CHARACTER_MAXIMUM_LENGTH = info["CHARACTER_MAXIMUM_LENGTH"],
NUMERIC_PRECISION = info["NUMERIC_PRECISION"],
NUMERIC_SCALE = info["NUMERIC_SCALE"],
DATETIME_PRECISION = info["DATETIME_PRECISION"],
};
Console.WriteLine("{0,-15},{1,-15},{2,-15},{3,-15},{4,-15},{5,-15},{6,-15},{7,-15},{8,-15},{9,-15},{10,-15},{11,-15}", "TableCatalog", "TABLE_SCHEMA",
"表名", "列名", "数据类型", "字段原始顺序", "列默认值", "是否可空", "字符串最大长度", "数字精度", "数字小数点位数", "日期精度"
);
foreach (var row in selectedRows)
{
Console.WriteLine("{0,-15},{1,-15},{2,-15},{3,-15},{4,-15},{5,-15},{6,-15},{7,-15},{8,-15},{9,-15},{10,-15},{11,-15}", row.TableCatalog,
row.TableSchema, row.TableName, row.ColumnName, row.DataType, row.ORDINAL_POSITION, row.COLUMN_DEFAULT, row.IS_NULLABLE
, row.CHARACTER_MAXIMUM_LENGTH, row.NUMERIC_PRECISION, row.NUMERIC_SCALE, row.DATETIME_PRECISION);
}
}
}
到此这篇关于C#使用ADO.Net连接数据库与DbProviderFactory实现多数据库访问的文章就介绍到这了。希望对大家的学习有所帮助，也希望大家多多支持易知道(ezd.cc)。
