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SafeMapping |
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作者：未知 来源：月光软件站 加入时间：2005-2-28 月光软件站 |
CREATE TABLE empInfo (
empno NUMBER(4) PRIMARY KEY,
empName VARCHAR2(20) NOT NULL,
hiredate DATE,
salary NUMBER(7,2),
jobDescription Clob,
byteCodes BLOB
);
===================================
// C#
// The following example shows how to use the SafeMapping property to fill the dataset
public static void UseSafeMapping(
string connStr)
{
//In this SELECT statement, EMPNO, HIREDATE and SALARY must be
//preserved using safe type mapping.
string cmdStr = "SELECT EMPNO, EMPNAME, HIREDATE, SALARY FROM EMPINFO";
//create the adapter with the selectCommand txt and the connection string
OracleDataAdapter adapter = new OracleDataAdapter(cmdStr, connStr);
//get the connection from the adapter
OracleConnection connection = adapter.SelectCommand.Connection;
//create the safe type mapping for the adapter
//which can safely map column data to byte arrays, where
// applicable. By executing the following statement, EMPNO, HIREDATE AND
//SALARY columns will be mapped to byte[]
adapter.SafeMapping.Add("*", typeof(byte[]));
//Map HIREDATE to a string
//If the column name in the EMPINFO table is case-sensitive,
//the safe type mapping column name must be case-sensitive.
adapter.SafeMapping.Add("HIREDATE", typeof(string));
//Map EMPNO to a string
//If the column name in the EMPINFO table is case-sensitive,
//the safe type mapping column name must also be case-sensitive.
adapter.SafeMapping.Add("EMPNO", typeof(string));
//Create and fill the DataSet using the EMPINFO
DataSet dataset = new DataSet();
adapter.Fill(dataset, "EMPINFO");
//Get the EMPINFO table from the dataset
DataTable table = dataset.Tables["EMPINFO"];
//Get the first row from the EMPINFO table
DataRow row0 = table.Rows[0];
//Print out the row info
Console.WriteLine("EMPNO Column: type = " + row0["EMPNO"].GetType() +
"; value = " + row0["EMPNO"]);
Console.WriteLine("EMPNAME Column: type = " + row0["EMPNAME"].GetType() +
"; value = " + row0["EMPNAME"]);
Console.WriteLine("HIREDATE Column: type = " + row0["HIREDATE"].GetType()+
"; value = " + row0["HIREDATE"]);
Console.WriteLine("SALARY Column: type = " + row0["SALARY"].GetType() +
"; value = " + row0["SALARY"]);
}
Output:
EMPNO Column: type = System.String; value = 1
EMPNAME Column: type = System.String; value = KING
HIREDATE Column: type = System.String; value = 01-MAY-81
SALARY Column: type = System.Byte[]; value = System.Byte[]
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