I have a SQL code as follows:
public void UpdateDatabase(String strParam1, int row)
{
System.Data.OracleClient.OracleConnection conn = new System.Data.OracleClient.OracleConnection();
conn.ConnectionString = "Data Source=(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.5.144)(PORT = 1521))(CONNECT_DATA =(SERVER = DEDICATED)(SERVICE_NAME = orcl)));UID=mwm;PWD=mwm";
conn.Open();
OracleCommand command = conn.CreateCommand();
command.CommandText = "Select id from Task";
OracleParameter taskId = new OracleParameter();
taskId.DbType = DbType.Int32;
taskId.Value = taskId;
taskId.ParameterName = "taskId";
command.Parameters.Add(taskId);
command.ExecuteNonQuery();
command.Dispose();
}
}
When ExecuteNonQuery is reached, I get an error "Failed to convert parameter value from a OracleParameter to a Int32" What is wrong here? I googled but couldn't come to a conclusion.
In this taskId.Value = taskId;
you are assigning taskId
which is of OracleParameter type a value taskID
, its is expecting an int value. In other words you are assigning the same thing to its value parameter. Since you have defined: taskId.DbType = DbType.Int32;
it is expecting an int value, and probably you miss typed it to assign taskId
again.
添加调整您的查询
"Select id from Task where id = taskId";
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