/// <summary>
/// 生成参数。
/// </summary>
/// <param name="paramName">参数名。</param>
/// <param name="direction">参数方向。</param>
/// <param name="dataType">数据类型。</param>
/// <param name="size">长度。</param>
/// <param name="paramValue">参数值。</param>
/// <returns>构造好的参数对象。</returns>
/// <remarks>
/// 注意：重写的目的是为参数类型赋值。
/// 若数据类型为Default，不处理参数类型字段。
/// </remarks>
public override IDbDataParameter MakeParam(string paramName, ParameterDirection direction, GSPDbDataType dataType, int size, object paramValue)
{
SqlParameter param = (SqlParameter)base.MakeParam(paramName, direction, dataType, size, paramValue);
//兼容nvarchar(max)类型字段，绑定变量4001-8000范围时报The incoming tabular data stream (TDS) remote procedure call (RPC) protocol stream is incorrect" exception when using NVarchar parameters with Sqlclient
//https://support.microsoft.com/en-us/kb/970519
//Status: Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the "Applies to" section. This is scheduled to be addressed in the next major release of .NET Framework
//Resolution：To work around this issue, use one of the following options:
//· Set Sqlparamter.size property to -1 to ensure that you are getting the entire data from the backend without truncation.
//· When working with String DbTypes whose sizes are greater than 4000, explicitly map them to another SqlDBType like NText instead of using NVarchar(which also is the default SqlDBType for strings).
//· Use a value that is not between 4001 and 8000 for Sqlparameter.size.
if (size > 0)
{
param.Size = size;
}
else
{
param.Size = -1;
}
if (dataType != GSPDbDataType.Default)
{
param.SqlDbType = (SqlDbType)DBTypeManager.GetDBType(this.DbType, dataType);
}
return(param);
}
/// <summary>
/// 生成参数。
/// </summary>
/// <param name="paramName">参数名。</param>
/// <param name="direction">参数方向。</param>
/// <param name="dataType">数据类型。</param>
/// <param name="size">长度。</param>
/// <param name="paramValue">参数值。</param>
/// <returns>构造好的参数对象。</returns>
/// <remarks>
/// 注意：重写的目的是为参数类型赋值。
/// 若数据类型为Default，不处理参数类型字段。
/// </remarks>
public override IDbDataParameter MakeParam(string paramName, ParameterDirection direction, GSPDbDataType dataType, int size, object paramValue)
{
//NpgsqlParameter param = (NpgsqlParameter)base.MakeParam(paramName, direction, dataType, size, paramValue);
NpgsqlParameter param = this.CreateDBDataParameter() as NpgsqlParameter;
param.ParameterName = paramName;
if (size > 0)
{
param.Size = size;
}
if (dataType != GSPDbDataType.Default)
{
param.NpgsqlDbType = (NpgsqlDbType)DBTypeManager.GetDBType(this.DbType, dataType);
}
else
{
//如果都用bit存储boolean值，则放开；如果用boolean类型存储boolean,则放开
//if (paramValue != null && paramValue != DBNull.Value && paramValue is bool)
//{
// //反射微软驱动:Boolean是对应byte
// //new MetaType(DbType.Boolean, OracleType.Byte, OCI.DATATYPE.UNSIGNEDINT, "UNSIGNED INTEGER", typeof(byte), typeof(byte), 1, 1, false)
// param.NpgsqlDbType = NpgsqlDbType.Bit;
//}
//加这一句是对枚举类型的报错
if (paramValue != null && paramValue != DBNull.Value && paramValue.GetType().IsEnum)
{
param.NpgsqlDbType = (NpgsqlDbType)DBTypeManager.GetDBType(this.DbType, GSPDbDataType.Int);
}
}
//参数方向
param.Direction = direction;
//设置参数值，对于DateTime类型，特殊处理下
if (direction != ParameterDirection.Output || (paramValue != null && paramValue != DBNull.Value))
{
//需要特殊处理的
//日期类型的
if (paramValue != null && paramValue != DBNull.Value && dataType == GSPDbDataType.DateTime)
{
DateTime date = Convert.ToDateTime(param.Value);
param.Value = date;
}
else
{
param.Value = paramValue;
}
}
return(param);
}