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NpgsqlParameter`.cs
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112 lines (98 loc) · 3.93 KB
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using System;
using System.Data;
using System.Diagnostics;
using System.Threading.Tasks;
using Npgsql.TypeMapping;
using NpgsqlTypes;
namespace Npgsql
{
/// <summary>
/// A generic version of <see cref="NpgsqlParameter"/> which provides more type safety and
/// avoids boxing of value types. Use <see cref="TypedValue"/> instead of <see cref="NpgsqlParameter.Value"/>.
/// </summary>
/// <typeparam name="T">The type of the value that will be stored in the parameter.</typeparam>
public sealed class NpgsqlParameter<T> : NpgsqlParameter
{
/// <summary>
/// Gets or sets the strongly-typed value of the parameter.
/// </summary>
public T TypedValue { get; set; }
/// <summary>
/// Gets or sets the value of the parameter. This delegates to <see cref="TypedValue"/>.
/// </summary>
public override object Value
{
get => TypedValue;
set => TypedValue = (T)value;
}
#region Constructors
/// <summary>
/// Initializes a new instance of <see cref="NpgsqlParameter{T}" />.
/// </summary>
public NpgsqlParameter() {}
/// <summary>
/// Initializes a new instance of <see cref="NpgsqlParameter{T}" /> with a parameter name and value.
/// </summary>
public NpgsqlParameter(string parameterName, T value)
{
ParameterName = parameterName;
TypedValue = value;
}
/// <summary>
/// Initializes a new instance of <see cref="NpgsqlParameter{T}" /> with a parameter name and type.
/// </summary>
public NpgsqlParameter(string parameterName, NpgsqlDbType npgsqlDbType)
{
ParameterName = parameterName;
NpgsqlDbType = npgsqlDbType;
}
/// <summary>
/// Initializes a new instance of <see cref="NpgsqlParameter{T}" /> with a parameter name and type.
/// </summary>
public NpgsqlParameter(string parameterName, DbType dbType)
{
ParameterName = parameterName;
DbType = dbType;
}
#endregion Constructors
internal override void ResolveHandler(ConnectorTypeMapper typeMapper)
{
if (Handler != null)
return;
// TODO: Better exceptions in case of cast failure etc.
if (_npgsqlDbType.HasValue)
Handler = typeMapper[_npgsqlDbType.Value, SpecificType];
else if (_dbType.HasValue)
Handler = typeMapper[_dbType.Value];
else if (TypedValue != null)
{
// DateTime/NpgsqlDateTime are mapped to timestamp/timestamptz based on their
// Kind, so we need a special hack here
if (typeof(T) == typeof(DateTime) || typeof(T) == typeof(NpgsqlDateTime))
Handler = typeMapper[TypedValue]; // Yeah, this boxes
else
Handler = typeMapper[typeof(T)];
}
else
throw new InvalidOperationException($"Parameter '{ParameterName}' must have its value set");
}
internal override int ValidateAndGetLength()
{
Debug.Assert(Handler != null);
if (TypedValue == null)
throw new InvalidCastException($"Parameter {ParameterName} must be set");
// TODO: Why do it like this rather than a handler?
if (typeof(T) == typeof(DBNull))
return 0;
var lengthCache = LengthCache;
var len = Handler.ValidateAndGetLength(TypedValue, ref lengthCache, this);
LengthCache = lengthCache;
return len;
}
internal override Task WriteWithLength(NpgsqlWriteBuffer buf, bool async)
{
Debug.Assert(Handler != null);
return Handler.WriteWithLengthInternal(TypedValue, buf, LengthCache, this, async);
}
}
}