internal SysFn GetSys()
{
if (_style == 0)
{
return(new SysFn((buildContext, buildArgs) =>
{
return Text.GenerateSql(30)
.Append(Text.Convert)
.EncloseLeft()
.Append(_def.Build())
.AppendComma()
.Append(_argument.Build(buildContext, buildArgs))
.EncloseRight()
.ToString();
},
chainException));
}
else
{
return(new SysFn((buildContext, buildArgs) =>
{
return Text.GenerateSql(30)
.Append(Text.Convert)
.EncloseLeft()
.Append(_def.Build())
.AppendComma()
.Append(_argument.Build(buildContext, buildArgs))
.AppendComma()
.Append(_style)
.EncloseRight()
.ToString();
},
chainException));
}
}
/// <summary>
/// <para>CAST AS built-in function.</para>
/// <para>Converts an expression of one data type to another.</para>
/// </summary>
/// <param name="column">A column expression.</param>
/// <param name="dataType">The target data type definition.</param>
public static SysFn Cast(Column column, DataType dataType)
{
column = column ?? Designer.Null;
return(new SysFn((buildContext, buildArgs) =>
{
if (dataType == null)
{
throw new QueryTalkException("Cast",
QueryTalkExceptionType.ArgumentNull, "dataTypeDef = null", Wall.Text.Method.SysConvert);
}
var sql = String.Format(
"CAST({0} AS {1})",
column.Build(buildContext, buildArgs),
dataType.Build());
buildContext.TryTakeException(column.Exception, "Sys.Cast");
return sql;
}));
}
/// <summary>
/// <para>CAST AS built-in function.</para>
/// <para>Converts an expression of one data type to another.</para>
/// </summary>
/// <param name="argument">A scalar expression.</param>
/// <param name="dataTypeDef">A data type definition.</param>
public static SysFn Cast(IScalar argument, DataType dataTypeDef)
{
argument = argument ?? Designer.Null;
return(new SysFn((buildContext, buildArgs) =>
{
if (dataTypeDef == null)
{
throw new QueryTalkException("Cast",
QueryTalkExceptionType.ArgumentNull, "dataTypeDef = null", Wall.Text.Method.SysConvert);
}
var sql = String.Format(
"CAST({0} AS {1})",
((Chainer)argument).Build(buildContext, buildArgs),
dataTypeDef.Build());
buildContext.TryTakeException(((Chainer)argument).Exception, "Sys.Cast");
return sql;
}));
}
internal Value(object value, Parameterization p, DataType dataType = null)
: base(value)
{
if (value == null)
{
SetAsNull();
return;
}
Original = value;
var clrType = value.GetType();
if (Mapping.CheckClrCompliance(clrType, out _clrType, out chainException) != Mapping.ClrTypeMatch.ClrMatch)
{
TryThrow();
}
DebugValue = value;
if (_clrType == typeof(DBNull) || _clrType == typeof(System.Object))
{
SetAsNull();
return;
}
_hashCode = GetCrossTypeHashCode(_clrType, value.GetHashCode());
Build = (buildContext, buildArgs) =>
{
string sql = null;
if (p != Parameterization.None)
{
sql = value.Parameterize(buildContext, dataType, p);
}
if (sql == null)
{
if (dataType != null)
{
sql = String.Format("{0}({1} AS {2})", Text.Cast, Mapping.Build(value, dataType), dataType.Build());
}
else
{
sql = Mapping.BuildUnchecked(value, out chainException);
}
}
return(sql);
};
}
