我有时需要查看SubSonic生成的SQL语句。
这适用于:
SqlQuery qry = DB.Select().From<Product>()
.Where(Products.Columns.Name).IsEqualTo("Productname");
Console.WriteLine(qry.BuildSqlStatement());
但是,它返回带有参数(SELECT ... WHERE productname = ?productname
)的查询。因此,我总是必须在我的代码中找到真正的值,并用propper格式化的值替换参数(例如productname ='Productname'),这对于复杂的查询来说真的很烦人。
所以,我决定制作一个我想要分享的扩展方法(查看我的代码答案)。
答案 0 :(得分:2)
它远非完美,但它现在符合我的需要。
但我可以使用
Console.WriteLine(qry.BuildSqlStatementDebug());
然后将结果复制到剪贴板并从查询浏览器中再次运行我的数据库。
using System;
using SubSonic;
namespace MyNamespace.ExtensionMethods
{
public static class SubsonicSqlQueryExtensionMethods
{
public static String BuildSqlStatementDebug(this SqlQuery qry)
{
var result = qry.BuildSqlStatement();
foreach (var c in qry.Constraints)
{
if (c.Comparison == Comparison.BetweenAnd)
{
result = result.Replace(c.ParameterName + "_start", GetFormattedValue(c.StartValue, c.DbType));
result = result.Replace(c.ParameterName + "_end", GetFormattedValue(c.EndValue, c.DbType));
}
else
{
result = result.Replace(c.ParameterName, GetFormattedValue(c.ParameterValue, c.DbType));
}
}
return result;
}
// Works for MySQL
private static readonly String formatter_date = "'{0:yyyy-MM-dd}'";
private static readonly String formatter_datetime = "'{0:yyyy-MM-dd hh:mm:ss}'";
private static readonly String formatter_string = "'{0}'";
private static String GetFormattedValue(Object value, System.Data.DbType type)
{
switch (type)
{
case System.Data.DbType.AnsiString:
return String.Format(formatter_string, value);
case System.Data.DbType.AnsiStringFixedLength:
return String.Format(formatter_string, value);
//case System.Data.DbType.Binary:
// break;
case System.Data.DbType.Boolean:
return (Boolean)value == true ? "true" : "false";
//case System.Data.DbType.Byte:
// break;
//case System.Data.DbType.Currency:
// break;
case System.Data.DbType.Date:
return String.Format(formatter_date, value); break;
case System.Data.DbType.DateTime:
return String.Format(formatter_datetime, value); break;
case System.Data.DbType.DateTime2:
return String.Format(formatter_datetime, value); break;
//case System.Data.DbType.DateTimeOffset:
// break;
//case System.Data.DbType.Decimal:
// break;
//case System.Data.DbType.Double:
// break;
case System.Data.DbType.Guid:
return String.Format(formatter_string, value);
//case System.Data.DbType.Int16:
// break;
//case System.Data.DbType.Int32:
// break;
//case System.Data.DbType.Int64:
// break;
//case System.Data.DbType.Object:
// break;
//case System.Data.DbType.SByte:
// break;
//case System.Data.DbType.Single:
// break;
case System.Data.DbType.String:
return String.Format(formatter_string, value);
case System.Data.DbType.StringFixedLength:
return String.Format(formatter_string, value);
//case System.Data.DbType.Time:
// break;
//case System.Data.DbType.UInt16:
// break;
//case System.Data.DbType.UInt32:
// break;
//case System.Data.DbType.UInt64:
// break;
//case System.Data.DbType.VarNumeric:
// break;
case System.Data.DbType.Xml:
return String.Format(formatter_string, value);
default:
return value.ToString();
}
}
}
}