我有以下代码:
Using cmd As SqlCommand = Connection.CreateCommand
cmd.CommandText = "UPDATE someTable SET Value = @Value"
cmd.CommandText &= " WHERE Id = @Id"
cmd.Parameters.AddWithValue("@Id", 1234)
cmd.Parameters.AddWithValue("@Value", "myValue")
cmd.ExecuteNonQuery
End Using
我想知道是否有任何方法来获得最终的SQL语句作为字符串，它应该看起来像这样:
UPDATE someTable SET Value = "myValue" WHERE Id = 1234
如果有人想知道我为什么要这么做
用于记录(失败的)语句 可以将其复制粘贴到企业管理器中进行测试
当前回答
//For Oracle db in the sql text the parameters could be like :ID,:NAME etc.
//This is same as above Seyed Hossein Mirheydari, but slightly improved,
//this works with parameter names well.
//Further is straight simple one, you need to format for datatypes
//after query is generated.
private string GetFullOraQuery(OracleCommand cmd)
{
string query = cmd.CommandText;
foreach (OracleParameter p in cmd.Parameters)
{
query = query.Replace(":" + p.ParameterName, ((p.Value == null) ? "" : p.Value.ToString()));
}
return query;
}
其他回答
如果你的数据库是Oracle, sql文本包含动态变量，如:1，:2，…然后你可以使用:
string query = cmd.CommandText;
int i = 1;
foreach (OracleParameter p in cmd.Parameters)
{
query = query.Replace(":"+i.ToString(),((p.Value==null)?"":p.Value.ToString()));
i++;
}
也需要覆盖非存储过程，所以我用以下逻辑扩充了CommandAsSql库(见上面@Flapper的回答下的评论):
private static void CommandAsSql_Text(this SqlCommand command, System.Text.StringBuilder sql)
{
string query = command.CommandText;
foreach (SqlParameter p in command.Parameters)
query = Regex.Replace(query, "\\B" + p.ParameterName + "\\b", p.ParameterValueForSQL()); //the first one is \B, the 2nd one is \b, since ParameterName starts with @ which is a non-word character in RegEx (see https://stackoverflow.com/a/2544661)
sql.AppendLine(query);
}
pull请求在: https://github.com/jphellemons/CommandAsSql/pull/3/commits/527d696dc6055c5bcf858b9700b83dc863f04896
Regex的想法是基于@stambikk和EvZ上面的评论，以及https://stackoverflow.com/a/2544661/903783的“更新:”部分提到了“消极的事后判断”。在正则表达式的开头使用\B而不是\B来进行单词边界检测是因为p.parameterName总是以“@”开头，而“@”不是单词字符。
注意ParameterValueForSQL()是CommandAsSql库中定义的一个扩展方法，用于处理单引号字符串参数值等问题。
这个方法是我自己写的。我用了布鲁诺·拉尼克的代码。也许它对某人有用。
public static string getQueryFromCommand(SqlCommand cmd)
{
StringBuilder CommandTxt = new StringBuilder();
CommandTxt.Append("DECLARE ");
List<string> paramlst = new List<string>();
foreach (SqlParameter parms in cmd.Parameters)
{
paramlst.Add(parms.ParameterName);
CommandTxt.Append(parms.ParameterName + " AS ");
CommandTxt.Append(parms.SqlDbType.ToString());
CommandTxt.Append(",");
}
if (CommandTxt.ToString().Substring(CommandTxt.Length-1, 1) == ",")
CommandTxt.Remove(CommandTxt.Length-1, 1);
CommandTxt.AppendLine();
int rownr = 0;
foreach (SqlParameter parms in cmd.Parameters)
{
string val = String.Empty;
if (parms.DbType.Equals(DbType.String) || parms.DbType.Equals(DbType.DateTime))
val = "'" + Convert.ToString(parms.Value).Replace(@"\", @"\\").Replace("'", @"\'") + "'";
if (parms.DbType.Equals(DbType.Int16) || parms.DbType.Equals(DbType.Int32) || parms.DbType.Equals(DbType.Int64) || parms.DbType.Equals(DbType.Decimal) || parms.DbType.Equals(DbType.Double))
val = Convert.ToString(parms.Value);
CommandTxt.AppendLine();
CommandTxt.Append("SET " + paramlst[rownr].ToString() + " = " + val.ToString());
rownr += 1;
}
CommandTxt.AppendLine();
CommandTxt.AppendLine();
CommandTxt.Append(cmd.CommandText);
return CommandTxt.ToString();
}
扩展Kon的代码来帮助调试存储过程:
private void ExtractSqlCommandForDebugging(SqlCommand cmd)
{
string sql = "exec " + cmd.CommandText;
bool first = true;
foreach (SqlParameter p in cmd.Parameters)
{
string value = ((p.Value == DBNull.Value) ? "null"
: (p.Value is string) ? "'" + p.Value + "'"
: p.Value.ToString());
if (first)
{
sql += string.Format(" {0}={1}", p.ParameterName, value);
first = false;
}
else
{
sql += string.Format("\n , {0}={1}", p.ParameterName, value);
}
}
sql += "\nGO";
Debug.WriteLine(sql);
}
在我的第一个测试用例中，它生成:
exec dbo.MyStoredProcName @SnailMail=False
, @Email=True
, @AcceptSnailMail=False
, @AcceptEmail=False
, @DistanceMiles=-1
, @DistanceLocationList=''
, @ExcludeDissatisfied=True
, @ExcludeCodeRed=True
, @MinAge=null
, @MaxAge=18
, @GenderTypeID=-1
, @NewThisYear=-1
, @RegisteredThisYear=-1
, @FormersTermGroupList=''
, @RegistrationStartDate=null
, @RegistrationEndDate=null
, @DivisionList='25'
, @LocationList='29,30'
, @OneOnOneOPL=-1
, @JumpStart=-1
, @SmallGroup=-1
, @PurchasedEAP=-1
, @RedeemedEAP=-1
, @ReturnPlanYes=False
, @MinNetPromoter=-1
, @MinSurveyScore=-1
, @VIPExclusionTypes='-2'
, @FieldSelectionMask=65011584
, @DisplayType=0
GO
你可能需要添加一些有条件的“..is…”类型的赋值，例如日期和时间。
为了记录日志，恐怕没有更好的方法了，只能自己构造字符串:
string query = cmd.CommandText;
foreach (SqlParameter p in cmd.Parameters)
{
query = query.Replace(p.ParameterName, p.Value.ToString());
}
