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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,143 @@ | ||
| /* | ||
| * Copyright 2018 Mikhail Shiryaev | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| * | ||
| * | ||
| * Product : Rapid SCADA | ||
| * Module : ScadaData.Dao | ||
| * Summary : The class to simplify work with parameters of an SQL command | ||
| * | ||
| * Author : Mikhail Shiryaev | ||
| * Created : 2018 | ||
| * Modified : 2018 | ||
| */ | ||
|
|
||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.Data.Common; | ||
| using System.Text; | ||
|
|
||
| namespace Scada.Dao | ||
| { | ||
| /// <summary> | ||
| /// The class to simplify work with parameters of an SQL command | ||
| /// <para>Класс для упрощения работы с параметрами SQL-команды</para> | ||
| /// </summary> | ||
| public class RequestParams | ||
| { | ||
| /// <summary> | ||
| /// Parameter of SQL command | ||
| /// </summary> | ||
| protected class Param | ||
| { | ||
| /// <summary> | ||
| /// Gets or sets the statement to insert into an SQL clause | ||
| /// </summary> | ||
| public string SqlStatement { get; set; } | ||
| /// <summary> | ||
| /// Gets or sets the parameter name of used by a command | ||
| /// </summary> | ||
| public string ParameterName { get; set; } | ||
| /// <summary> | ||
| /// Gets or sets the parameter value | ||
| /// </summary> | ||
| public object Value { get; set; } | ||
|
|
||
| /// <summary> | ||
| /// Adds the parameter to the command | ||
| /// </summary> | ||
| public virtual void AddToCommand(DbCommand command) | ||
| { | ||
| DbParameter dbParam = command.CreateParameter(); | ||
| dbParam.ParameterName = ParameterName; | ||
| dbParam.Value = Value; | ||
| command.Parameters.Add(dbParam); | ||
| } | ||
| } | ||
|
|
||
|
|
||
| /// <summary> | ||
| /// Initializes a new instance of the class | ||
| /// </summary> | ||
| public RequestParams() | ||
| { | ||
| ParamList = new List<Param>(); | ||
| } | ||
|
|
||
|
|
||
| /// <summary> | ||
| /// Gets or sets the list of the request parameters | ||
| /// </summary> | ||
| protected List<Param> ParamList { get; set; } | ||
|
|
||
|
|
||
| /// <summary> | ||
| /// Adds a new parameter with the specified properties | ||
| /// </summary> | ||
| public void Add(string sqlStatement, string parameterName, object value, bool condition = true) | ||
| { | ||
| if (condition) | ||
| { | ||
| ParamList.Add(new Param() | ||
| { | ||
| SqlStatement = sqlStatement, | ||
| ParameterName = parameterName, | ||
| Value = value | ||
| }); | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Builds a string contains WHERE clause that includes the parameters | ||
| /// </summary> | ||
| public string BuildWhereClause() | ||
| { | ||
| if (ParamList.Count > 0) | ||
| { | ||
| StringBuilder sb = new StringBuilder("WHERE "); | ||
| bool first = true; | ||
|
|
||
| foreach (Param param in ParamList) | ||
| { | ||
| if (first) | ||
| first = false; | ||
| else | ||
| sb.Append(" AND "); | ||
|
|
||
| sb.Append(param.SqlStatement); | ||
| } | ||
|
|
||
| return sb.ToString(); | ||
| } | ||
| else | ||
| { | ||
| return ""; | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Adds the parameters to the command | ||
| /// </summary> | ||
| public void AddToCommand(DbCommand command) | ||
| { | ||
| if (command == null) | ||
| throw new ArgumentNullException("command"); | ||
|
|
||
| foreach (Param param in ParamList) | ||
| { | ||
| param.AddToCommand(command); | ||
| } | ||
| } | ||
| } | ||
| } |
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