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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Data;
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using System.Data.Sql;
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using System.Data.SqlClient;
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using System.Data.SqlTypes;
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using System.Data.Common;
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using System.Collections;
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using Microsoft.SqlServer.Server;
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namespace ClrDemoNet45
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{
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/// <summary>
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/// SQL Server 调用 CLR 示例程序集
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/// 注意：1、方法必须是公共静态方法，
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/// 2、返回值必须是 SqlInt32、System.Int32、System.Nullable<System.Int32> 或 void
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/// 3、加上SqlProcedure等特性
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/// </summary>
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public class ClrDemo
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{
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#region 存储过程
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/// <summary>
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/// 向调用客户端发送文本
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/// </summary>
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[SqlProcedure]
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public static void UseClr()
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{
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SqlContext.Pipe.Send("Hello,SQL Server CLR!");
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}
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/// <summary>
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/// 获取一个随机整数
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/// 注意：方法的返回值，似乎不起使用
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/// 返回值：方法一是使用输出参数 方法二是使用 SqlContext.Pipe.Send
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/// </summary>
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[SqlProcedure]
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public static int GetRandom()
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{
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Random random = new Random();
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return random.Next(0, 1000);
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}
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/// <summary>
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/// 返回总数据行数
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/// 使用 SqlContext.Pipe.ExecuteAndSend 直接发送 SqlCommand 结果到客户端(存储过程结果)
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/// </summary>
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/// <returns></returns>
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[SqlProcedure]
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public static void ReturnCount()
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{
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using (SqlConnection conn = new SqlConnection("Context Connection=true"))
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{
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conn.Open();
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string sqlText = "SELECT ISNULL(COUNT(*),0) AS StudentCount FROM dbo.Student;";
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SqlCommand command = new SqlCommand(sqlText, conn);
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command.CommandType = CommandType.Text;
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SqlContext.Pipe.ExecuteAndSend(command);
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conn.Close();
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}
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}
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/// <summary>
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/// 获取总数据行数
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/// 使用 out 参数，返回值。
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/// </summary>
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[SqlProcedure]
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public static int GetCount(out int totalCount)
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{
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using (SqlConnection conn = new SqlConnection("Context Connection=true"))
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{
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conn.Open();
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string sqlText = "SELECT ISNULL(COUNT(*),0) AS StudentCount FROM dbo.Student;";
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SqlCommand command = new SqlCommand(sqlText, conn);
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command.CommandType = CommandType.Text;
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totalCount = (int)command.ExecuteScalar();
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conn.Close();
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return totalCount;
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}
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}
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/// <summary>
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/// 查询数据表
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/// SqlContext.Pipe.ExecuteAndSend 发送DataTable
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/// </summary>
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[SqlProcedure]
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public static void GetStudents()
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{
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using (SqlConnection conn = new SqlConnection("Context Connection=true"))
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{
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conn.Open();
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string sqlText = "SELECT * FROM dbo.Student;";
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SqlCommand command = new SqlCommand(sqlText, conn);
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command.CommandType = CommandType.Text;
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SqlContext.Pipe.ExecuteAndSend(command);
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conn.Close();
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}
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}
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/// <summary>
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/// 使用 SqlDataRecord 发送单行数据
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/// </summary>
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[SqlProcedure]
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public static void UseSqlDataRecord()
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{
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//创建 metadata 作为 SqlDataRecord 列
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List<SqlMetaData> columns = new List<SqlMetaData>()
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{
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new SqlMetaData("Id", SqlDbType.Int),
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new SqlMetaData("SchoolName", SqlDbType.NVarChar, 50),
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new SqlMetaData("ClassNumber", SqlDbType.Int),
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new SqlMetaData("StudentNumber", SqlDbType.Int)
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};
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SqlDataRecord record = new SqlDataRecord(columns.ToArray());
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// 设置列的值
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record.SetInt32(0, -1);
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record.SetString(1, "太康七高");
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record.SetInt32(2, 20);
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record.SetInt32(3, 55);
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// 发送到客户端
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SqlContext.Pipe.Send(record);
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}
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/// <summary>
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/// 返回自定义结果集
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/// 使用 SendResultsStart SendResultsRow SendResultsEnd
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/// </summary>
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[SqlProcedure]
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public static void UseSendResultsRow()
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{
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//创建 metadata 作为 SqlDataRecord 列
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List<SqlMetaData> columns = new List<SqlMetaData>()
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{
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new SqlMetaData("Id", SqlDbType.Int),
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new SqlMetaData("SchoolName", SqlDbType.NVarChar, 50),
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new SqlMetaData("ClassNumber", SqlDbType.Int),
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new SqlMetaData("StudentNumber", SqlDbType.Int)
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};
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SqlDataRecord record = new SqlDataRecord(columns.ToArray());
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//开始发送
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SqlContext.Pipe.SendResultsStart(record);
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// 发送10行数据到客户端
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for (int i = 1; i <= 10; i++)
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{
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// 设置列的值
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record.SetInt32(0, i);
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record.SetString(1, $"太康{i}高");
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record.SetInt32(2, 20 + i);
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record.SetInt32(3, 100 + i);
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// 发送当前行到客户端
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SqlContext.Pipe.SendResultsRow(record);
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}
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// 发送结束
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SqlContext.Pipe.SendResultsEnd();
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}
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/// <summary>
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/// 汇总学校学生数量
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/// </summary>
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[SqlProcedure]
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public static void SummaryData()
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{
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using (SqlConnection conn = new SqlConnection("Context Connection=true"))
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{
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conn.Open();
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string sqlText = "UPDATE dbo.School SET StudentNumber=(SELECT COUNT(*) FROM dbo.Student WHERE SchoolId = School.Id);";
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SqlCommand command = new SqlCommand(sqlText, conn);
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command.CommandType = CommandType.Text;
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SqlContext.Pipe.ExecuteAndSend(command);
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conn.Close();
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}
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}
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/// <summary>
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/// 汇总学生数量
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/// (只为演示效果，实际开发一条语句即可)
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/// </summary>
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[SqlProcedure]
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public static void SummaryStudentCount()
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{
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bool isSucess = true;
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string message = "ok";
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try
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{
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using (SqlConnection conn = new SqlConnection("Context Connection=true"))
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{
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conn.Open();
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//1、拉所有学校
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SqlDataAdapter da = new SqlDataAdapter("SELECT Id FROM dbo.School;", conn);
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DataTable schoolTable = new DataTable();
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da.Fill(schoolTable);
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foreach (DataRow row in schoolTable.Rows)
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{
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var schoolId = (int)row["Id"];
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var studentCount = 0;
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using (SqlCommand queryStudentCountCommand = new SqlCommand())
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{
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//查询该学校学生人数
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string queryStudentCountText = "SELECT ISNULL(COUNT(*),0) AS StudentCount FROM dbo.Student where [SchoolId]=@SchoolId;";
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SqlParameter schoolIdPara = new SqlParameter()
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{
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ParameterName = "@SchoolId",
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Direction = ParameterDirection.Input,
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SqlDbType = SqlDbType.Int,
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Value = schoolId,
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};
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queryStudentCountCommand.Connection = conn;
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queryStudentCountCommand.CommandText = queryStudentCountText;
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queryStudentCountCommand.CommandType = CommandType.Text;
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queryStudentCountCommand.Parameters.Add(schoolIdPara);
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studentCount = (int)queryStudentCountCommand.ExecuteScalar();
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}
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//更新
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using (SqlCommand updateStudentCountCommand = new SqlCommand())
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{
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string updateStudentCountText = "UPDATE dbo.School SET StudentNumber=@StudentNumber WHERE Id=@SchoolId;";
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SqlParameter updateSchoolIdPara = new SqlParameter()
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{
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ParameterName = "@SchoolId",
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Direction = ParameterDirection.Input,
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SqlDbType = SqlDbType.Int,
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Value = schoolId,
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};
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SqlParameter updateStudentCountPara = new SqlParameter()
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{
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ParameterName = "@StudentNumber",
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Direction = ParameterDirection.Input,
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SqlDbType = SqlDbType.Int,
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Value = studentCount,
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};
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updateStudentCountCommand.Connection = conn;
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updateStudentCountCommand.CommandText = updateStudentCountText;
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updateStudentCountCommand.CommandType = CommandType.Text;
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updateStudentCountCommand.Parameters.Add(updateSchoolIdPara);
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updateStudentCountCommand.Parameters.Add(updateStudentCountPara);
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updateStudentCountCommand.ExecuteNonQuery();
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}
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}
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conn.Close();
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}
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}
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catch (Exception ex)
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{
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isSucess = false;
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message = ex.Message;
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}
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List<SqlMetaData> columns = new List<SqlMetaData>()
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{
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new SqlMetaData("Sucess", SqlDbType.Bit),
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new SqlMetaData("Message", SqlDbType.NVarChar, 500),
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};
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SqlDataRecord record = new SqlDataRecord(columns.ToArray());
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record.SetBoolean(0, isSucess);
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record.SetString(1, message);
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SqlContext.Pipe.Send(record);
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}
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#endregion
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#region 自定义函数
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/// <summary>
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/// 标量函数
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/// 查询指定学校的学生数量
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/// </summary>
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[SqlFunction(DataAccess = DataAccessKind.Read, IsDeterministic = false)]
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public static int QuerySchoolStudentCount(int schoolId)
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{
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using (SqlConnection conn = new SqlConnection("Context Connection=true"))
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{
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conn.Open();
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string sqlText = "SELECT ISNULL(COUNT(*),0) AS StudentCount FROM dbo.Student where [SchoolId]=@SchoolId;";
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SqlParameter schoolIdPara = new SqlParameter()
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{
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ParameterName = "@SchoolId",
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Direction = ParameterDirection.Input,
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SqlDbType = SqlDbType.Int,
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Value = schoolId,
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};
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SqlCommand command = new SqlCommand()
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{
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Connection = conn,
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CommandText = sqlText,
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CommandType = CommandType.Text,
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};
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command.Parameters.Add(schoolIdPara);
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var studentCount = (int)command.ExecuteScalar();
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conn.Close();
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return studentCount;
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}
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}
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/// <summary>
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/// 表值函数:返回一个数据集合，必须用一个填充数据的方法，在属性中用FillRowMethodName来表示，且返回值应该为IEnumerable类型
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/// 查询指定学校的所有学生
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/// </summary>
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[SqlFunction(DataAccess = DataAccessKind.Read, FillRowMethodName = "FillRow_ReturnData", IsDeterministic = false)]
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public static IEnumerable QueryStudent()
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{
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IList returnDataList = new List<School>();
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returnDataList.Add(new School() { Id = 1, SchoolName = "太康一高", ClassNumber = 10, StudentNumber = 150 });
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returnDataList.Add(new School() { Id = 2, SchoolName = "太康二高", ClassNumber = 20, StudentNumber = 250 });
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returnDataList.Add(new School() { Id = 3, SchoolName = "太康三高", ClassNumber = 30, StudentNumber = 350 });
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return returnDataList;
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}
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/// <summary>
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/// 填充方法
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/// </summary>
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/// <param name="returnDataObj"></param>
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/// <param name="name"></param>
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/// <param name="password"></param>
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public static void FillRow_ReturnData(object returnDataObj, out SqlInt32 Id, out SqlString SchoolName, out SqlInt32 ClassNumber, out SqlInt32 StudentNumber)
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{
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School school = returnDataObj as School;
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Id = school.Id;
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SchoolName = school.SchoolName;
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ClassNumber = school.ClassNumber;
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StudentNumber = school.StudentNumber;
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}
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/// <summary>
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/// 聚合函数
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/// 查询指定学校的所有学生
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/// </summary>
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[SqlFunction]
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public static void QuaryAvgStudent(int schoolId)
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{
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using (SqlConnection conn = new SqlConnection("Context Connection=true"))
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{
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conn.Open();
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string sqlText = "SELECT ISNULL(COUNT(*),0) AS StudentCount FROM dbo.Student where [SchoolId]=@SchoolId;";
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SqlParameter schoolIdPara = new SqlParameter()
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{
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ParameterName = "@SchoolId",
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Direction = ParameterDirection.Input,
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SqlDbType = SqlDbType.Int,
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Value = schoolId,
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};
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SqlCommand command = new SqlCommand()
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{
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Connection = conn,
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CommandText = sqlText,
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CommandType = CommandType.Text,
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};
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command.Parameters.Add(schoolIdPara);
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SqlContext.Pipe.ExecuteAndSend(command);
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conn.Close();
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}
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}
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#endregion
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}
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}
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