标签:sys sql语句 开发 query finally tab 执行方法 set 更新
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
namespace MCO.ADO.NET
{
class SqlServerHelper
{
#region 该类的核心代码
/// <summary>
/// 私有化构造器(单例模式开发数据库查询工具类)
/// </summary>
private SqlServerHelper() { }
/// <summary>
/// 程序执行前实例化一个数据库帮助类
/// </summary>
private static SqlServerHelper sqlServer = new SqlServerHelper();
/// <summary>
/// 数据库连接字符串
/// </summary>
private string connection;
/// <summary>
/// 数据库命令执行方法(SQL语句)
/// </summary>
private int Command(string sql)
{
SqlConnection conn = new SqlConnection(connection);
try
{
SqlCommand command = new SqlCommand(sql, conn);
conn.Open();
return command.ExecuteNonQuery();
}
catch
{
return 0;
}
finally
{
conn.Close();
}
}
/// <summary>
/// 查询(SQL语句)
/// </summary>
private DataTable GetList(string sql)
{
SqlConnection conn = new SqlConnection(connection);
try
{
SqlDataAdapter adapter = new SqlDataAdapter(sql, conn);
DataTable data = new DataTable();
adapter.Fill(data);
return data;
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
#endregion
/// <summary>
/// 创建该单例类的方法(数据库连接字符串)
/// </summary>
public static SqlServerHelper GetSqlServer(string connection)
{
sqlServer.connection = connection;
return sqlServer;
}
/// <summary>
/// 完全查询(表名, 字段) //表名和字段最好加上中括号[Id]
/// </summary>
public DataTable GetList(string tableName, string field)
{
string sql = string.Format("select {0} from {1}", field, tableName);
return GetList(sql);
}
/// <summary>
/// 条件查询(表名, 字段, 条件)
/// </summary>
public DataTable GetList(string tableName, string field, string where)
{
string sql = string.Format("select {0} form {1} where {2}", field, tableName, where);
return GetList(sql);
}
/// <summary>
/// 分页查询(表名, 字段, 条件, 主键, 页码, 条数)
/// </summary>
public DataTable GetList(string tableName, string field, string where, string idField, int page, int size)
{
string sql = string.Format("select top {0} {1} from {2} where {3} not in (select top {4} {5} from {6} where {7}) and ({8})",
size, field, tableName, idField, (page - 1) * size, idField, tableName, where, where
);
return GetList(sql);
}
/// <summary>
/// 排序查询(表名, 字段, 条件, 排序)
/// </summary>
public DataTable GetList(string tableName, string field, string where, string order)
{
string sql = string.Format("select {0} form {1} where {2} order by {3}", field, tableName, where, order);
return GetList(sql);
}
/// <summary>
/// 分页排序查询(表名, 字段, 条件, 主键, 页码, 条数, 排序)
/// </summary>
public DataTable GetList(string tableName, string field, string where, string idField, int page, int size, string order)
{
string sql = string.Format("select top {0} {1} from {2} where {3} not in (select top {4} {5} from {6} where {7}) and ({8}) order by {9}",
size, field, tableName, idField, (page - 1) * size, idField, tableName, where, where, order
);
return GetList(sql);
}
/// <summary>
/// 条件删除(表名, 条件) //返回受影响的行数, 0 表示失败
/// </summary>
public int Delete(string tableName, string where)
{
string sql = string.Format("delete from {0} where {1}", tableName, where);
return Command(sql);
}
/// <summary>
/// 条件修改(表名, 更新的数据, 条件)
/// </summary>
public int Update(string tableName, string updateData, string where)
{
string sql = string.Format("update {0} set {1} where {2}", tableName, updateData, where);
return Command(sql);
}
}
}
标签:sys sql语句 开发 query finally tab 执行方法 set 更新
原文地址:http://www.cnblogs.com/lovling/p/6441855.html