dapper hepler帮助类
using Dapper; using DapperExtensions; using System.Collections.Generic; using System.Configuration; using System.Data; using System.Data.SqlClient; using System.Linq; using System.Threading.Tasks; namespace DBLibrarys.DBHelper { /// <summary> /// 数据库操作类 /// </summary> public class SqlDapperHelper { static string connStrRead = ConfigurationManager.ConnectionStrings["Read"].ConnectionString; static string connStrWrite = ConfigurationManager.ConnectionStrings["Write"].ConnectionString; static int commandTimeout = 30; public static IDbConnection GetConnection(bool useWriteConn) { if (useWriteConn) return new SqlConnection(connStrWrite); return new SqlConnection(connStrRead); } public static SqlConnection GetOpenConnection() { var conn = new SqlConnection(connStrWrite); conn.Open(); return conn; } /// <summary> /// 执行sql返回一个对象 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="sql"></param> /// <param name="param"></param> /// <param name="useWriteConn"></param> /// <returns></returns> public static T ExecuteReaderReturnT<T>(string sql, object param = null, bool useWriteConn = false, IDbTransaction transaction = null) { if (transaction == null) { using (IDbConnection conn = GetConnection(useWriteConn)) { conn.Open(); return conn.QueryFirstOrDefault<T>(sql, param, commandTimeout: commandTimeout); } } else { var conn = transaction.Connection; return conn.QueryFirstOrDefault<T>(sql, param, commandTimeout: commandTimeout, transaction: transaction); } } /// <summary> /// 执行sql返回多个对象 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="sql"></param> /// <param name="param"></param> /// <param name="useWriteConn"></param> /// <returns></returns> public static List<T> ExecuteReaderReturnList<T>(string sql, object param = null, bool useWriteConn = false, IDbTransaction transaction = null) { using (IDbConnection conn = GetConnection(useWriteConn)) { conn.Open(); return conn.Query<T>(sql, param, commandTimeout: commandTimeout, transaction: transaction).ToList(); } } /// <summary> /// 执行sql返回一个对象--异步 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="sql"></param> /// <param name="param"></param> /// <param name="useWriteConn"></param> /// <returns></returns> public static async Task<T> ExecuteReaderRetTAsync<T>(string sql, object param = null, bool useWriteConn = false) { using (IDbConnection conn = GetConnection(useWriteConn)) { conn.Open(); return await conn.QueryFirstOrDefaultAsync<T>(sql, param, commandTimeout: commandTimeout).ConfigureAwait(false); } } /// <summary> /// 执行sql返回多个对象--异步 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="sql"></param> /// <param name="param"></param> /// <param name="useWriteConn"></param> /// <returns></returns> public static async Task<List<T>> ExecuteReaderRetListAsync<T>(string sql, object param = null, bool useWriteConn = false) { using (IDbConnection conn = GetConnection(useWriteConn)) { conn.Open(); var list = await conn.QueryAsync<T>(sql, param, commandTimeout: commandTimeout).ConfigureAwait(false); return list.ToList(); } } /// <summary> /// 执行sql,返回影响行数 /// </summary> /// <param name="sql"></param> /// <param name="param"></param> /// <param name="transaction"></param> /// <returns></returns> public static int ExecuteSqlInt(string sql, object param = null, IDbTransaction transaction = null) { if (transaction == null) { using (IDbConnection conn = GetConnection(true)) { conn.Open(); return conn.Execute(sql, param, commandTimeout: commandTimeout, commandType: CommandType.Text); } } else { var conn = transaction.Connection; return conn.Execute(sql, param, transaction: transaction, commandTimeout: commandTimeout, commandType: CommandType.Text); } } /// <summary> /// 执行sql,返回影响行数--异步 /// </summary> /// <param name="sql"></param> /// <param name="param"></param> /// <param name="transaction"></param> /// <returns></returns> public static async Task<int> ExecuteSqlIntAsync(string sql, object param = null, IDbTransaction transaction = null) { if (transaction == null) { using (IDbConnection conn = GetConnection(true)) { conn.Open(); return await conn.ExecuteAsync(sql, param, commandTimeout: commandTimeout, commandType: CommandType.Text).ConfigureAwait(false); } } else { var conn = transaction.Connection; return await conn.ExecuteAsync(sql, param, transaction: transaction, commandTimeout: commandTimeout, commandType: CommandType.Text).ConfigureAwait(false); } } /// <summary> /// 根据id获取实体 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="id"></param> /// <param name="transaction"></param> /// <param name="useWriteConn"></param> /// <returns></returns> public static T GetById<T>(int id, IDbTransaction transaction = null, bool useWriteConn = false) where T : class { if (transaction == null) { using (IDbConnection conn = GetConnection(useWriteConn)) { conn.Open(); return conn.Get<T>(id, commandTimeout: commandTimeout); } } else { var conn = transaction.Connection; return conn.Get<T>(id, transaction: transaction, commandTimeout: commandTimeout); } } /// <summary> /// 根据id获取实体--异步 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="id"></param> /// <param name="transaction"></param> /// <param name="useWriteConn"></param> /// <returns></returns> public static async Task<T> GetByIdAsync<T>(int id, IDbTransaction transaction = null, bool useWriteConn = false) where T : class { if (transaction == null) { using (IDbConnection conn = GetConnection(useWriteConn)) { conn.Open(); return await conn.GetAsync<T>(id, commandTimeout: commandTimeout); } } else { var conn = transaction.Connection; return await conn.GetAsync<T>(id, transaction: transaction, commandTimeout: commandTimeout); } } /// <summary> /// 插入实体 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="item"></param> /// <param name="transaction"></param> /// <returns></returns> public static string ExecuteInsert<T>(T item, IDbTransaction transaction = null) where T : class { if (transaction == null) { using (IDbConnection conn = GetConnection(true)) { conn.Open(); var res = conn.Insert<T>(item, commandTimeout: commandTimeout); return res; } } else { var conn = transaction.Connection; return conn.Insert(item, transaction: transaction, commandTimeout: commandTimeout); } } /// <summary> /// 批量插入实体 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="list"></param> /// <param name="transaction"></param> public static void ExecuteInsertList<T>(IEnumerable<T> list, IDbTransaction transaction = null) where T : class { if (transaction == null) { using (IDbConnection conn = GetConnection(true)) { conn.Open(); conn.Insert<T>(list, commandTimeout: commandTimeout); } } else { var conn = transaction.Connection; conn.Insert(list, transaction: transaction, commandTimeout: commandTimeout); } } /// <summary> /// 更新单个实体 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="item"></param> /// <param name="transaction"></param> /// <returns></returns> public static bool ExecuteUpdate<T>(T item, IDbTransaction transaction = null) where T : class { if (transaction == null) { using (IDbConnection conn = GetConnection(true)) { conn.Open(); return conn.Update(item, commandTimeout: commandTimeout); } } else { var conn = transaction.Connection; return conn.Update(item, transaction: transaction, commandTimeout: commandTimeout); } } /// <summary> /// 批量更新实体 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="item"></param> /// <param name="transaction"></param> /// <returns></returns> public static bool ExecuteUpdateList<T>(List<T> item, IDbTransaction transaction = null) where T : class { if (transaction == null) { using (IDbConnection conn = GetConnection(true)) { conn.Open(); return conn.Update(item, commandTimeout: commandTimeout); } } else { var conn = transaction.Connection; return conn.Update(item, transaction: transaction, commandTimeout: commandTimeout); } } /// <summary> /// 分页查询 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="sql">主sql 不带 order by</param> /// <param name="sort">排序内容 id desc,add_time asc</param> /// <param name="pageIndex">第几页</param> /// <param name="pageSize">每页多少条</param> /// <param name="useWriteConn">是否主库</param> /// <returns></returns> public static List<T> ExecutePageList<T>(string sql, string sort, int pageIndex, int pageSize, bool useWriteConn = false, object param = null) { string pageSql = @"SELECT TOP {0} * FROM (SELECT ROW_NUMBER() OVER (ORDER BY {1}) _row_number_,* FROM ({2})temp )temp1 WHERE temp1._row_number_>{3} ORDER BY _row_number_"; string execSql = string.Format(pageSql, pageSize, sort, sql, pageSize * (pageIndex - 1)); using (IDbConnection conn = GetConnection(useWriteConn)) { conn.Open(); return conn.Query<T>(execSql, param, commandTimeout: commandTimeout).ToList(); } } } }