Dapper 是一款非常不错的轻型 ORM 框架,使用起来非常方便,经常使用 EF 框架的人几乎感觉不到差别,下面是自己写的 Sqlite 通用帮助类;
1> 数据连接类;
public class SQLiteBaseRepository { public static string DbFile { get { return Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "VideoInfo.db"); } } public static SQLiteConnection SimpleDbConnection() { string connString = "Data Source=" + DbFile + ";Pooling=True;Max Pool Size=10;FailIfMissing=True;Journal Mode=Off;Synchronous = OFF"; return new SQLiteConnection(connString); } }
2> 数据库访问帮助类
public class SQLiteDbHelper : IDisposable { /// <summary> /// 常量; /// </summary> const string INSERT_TABLE_ITEM_VALUE = "insert into {0} ({1}) values ({2})"; const string DELETE_TABLE_WHERE = "delete from {0} where {1}"; const string UPDATE_TABLE_EDITITEM = "update {0} set {1}"; const string UPDATE_TABLE_EDITITEM_WHERE = "update {0} set {1} where {2}"; const string Query_ITEM_TABLE_WHERE = "select {0} from {1} where {2}"; private SQLiteConnection conn; public SQLiteDbHelper() { conn = openDataConnection(); } /// <summary> /// 打开数据库链接; /// </summary> /// <returns></returns> private SQLiteConnection openDataConnection() { var conn = SqLiteBaseRepository.SimpleDbConnection(); if (conn.State == ConnectionState.Closed) { conn.Open(); } return conn; } /// <summary> /// 1.1 新增实体; /// </summary> /// <typeparam name="T">实体类</typeparam> /// <param name="model">实体</param> /// <param name="autoPrimaryKey">自增主键名称</param> /// <returns></returns> public int Add<T>(T model, string autoPrimaryKey = "id") { var insertSql = GetInsertSql<T>(model,autoPrimaryKey); return conn.Execute(insertSql); } /// <summary> /// 批量新增 /// </summary> /// <typeparam name="T">实休类</typeparam> /// <param name="addData">实体数据列表</param> /// <param name="autoPrimaryKey">自增主键名称</param> /// <returns></returns> public int Adds<T>(List<T> models, string autoPrimaryKey = "id") { var type = typeof(T); int resultN = 0; var transaction = conn.BeginTransaction(); try { models.ForEach(d => { var insertSql = GetInsertSql<T>(d); resultN += conn.Execute(insertSql); }); transaction.Commit(); } catch (Exception) { resultN = 0; transaction.Rollback(); } return resultN; } /// <summary> /// 删除 /// </summary> /// <typeparam name="T">实体类</typeparam> /// <param name="where">删除条件</param> /// <returns></returns> public int Delete<T>(string where) { var type = typeof(T); string sqlStr = string.Format(DELETE_TABLE_WHERE, type.Name, where); return conn.Execute(sqlStr); } /// <summary> /// 删除 /// </summary> /// <param name="tableName"></param> /// <param name="where"></param> /// <returns></returns> public int Delete(string tableName, string where) { string sqlStr = string.Format(DELETE_TABLE_WHERE,tableName,where); return conn.Execute(sqlStr); } /// <summary> /// 修改; /// </summary> /// <typeparam name="T">实体 Type </typeparam> /// <param name="model">实体</param> /// <param name="where">修改条件</param> /// <param name="attrs">要修改的实休属性数组</param> /// <returns></returns> public int Edit<T>(T model, string where, params string[] attrs) { var sqlStr = GetUpdateSql<T>(model, where, attrs); return conn.Execute(sqlStr); } /// <summary> /// 根据条件查询单一实体; /// </summary> /// <typeparam name="T">实体类</typeparam> /// <param name="where">查询条件;</param> /// <param name="attrs">要查询的字段(传入 * 为查询所有字段。)</param> /// <returns></returns> public T QeryByWhere<T>(string where,params string[] attrs) { Type type = typeof(T); string item = attrs.Length == 1 && attrs[0] == "*" ? "*" : string.Join(",", attrs); var sqlStr = string.Format(Query_ITEM_TABLE_WHERE, item, type.Name, where); return conn.Query<T>(sqlStr).FirstOrDefault(); } /// <summary> /// 根据条件查询符合条件的所有实体; /// </summary> /// <typeparam name="T"></typeparam> /// <param name="where"></param> /// <returns></returns> public List<T> QueryMultiByWhere<T>(string where) { Type type = typeof(T); var sqlStr = string.Format(Query_ITEM_TABLE_WHERE, "*", type.Name, where); return conn.Query<T>(sqlStr).ToList(); } /// <summary> /// 生成新增 sql 语句; /// </summary> /// <typeparam name="T"></typeparam> /// <param name="model"></param> /// <param name="autoPrimaryKey"></param> /// <returns></returns> private string GetInsertSql<T>(T model, string autoPrimaryKey = "id") { Type t = typeof(T); var propertyInfo = t.GetProperties(); var proDic = propertyInfo.Where(s => !s.Name.Equals(autoPrimaryKey, StringComparison.InvariantCultureIgnoreCase)) .Select(s => new { key = s.Name, value = GetValue<T>(s, model) }) .ToDictionary(s => s.key, s => s.value); proDic = proDic.Where(s => s.Value != "‘‘").ToDictionary(s => s.Key, s => s.Value); var items = string.Join(",", proDic.Keys); var values = string.Join(",", proDic.Values); return string.Format(INSERT_TABLE_ITEM_VALUE,t.Name,items,values); } /// <summary> /// 获取属性值; /// </summary> /// <typeparam name="T">实体类</typeparam> /// <param name="info">字段属性信息</param> /// <param name="model">实体</param> /// <returns></returns> private string GetValue<T>(PropertyInfo info,T model) { Type type = info.PropertyType; var tempStr = string.Empty; if (type == typeof(string)) { tempStr = string.Format("‘{0}‘",info.GetValue(model)); return tempStr; } if (type == typeof(DateTime)) { tempStr = string.Format("‘{0}‘", ((DateTime)info.GetValue(model)).ToString("s")); return tempStr; } if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>)) { var types = type.GetGenericArguments(); if (types[0] == typeof(DateTime)) { tempStr = string.Format("‘{0}‘", ((DateTime)info.GetValue(model)).ToString("s")); } tempStr = string.Format("‘{0}‘",info.GetValue(model)); return tempStr; } tempStr = info.GetValue(model).ToString(); return tempStr; } /// <summary> /// 生成更新 sql 语句; /// </summary> /// <typeparam name="T"></typeparam> /// <param name="model"></param> /// <param name="pro"></param> /// <param name="attrs"></param> /// <returns></returns> private string GetUpdateSql<T>(T model,string where, params string[] attrs) { Type t = typeof(T); var propertyInfo = t.GetProperties(); var updateInfo = propertyInfo .Where(s => attrs.Contains(s.Name)) .Select(s => { if (s.PropertyType == typeof(string)) { return string.Format("{0}=‘{1}‘",s.Name,s.GetValue(model)); } if (s.PropertyType == typeof(DateTime)) { return string.Format("{0}=‘{1}‘",s.Name,((DateTime)s.GetValue(model)).ToString("s")); } if (s.PropertyType.IsGenericType && s.PropertyType.GetGenericTypeDefinition() == typeof(Nullable<>)) { Type[] types = s.PropertyType.GetGenericArguments(); if (types[0] == typeof(DateTime)) { return string.Format("{0}=‘{1}‘", s.Name, ((DateTime)s.GetValue(model)).ToString("s")); } return string.Format("{0}={1}", s.Name, s.GetValue(model)); } return string.Format("{0}={1}", s.Name, s.GetValue(model)); }) .ToArray(); var setStr = string.Join(",",updateInfo); var sqlStr = string.Format(UPDATE_TABLE_EDITITEM_WHERE, t.Name, setStr, where); return sqlStr; } /// <summary> /// 释放数据连接; /// </summary> public void Dispose() { conn.Close(); conn.Dispose(); } }
时间: 2024-10-06 00:16:20