public static string SelectSQL(Type entityType, string where = "") { string selectSQL; if (!selectSQLCache.TryGetValue(entityType, out selectSQL)) //如果从缓存里面没有找到 { var columns = entityType.GetProperties().Where(item => { return(!EntityParser.IsIgnore(item)); }).Select(item => string.Format(" [{0}]", EntityParser.GetColumnName(item))); if (!columns.Any()) { throw new Exception(string.Format("类型{0}没有任何可以SELECT的列", entityType.FullName)); } selectSQL = string.Format("SELECT{0} FROM {1}", string.Join(",", columns), EntityParser.GetTableName(entityType) ); selectSQLCache.Add(entityType, selectSQL); } if (!string.IsNullOrEmpty(where)) { where = " WHERE " + where; } return(selectSQL + where); }
/// <summary> /// 根据主键删除一个实体 /// </summary> /// <typeparam name="TEntity"></typeparam> /// <param name="key">主键的值</param> public static void DeleteByKey <TEntity>(object key) where TEntity : SQLEntity { var keyInfo = EntityParser.GetKey(typeof(TEntity)); var keyName = keyInfo.KeyName; var sql = SqlBuilder.DeleteSQL(EntityParser.GetTableName(typeof(TEntity)), string.Format("{0} = @{0}", keyName)); SQLServerHelper.ExecuteNonQuery(sql, new SqlParameter("@" + keyName, key)); }
public static string InsertSQL(Type entityType) { string sql; if (!insertSQLCache.TryGetValue(entityType, out sql)) { StringBuilder insert = new StringBuilder(); var key = EntityParser.GetKey(entityType); if (!key.KeyConfig.UsePropertyForInsert) { insert.AppendLine(key.KeyConfig.KeyBeforeInsertSQL); } string tableName = EntityParser.GetTableName(entityType); insert.AppendFormat("INSERT INTO [{0}]", tableName); var properties = entityType.GetProperties().Where(item => !EntityParser.IsIgnore(item)).Select(item => { string columnSQL = EntityParser.GetColumnName(item); string valueSQL = ""; var config = EntityParser.GetColumnConfig(item); if (config.UsePropertyForInsert) { valueSQL = " @" + item.Name; } else { valueSQL = config.InsertSQL; } return(new KeyValuePair <string, string>(columnSQL, valueSQL)); }).Where(item => !string.IsNullOrEmpty(item.Value)); insert.AppendFormat("({0})", string.Join(",", properties.Select(item => item.Key))).AppendLine(); insert.AppendFormat("VALUES({0})", string.Join(",", properties.Select(item => item.Value))).AppendLine(); if (!key.KeyConfig.UsePropertyForInsert) { insert.Append("SELECT ").AppendLine(key.KeyConfig.KeyAfterInsertSQL); } insertSQLCache.Add(entityType, insert.ToString()); return(insert.ToString()); } return(sql); }
/// <summary> /// 将实体实例的属性的值更新到数据库中,必须指定主键 /// </summary> /// <typeparam name="TEntity"></typeparam> /// <param name="entity"></param> /// <param name="updateToEntity"></param> /// <returns></returns> public static TEntity Update <TEntity>(TEntity entity, bool updateToEntity = true) where TEntity : SQLEntity { if (entity.EntityState == EntityState.NotInitialized) { throw new Exception("要更新的实体尚未初始化"); } else if (entity.EntityState == EntityState.NotChanged) { return(entity); } else { var entityType = typeof(TEntity); var key = EntityParser.GetKey(entityType); //找到主键属性 if (key == null) { throw new Exception("在实体类中没有找主键属性"); } List <SqlParameter> parameters = new List <SqlParameter>(); var tableName = EntityParser.GetTableName(entityType); StringBuilder update = new StringBuilder(); update.AppendFormat("UPDATE [{0}] SET ", tableName); var flags = false; foreach (var propertyName in entity) //遍历更改的属性 { if (propertyName == key.PropertyName) { continue; } var propertyInfo = entityType.GetProperty(propertyName); if (propertyInfo == null || EntityParser.IsIgnore(propertyInfo)) //如果找不到属性或不映射到数据库 { continue; } var sqlPair = SqlBuilder.ColumnSqlForUpdate(entity, propertyInfo, parameters); //获取更新列值的sql语句 if (string.IsNullOrEmpty(sqlPair)) { continue; } else { string columnName = EntityParser.GetColumnName(propertyInfo); update.AppendFormat("{0} = {1}, ", columnName, sqlPair); flags = true; } } if (flags) { update.Remove(update.Length - 2, 2).AppendFormat(" "); } else { return(entity); } update.AppendFormat(" WHERE {0} = @{0}", key.KeyName); var keyValue = key.Key.GetValue(entity, null); //获取主键的值 parameters.Add(new SqlParameter("@" + key.PropertyName, keyValue)); SQLServerHelper.ExecuteNonQuery(update.ToString(), parameters.ToArray()); //更新到数据库 entity.EntityState = EntityState.NotChanged; //未更改 if (updateToEntity) { //SingleByKey(keyValue, entity); //从数据库刷新属性 RefreshEntity(entity); } } return(entity); }
/// <summary> /// 根据指定的条件删除多个实体 /// </summary> /// <typeparam name="TEntity"></typeparam> /// <param name="where">条件</param> /// <param name="pms">参数</param> public static void Delete <TEntity>(string where, params SqlParameter[] pms) where TEntity : SQLEntity { var sql = SqlBuilder.DeleteSQL(EntityParser.GetTableName(typeof(TEntity)), where); SQLServerHelper.ExecuteNonQuery(sql, pms); }