/* 2021.11.07 */ using Apewer; using System; using System.Collections.Generic; using System.Data; using System.Data.Common; using System.Text; using static Apewer.Source.OrmHelper; using System.Data.SqlClient; #if NETFRAMEWORK using System.Data.Sql; #endif namespace Apewer.Source { /// [Serializable] public class SqlClient : IDbClient { #region 变量、构造函数 private Timeout _timeout = null; private string _connectionstring = ""; /// 获取或设置日志记录。 public Logger Logger { get; set; } /// 超时设定。 public Timeout Timeout { get => _timeout; } /// 使用连接字符串创建数据库连接实例。 public SqlClient(string connectionString, Timeout timeout = null) { _timeout = timeout ?? Timeout.Default; _connectionstring = connectionString ?? ""; } /// 使用连接凭据创建数据库连接实例。 public SqlClient(string address, string store, string user, string pass, Timeout timeout = null) { if (timeout == null) timeout = Timeout.Default; var a = address ?? ""; var s = store ?? ""; var u = user ?? ""; var p = pass ?? ""; var cs = $"data source = {a}; initial catalog = {s}; "; if (string.IsNullOrEmpty(u)) cs += "integrated security = sspi; "; else { cs += $"user id = {u}; "; if (!string.IsNullOrEmpty(p)) cs += $"password = {p}; "; } cs += $"connection timeout = {timeout.Connect}; "; _timeout = timeout ?? Timeout.Default; _connectionstring = cs; } #endregion #region Ado - Connection private SqlConnection _db = null; /// 连接字符串。 public string ConnectionString { get => _connectionstring; } /// 获取当前的 SqlConnection 对象。 public IDbConnection Connection { get => _db; } /// 数据库是否已经连接。 public bool Online { get { if (_db == null) return false; return (_db.State == ConnectionState.Open); } } /// 连接数据库,若未连接则尝试连接,获取连接成功的状态。 public string Connect() { if (_db == null) { _db = new SqlConnection(); _db.ConnectionString = _connectionstring; } else { if (_db.State == ConnectionState.Open) return null; } try { _db.Open(); switch (_db.State) { case ConnectionState.Open: return null; default: return $"连接失败,当前处于 {_db.State} 状态。"; } } catch (Exception ex) { Logger.Error(nameof(SqlClient), "Connection", ex, _db.ConnectionString); Close(); return ex.Message; } } /// 关闭连接,并释放对象所占用的系统资源。 public void Close() { if (_db != null) { if (_transaction != null) { if (_autocommit) Commit(); else Rollback(); } _db.Close(); _db.Dispose(); _db = null; } } /// 关闭连接,释放对象所占用的系统资源,并清除连接信息。 public void Dispose() => Close(); #endregion #region Ado - Transaction private IDbTransaction _transaction = null; private bool _autocommit = false; /// 启动事务。 public string Begin(bool commit = true) => Begin(commit, null); /// 启动事务。 public string Begin(bool commit, Class isolation) { var connect = Connect(); if (connect.NotEmpty()) return connect; if (_transaction != null) return "存在已启动的事务,无法再次启动。"; try { _transaction = isolation ? _db.BeginTransaction(isolation.Value) : _db.BeginTransaction(); _autocommit = commit; return null; } catch (Exception ex) { Logger.Error(nameof(SqlClient), "Begin", ex.Message()); return ex.Message(); } } /// 提交事务。 public string Commit() { if (_transaction == null) return "事务不存在。"; try { _transaction.Commit(); RuntimeUtility.Dispose(_transaction); _transaction = null; return null; } catch (Exception ex) { RuntimeUtility.Dispose(_transaction); _transaction = null; Logger.Error(nameof(SqlClient), "Commit", ex.Message()); return ex.Message(); } } /// 从挂起状态回滚事务。 public string Rollback() { if (_transaction == null) return "事务不存在。"; try { _transaction.Rollback(); RuntimeUtility.Dispose(_transaction); _transaction = null; return null; } catch (Exception ex) { RuntimeUtility.Dispose(_transaction); _transaction = null; Logger.Error(nameof(SqlClient), "Rollback", ex.Message); return ex.Message(); } } #endregion #region Ado - SQL /// 查询。 public IQuery Query(string sql) => Query(sql, null); /// 查询。 public IQuery Query(string sql, IEnumerable parameters) { if (TextUtility.IsBlank(sql)) return Example.InvalidQueryStatement; var connected = Connect(); if (connected.NotEmpty()) return new Query(false, connected); try { using (var command = new SqlCommand()) { command.Connection = _db; command.CommandTimeout = _timeout.Query; command.CommandText = sql; if (parameters != null) { foreach (var p in parameters) { if (p != null) command.Parameters.Add(p); } } using (var dataset = new DataSet()) { using (var da = new SqlDataAdapter(command)) { var name = "table_" + Guid.NewGuid().ToString("n"); da.Fill(dataset, name); var table = dataset.Tables[name]; return new Query(table); } } } } catch (Exception exception) { Logger.Error(nameof(SqlClient), "Query", exception, sql); return new Query(exception); } } /// 执行。 public IExecute Execute(string sql) => Execute(sql, null); /// 执行单条 Transact-SQL 语句,并加入参数。 public IExecute Execute(string sql, IEnumerable parameters) { if (TextUtility.IsBlank(sql)) return Example.InvalidExecuteStatement; var connected = Connect(); if (connected.NotEmpty()) return new Execute(false, connected); var inTransaction = _transaction != null; if (!inTransaction) Begin(); try { using (var command = new SqlCommand()) { command.Connection = _db; command.Transaction = (SqlTransaction)_transaction; command.CommandTimeout = _timeout.Execute; command.CommandText = sql; if (parameters != null) { foreach (var parameter in parameters) { if (parameter != null) command.Parameters.Add(parameter); } } var rows = command.ExecuteNonQuery(); if (!inTransaction) Commit(); // todo 此处应该检查事务提交产生的错误。 return new Execute(true, rows); } } catch (Exception exception) { Logger.Error(nameof(SqlClient), "Execute", exception, sql); if (!inTransaction) Rollback(); return new Execute(exception); } } #endregion #region ORM /// 查询数据库中的所有表名。 public string[] TableNames() { var list = new List(); if (Connect().IsEmpty()) { var sql = "select [name] from [sysobjects] where [type] = 'u' order by [name]; "; var query = (Query)Query(sql); for (int r = 0; r < query.Rows; r++) { var cell = query.Text(r, 0); if (TextUtility.IsBlank(cell)) continue; list.Add(cell); } query.Dispose(); } return list.ToArray(); } /// 查询数据库实例中的所有数据库名。 public string[] StoreNames() { var list = new List(); if (Connect().IsEmpty()) { var sql = "select [name] from [master]..[sysdatabases] order by [name]; "; var query = (Query)Query(sql); for (int r = 0; r < query.Rows; r++) { var cell = query.Text(r, 0); if (TextUtility.IsBlank(cell)) continue; if (cell == "master") continue; if (cell == "model") continue; if (cell == "msdb") continue; if (cell == "tempdb") continue; list.Add(cell); } query.Dispose(); } return list.ToArray(); } /// 查询表中的所有列名。 public string[] ColumnNames(string tableName) { var list = new List(); if (Connect().IsEmpty()) { var table = TextUtility.AntiInject(tableName); var sql = TextUtility.Merge("select [name] from [syscolumns] where [id] = object_id('", table, "'); "); var query = (Query)Query(sql); for (int r = 0; r < query.Rows; r++) { var cell = query.Text(r, 0); if (TextUtility.IsBlank(cell)) continue; list.Add(cell); } query.Dispose(); } return list.ToArray(); } static string XType(int xtype) { switch (xtype) { case 34: return "image"; case 35: return "text"; case 36: return "uniqueidentifier"; case 48: return "tinyint"; case 52: return "smallint"; case 56: return "int"; case 58: return "smalldatetime"; case 59: return "real"; case 60: return "money"; case 61: return "datetime"; case 62: return "float"; case 98: return "sql_variant"; case 99: return "ntext"; case 104: return "bit"; case 106: return "decimal"; case 108: return "numeric"; case 122: return "smallmoney"; case 127: return "bigint"; case 165: return "varbinary"; case 167: return "varchar"; case 173: return "binary"; case 175: return "char"; case 189: return "timestamp"; case 231: return "nvarchar"; case 239: return "nchar"; case 241: return "xml"; } return null; } /// 获取列信息。 public ColumnInfo[] ColumnsInfo(string tableName) { if (tableName.IsEmpty()) throw new ArgumentNullException(nameof(tableName)); var sql = $"select name, xtype, length from syscolumns where id = object_id('{tableName}') "; using (var query = Query(sql)) { var ab = new ArrayBuilder(); for (var i = 0; i < query.Rows; i++) { var info = new ColumnInfo(); info.Name = query.Text(i, "name"); info.Type = XType(query.Int32(i, "xtype")); info.Length = query.Int32(i, "length"); ab.Add(info); } return ab.Export(); } } /// 创建表,当表不存在时创建表,当现存表中缺少模型中属性对应的列时增加列。成功时返回空字符串,发生异常时返回异常信息。 public string Initialize() where T : class, new() => Initialize(typeof(T)); /// 创建表,当表不存在时创建表,当现存表中缺少模型中属性对应的列时增加列。成功时返回空字符串,发生异常时返回异常信息。 public string Initialize(Type model) { var structure = TableStructure.Parse(model); if (structure == null) return "无法解析记录模型。"; // 连接数据库。 var connect = Connect(); if (connect.NotEmpty()) return connect; // 检查现存表。 var exists = false; var tables = TableNames(); if (tables.Length > 0) { var lower = structure.Name.ToLower(); foreach (var table in tables) { if (TextUtility.IsBlank(table)) continue; if (table.ToLower() == lower) { exists = true; break; } } } if (exists) { // 获取已存在的列名。 var columns = ColumnNames(structure.Name); if (columns.Length > 0) { var lower = new List(); foreach (var column in columns) { if (TextUtility.IsBlank(column)) continue; lower.Add(column.ToLower()); } columns = lower.ToArray(); } // 增加列。 foreach (var column in structure.Columns) { // 检查 Independent 特性。 if (structure.Independent && column.Independent) continue; // 去重。 var lower = column.Field.ToLower(); if (columns.Contains(lower)) continue; var type = Declaration(column); if (string.IsNullOrEmpty(type)) return TextUtility.Merge("类型 ", column.Type.ToString(), " 不受支持。"); var sql = TextUtility.Merge("alter table [", structure.Name, "] add ", type, "; "); var execute = Execute(sql); if (execute.Success == false) return execute.Message; } return TextUtility.Empty; } else { var sqlcolumns = new List(); foreach (var column in structure.Columns) { // 检查 Independent 特性。 if (structure.Independent && column.Independent) continue; var type = Declaration(column); if (!column.Independent && column.Property.Name == "Key") type = type + " primary key"; if (string.IsNullOrEmpty(type)) return TextUtility.Merge("类型 ", column.Type.ToString(), " 不受支持。"); sqlcolumns.Add(type); } var sql = TextUtility.Merge("create table [", structure.Name, "](", string.Join(", ", sqlcolumns.ToArray()), "); "); var execute = Execute(sql); if (execute.Success) return TextUtility.Empty; return execute.Message; } } /// 插入记录。返回错误信息。 public string Insert(object record, string table = null) { if (record == null) return "参数无效。"; FixProperties(record); var structure = TableStructure.Parse(record.GetType()); if (structure == null) return "无法解析记录模型。"; if (string.IsNullOrEmpty(table)) table = structure.Name; if (string.IsNullOrEmpty(table)) return "表名称无效。"; var ps = structure.CreateParameters(record, Parameter); var psc = ps.Length; if (psc < 1) return "数据模型不包含字段。"; var names = new List(psc); var values = new List(psc); foreach (var column in ps) { //names.Add(TextGenerator.Merge("[", column, "]")); names.Add(TextUtility.Merge(column)); values.Add("@" + column); } var sb = new StringBuilder(); sb.Append("insert into [", table, "](", string.Join(", ", names.ToArray()), ") "); sb.Append("values(", string.Join(", ", values.ToArray()), "); "); var sql = sb.ToString(); var execute = Execute(sql, ps); if (execute.Success) return TextUtility.Empty; return execute.Message; } /// 更新记录,实体中的 Key 属性不被更新。返回错误信息。 /// 无法更新带有 Independent 特性的模型(缺少 Key 属性)。 public string Update(IRecord record, string table = null) { if (record == null) return "参数无效。"; FixProperties(record); SetUpdated(record); var structure = TableStructure.Parse(record.GetType()); if (structure == null) return "无法解析记录模型。"; if (structure.Independent) return "无法更新带有 Independent 特性的模型。"; if (string.IsNullOrEmpty(table)) table = structure.Name; if (string.IsNullOrEmpty(table)) return "表名称无效。"; var ps = structure.CreateParameters(record, Parameter, "_key"); var psc = ps.Length; if (psc < 1) return "数据模型不包含字段。"; var items = new List(); foreach (var p in ps) { var pn = p.ParameterName; items.Add(TextUtility.Merge("[", pn, "] = @", pn)); } var key = record.Key.SafeKey(); var sql = TextUtility.Merge("update [", table, "] set ", string.Join(", ", items.ToArray()), " where [_key]='", key, "'; "); var execute = Execute(sql, ps); if (execute.Success) return TextUtility.Empty; return execute.Message; } /// 获取按指定语句查询到的所有记录。 public Result Query(Type model, string sql) => OrmHelper.Query(this, model, sql); /// 获取按指定语句查询到的所有记录。 public Result Query(string sql) where T : class, new() { var query = Query(sql); if (!query.Success) return new Result(query.Message); var records = query.Fill(); query.Dispose(); var result = new Result(records); return result; } /// 获取记录。 public Result Query(Type model, long flag = 0) => OrmHelper.Query(this, model, (tn) => { if (flag == 0) return $"select * from [{tn}]; "; return $"select * from [{tn}] where _flag={flag}; "; }); /// 获取记录。 public Result Query(long flag = 0) where T : class, IRecord, new() => OrmHelper.Query(this, (tn) => { if (flag == 0) return $"select * from [{tn}]; "; return $"select * from [{tn}] where _flag={flag}; "; }); /// 获取具有指定 Key 的记录。 public Result Get(Type model, string key, long flag = 0) => OrmHelper.Get(this, model, key, (tn, sk) => { if (flag == 0) return $"select top 1 * from [{tn}] _key='{sk}'; "; return $"select top 1 * from [{tn}] where _key='{sk}' and _key='{sk}'; "; }); /// 获取具有指定 Key 的记录。 public Result Get(string key, long flag = 0) where T : class, IRecord, new() => OrmHelper.Get(this, key, (tn, sk) => { if (flag == 0) return $"select top 1 * from [{tn}] _key='{sk}'; "; return $"select top 1 * from [{tn}] where _key='{sk}' and _key='{sk}'; "; }); /// 查询有效的 Key 值。 public Result Keys(Type model, long flag = 0) => OrmHelper.Keys(this, model, (tn) => { if (flag == 0) return $"select _key from [{tn}]; "; return $"select _key from [{tn}] where _flag={flag}; "; }); /// 查询有效的 Key 值。 public Result Keys(long flag = 0) where T : class, IRecord, new() => Keys(typeof(T), flag); #endregion #region public static #if NET20 || NET40 /// 枚举本地网络中服务器的名称。 public static SqlServerSource[] EnumerateServer() { var list = new List(); // 表中列名:ServerName、InstanceName、IsClustered、Version。 using (var query = new Query(SqlDataSourceEnumerator.Instance.GetDataSources())) { for (int i = 0; i < query.Rows; i++) { var item = new SqlServerSource(); item.ServerName = query.Text(i, "ServerName"); list.Add(item); } } return list.ToArray(); } #endif /// 指定的连接凭据是否符合连接要求,默认指定 master 数据库。 public static bool Proven(string address, string user, string pass) => Proven(address, "master", user, pass); /// 指定的连接凭据是否符合连接要求。 public static bool Proven(string address, string store, string user, string pass) { var a = string.IsNullOrEmpty(address); var s = string.IsNullOrEmpty(store); var u = string.IsNullOrEmpty(user); var p = string.IsNullOrEmpty(pass); if (a) return false; if (s) return false; if (u && !p) return false; return true; } /// 创建参数。 /// /// static SqlParameter Parameter(Parameter parameter) { if (parameter == null) throw new InvalidOperationException("参数无效。"); return Parameter(parameter.Name, parameter.Type, parameter.Size, parameter.Value); } /// 创建参数。 public static SqlParameter Parameter(string name, ColumnType type, int size, object value) { var vname = TextUtility.Trim(name); if (TextUtility.IsBlank(vname)) return null; var vtype = SqlDbType.BigInt; switch (type) { case ColumnType.Bytes: vtype = SqlDbType.Image; break; case ColumnType.Integer: vtype = SqlDbType.BigInt; break; case ColumnType.Float: vtype = SqlDbType.Float; break; case ColumnType.DateTime: vtype = SqlDbType.DateTime; break; case ColumnType.VarChar: case ColumnType.VarChar191: case ColumnType.VarCharMax: vtype = SqlDbType.VarChar; break; case ColumnType.NVarChar: case ColumnType.NVarChar191: case ColumnType.NVarCharMax: vtype = SqlDbType.NVarChar; break; case ColumnType.Text: vtype = SqlDbType.Text; break; case ColumnType.NText: vtype = SqlDbType.NText; break; default: throw new InvalidOperationException(TextUtility.Merge("类型 ", type.ToString(), " 不受支持。")); } var vsize = size; switch (type) { case ColumnType.VarChar: vsize = NumberUtility.Restrict(vsize, 0, 8000); break; case ColumnType.NVarChar: vsize = NumberUtility.Restrict(vsize, 0, 4000); break; case ColumnType.VarChar191: case ColumnType.NVarChar191: vsize = NumberUtility.Restrict(vsize, 0, 191); break; default: vsize = 0; break; } var vvalue = value; if (vvalue is string && vvalue != null && vsize > 0) { vvalue = TextUtility.Left((string)vvalue, vsize); } var parameter = new SqlParameter(); parameter.ParameterName = vname; parameter.SqlDbType = vtype; parameter.Value = vvalue; if (vsize > 0) parameter.Size = vsize; return parameter; } /// 创建参数。 public static SqlParameter Parameter(string name, SqlDbType type, int size, object value) { if (value is string && value != null && size > 0) { value = TextUtility.Left((string)value, (int)size); } var p = new SqlParameter(); p.ParameterName = name ?? ""; p.SqlDbType = type; p.Size = size; p.Value = value; return p; } /// 创建参数。 public static SqlParameter Parameter(string name, SqlDbType type, object value) { var p = new SqlParameter(); p.ParameterName = name ?? ""; p.SqlDbType = type; p.Value = value; return p; } static string Declaration(ColumnAttribute column) { var type = TextUtility.Empty; var vcolumn = column; var length = Math.Max(0, vcolumn.Length); switch (vcolumn.Type) { case ColumnType.Integer: type = "bigint"; break; case ColumnType.Float: type = "float"; break; case ColumnType.Bytes: type = "image"; break; case ColumnType.DateTime: type = "datetime"; break; case ColumnType.VarChar: type = TextUtility.Merge("varchar(", Math.Min(8000, length).ToString(), ")"); break; case ColumnType.VarChar191: type = TextUtility.Merge("varchar(191)"); break; case ColumnType.VarCharMax: type = TextUtility.Merge("varchar(max)"); break; case ColumnType.Text: type = TextUtility.Merge("text"); break; case ColumnType.NVarChar: type = TextUtility.Merge("nvarchar(", Math.Min(4000, length).ToString(), ")"); break; case ColumnType.NVarChar191: type = TextUtility.Merge("nvarchar(191)"); break; case ColumnType.NVarCharMax: type = TextUtility.Merge("nvarchar(max)"); break; case ColumnType.NText: type = TextUtility.Merge("ntext"); break; default: return TextUtility.Empty; } return TextUtility.Merge("[", vcolumn.Field, "] ", type); } #endregion } }