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/* 2019.9.20.0 */
#if NET40 || NET461
using Apewer;
using Apewer.Source;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using System.Data.Sql;
using System.Data.SqlClient;
using System.Text;
namespace Apewer.Source
{
/// <summary>用于快速连接 Microsoft SQL Server 数据库的辅助。</summary>
[Serializable]
public class SqlServer : IDatabase, IDisposable
{
#region 变量定义。
private SqlConnection _db = null;
private Timeout _timeout;
private string _connectionstring = "";
private string _address = "";
private string _store = "";
private string _user = "";
private string _pass = "";
#endregion
#region 构造函数。
/// <summary>创建空参数的数据库连接实例。</summary>
public SqlServer()
{
_timeout = Timeout.Default;
}
/// <summary>使用连接字符串创建数据库连接实例。</summary>
public SqlServer(string connectionString)
{
_timeout = Timeout.Default;
_connectionstring = connectionString ?? "";
}
/// <summary>使用连接凭据创建数据库连接实例。</summary>
/// <param name="address">服务器地址。</param>
/// <param name="store">数据库名称。</param>
public SqlServer(string address, string store)
{
_timeout = Timeout.Default;
_address = address ?? "";
_store = store ?? "";
UpdateConnectString();
}
/// <summary>使用连接凭据创建数据库连接实例。</summary>
/// <param name="address">服务器地址。</param>
/// <param name="store">数据库名称。</param>
/// <param name="user">用户名。</param>
/// <param name="pass">密码。</param>
public SqlServer(string address, string store, string user, string pass)
{
_timeout = Timeout.Default;
_address = address ?? "";
_store = store ?? "";
_user = user ?? "";
_pass = pass ?? "";
UpdateConnectString();
}
#endregion
#region 日志。
/// <summary>获取或设置日志记录。</summary>
public Logger Logger { get; set; }
private void Log(Action<Logger> action)
{
if (action == null) return;
var logger = Logger;
#if DEBUG
if (logger == null) logger = Logger.Default;
#endif
if (logger != null) action(logger);
}
private void LogError(string action, Exception ex, string addtion)
{
Log((logger) => logger.Error(this, "SQL Server", action, ex.GetType().FullName, ex.Message, addtion));
}
#endregion
#region 实现接口。
/// <summary>数据库是否已经连接。</summary>
public bool Online
{
get
{
if (_db == null) return false;
return (_db.State == ConnectionState.Open);
}
}
/// <summary>连接数据库,若未连接则尝试连接,获取连接成功的状态。</summary>
public bool Connect()
{
if (_db == null)
{
_db = new SqlConnection();
_db.ConnectionString = ConnectionString;
}
else
{
if (_db.State == ConnectionState.Open) return true;
}
try
{
_db.Open();
switch (_db.State)
{
case ConnectionState.Open: return true;
default: return false;
}
}
catch (Exception ex)
{
LogError("Connection", ex, _db.ConnectionString);
Close();
return false;
}
}
/// <summary>关闭连接,并释放对象所占用的系统资源。</summary>
public void Close()
{
if (_db != null)
{
_db.Close();
_db.Dispose();
_db = null;
}
}
/// <summary>关闭连接,释放对象所占用的系统资源,并清除连接信息。</summary>
public void Dispose()
{
Close();
_connectionstring = "";
_address = "";
_store = "";
_user = "";
_pass = "";
}
/// <summary>查询。</summary>
public IQuery Query(string sql) => Query(sql, null);
/// <summary>查询。</summary>
public IQuery Query(string sql, IEnumerable<IDataParameter> parameters)
{
if (string.IsNullOrWhiteSpace(sql)) return Example.InvalidQueryStatement;
const string tablename = "queryresult";
var connected = Connect();
if (!connected) return Example.InvalidQueryConnection;
var query = new Query();
try
{
var command = new SqlCommand();
command.Connection = _db;
command.CommandTimeout = Timeout.Query;
command.CommandText = sql;
if (parameters != null)
{
foreach (var parameter in parameters)
{
if (parameter != null) command.Parameters.Add(parameter);
}
}
using (var dataset = new DataSet())
{
using (var dataadapter = new SqlDataAdapter(sql, _db))
{
dataadapter.Fill(dataset, tablename);
query.Table = dataset.Tables[tablename];
}
}
command.Dispose();
query.Success = true;
}
catch (Exception exception)
{
LogError("Query", exception, sql);
query.Success = false;
query.Exception = exception;
}
return query;
}
/// <summary>执行。</summary>
public IExecute Execute(string sql) => Execute(sql, null);
/// <summary>执行单条 Transact-SQL 语句,并加入参数。</summary>
public IExecute Execute(string sql, IEnumerable<IDataParameter> parameters)
{
if (string.IsNullOrWhiteSpace(sql)) return Example.InvalidExecuteStatement;
var connected = Connect();
if (!connected) return Example.InvalidExecuteConnection;
var transaction = _db.BeginTransaction();
var execute = new Execute();
try
{
var command = new SqlCommand();
command.Connection = _db;
command.Transaction = transaction;
command.CommandTimeout = Timeout.Execute;
command.CommandText = sql;
if (parameters != null)
{
foreach (var parameter in parameters)
{
if (parameter != null) command.Parameters.Add(parameter);
}
}
execute.Rows += command.ExecuteNonQuery();
transaction.Commit();
command.Dispose();
execute.Success = true;
}
catch (Exception exception)
{
try { transaction.Rollback(); } catch { }
LogError("Execute", exception, sql);
execute.Success = false;
execute.Exception = exception;
}
try { transaction.Dispose(); } catch { }
return execute;
}
#endregion
#region 属性。
/// <summary>获取当前的 SqlConnection 对象。</summary>
public SqlConnection Connection
{
get { return _db; }
}
/// <summary>获取或设置连接字符串。</summary>
public string ConnectionString
{
get { return _connectionstring; }
set { _connectionstring = value ?? ""; _address = ""; _store = ""; _user = ""; _pass = ""; }
}
/// <summary>获取或设置数据库服务器的地址。</summary>
public string Address
{
get { return _address; }
set { _address = value ?? ""; UpdateConnectString(); }
}
/// <summary>获取或设置数据库名称。</summary>
public string Store
{
get { return _store; }
set { _store = value ?? ""; UpdateConnectString(); }
}
/// <summary>获取或设置用于连接数据库服务器的用户名,为空则使用 Windows 用户登录。</summary>
public string User
{
get { return _user; }
set { _user = value ?? ""; UpdateConnectString(); }
}
/// <summary>获取或设置用于连接数据库服务器的密码。</summary>
public string Pass
{
get { return _pass; }
set { _pass = value ?? ""; UpdateConnectString(); }
}
/// <summary>获取或设置超时。</summary>
public Timeout Timeout
{
get { return _timeout; }
set { _timeout = value; }
}
#endregion
#region 方法。
/// <summary>指定连接凭据后,是否符合连接要求。</summary>
public bool Proven()
{
return Proven(_address, _store, _user, _pass);
}
private void UpdateConnectString()
{
_connectionstring = "";
_connectionstring += "data source = " + _address + "; ";
_connectionstring += "initial catalog = " + _store + "; ";
if (string.IsNullOrEmpty(User))
{
_connectionstring += "integrated security = sspi; ";
}
else
{
_connectionstring += "user id = " + _user + "; ";
if (!string.IsNullOrEmpty(_pass)) _connectionstring += "password = " + _pass + "; ";
}
_connectionstring += "connection timeout = " + Timeout.Connect.ToString() + ";";
}
/// <summary>查询数据库中的所有表名。</summary>
public List<string> QueryAllTableNames()
{
var list = new List<string>();
if (Connect())
{
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;
}
/// <summary>查询数据库实例中的所有数据库名。</summary>
public List<string> QueryAllStoreNames()
{
var list = new List<string>();
if (Connect())
{
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;
}
/// <summary>查询表中的所有列名。</summary>
public List<string> QueryAllColumnNames(string tableName)
{
var list = new List<string>();
if (Connect())
{
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;
}
/// <summary>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。</summary>
public string CreateTable(Record model)
{
if (model == null) return "参数无效。";
var type = model.GetType();
var error = CreateTable(type);
return error;
}
/// <summary>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。</summary>
public string CreateTable(Type model)
{
var structure = null as TableStructure;
try { structure = TableStructure.ParseModel(model); }
catch (Exception exception) { return exception.Message; }
// 连接数据库。
if (!Connect()) return "连接数据库失败。";
// 检查现存表。
var exists = false;
var tables = QueryAllTableNames();
if (tables.Count > 0)
{
var lower = structure.Table.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 = QueryAllColumnNames(structure.Table);
if (columns.Count > 0)
{
var lower = new List<string>();
foreach (var column in columns)
{
if (TextUtility.IsBlank(column)) continue;
lower.Add(column.ToLower());
}
columns = lower;
}
// 增加列。
foreach (var column in structure.Columns.Values)
{
// 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 = GetColumnDeclaration(column);
if (type == TextUtility.EmptyString) return TextUtility.Merge("类型 ", column.Type.ToString(), " 不受支持。");
var sql = TextUtility.Merge("alter table [", structure.Table, "] add ", type, "; ");
var execute = Execute(sql);
if (execute.Success == false) return execute.Error;
}
return TextUtility.EmptyString;
}
else
{
var sqlcolumns = new List<string>();
foreach (var kvp in structure.Columns)
{
var property = kvp.Key;
var column = kvp.Value;
// 检查 Independent 特性。
if (structure.Independent && column.Independent) continue;
var type = GetColumnDeclaration(column);
if (!column.Independent && property == "Key") type = type + " primary key";
if (type == TextUtility.EmptyString) return TextUtility.Merge("类型 ", column.Type.ToString(), " 不受支持。");
sqlcolumns.Add(type);
}
var sql = TextUtility.Merge("create table [", structure.Table, "](", string.Join(", ", sqlcolumns), "); ");
var execute = Execute(sql);
if (execute.Success) return TextUtility.EmptyString;
return execute.Error;
}
}
/// <summary>插入记录。成功时候返回空字符串,发生异常时返回异常信息。</summary>
public string Insert(Record entity)
{
if (entity == null) return "参数无效。";
var type = entity.GetType();
entity.FixProperties();
var structure = null as TableStructure;
try { structure = TableStructure.ParseModel(entity); }
catch (Exception exception) { return exception.Message; }
var parameters = structure.CreateDataParameters(entity, CreateDataParameter);
var sql = GenerateInsertStatement(structure.Table, parameters);
var execute = Execute(sql, parameters);
if (execute.Success) return TextUtility.EmptyString;
return execute.Error;
}
/// <summary>
/// <para>更新记录,实体中的 Created 和 Key 属性不被更新。成功时返回空字符串,发生异常时返回异常信息。</para>
/// <para>无法更新拥有 Independent 特性的模型。</para>
/// </summary>
public string Update(Record entity)
{
if (entity == null) return "参数无效。";
var type = entity.GetType();
entity.FixProperties();
entity.Updated = ClockUtility.Lucid;
var structure = null as TableStructure;
try { structure = TableStructure.ParseModel(entity); }
catch (Exception exception) { return exception.Message; }
// 检查 Independent 特性。
if (structure.Independent) return "无法更新拥有 Independent 特性的模型。";
var parameters = structure.CreateDataParameters(entity, CreateDataParameter, "_created", "_key");
var sql = GenerateUpdateStatement(structure.Table, entity.Key, parameters);
var execute = Execute(sql, parameters);
if (execute.Success) return TextUtility.EmptyString;
return execute.Error;
}
/// <summary>获取具有指定 Key 的记录。</summary>
public Result<T> QueryRecord<T>(string key, long flag = 0) where T : Record
{
var k = TextUtility.RestrictGuid(key);
if (TextUtility.IsBlank(k) == false)
{
try
{
var type = typeof(T);
var ts = TableStructure.ParseModel(type);
var f = (flag == 0) ? TextUtility.EmptyString : TextUtility.Merge(" _flag=", flag.ToString(), " and");
var query = (Query)Query(TextUtility.Merge("select top 1 * from [", ts.Table, "] where", f, " _key='", k, "'; "));
var list = query.Fill<T>();
query.Dispose();
if (list.Count > 0) return new Result<T>(list[0]);
}
catch (Exception argException)
{
return new Result<T>(argException);
}
}
return new Result<T>(new Exception("参数无效。"));
}
/// <summary>获取记录。</summary>
public Result<List<T>> QueryRecords<T>(long flag = 0) where T : Record
{
try
{
var type = typeof(T);
var ts = TableStructure.ParseModel(type);
var f = (flag == 0) ? TextUtility.EmptyString : TextUtility.Merge(" where _flag=", flag.ToString());
var query = (Query)Query(TextUtility.Merge("select * from [", ts.Table, "]", f, "; "));
var list = query.Fill<T>();
query.Dispose();
return new Result<List<T>>(list);
}
catch (Exception argException)
{
return new Result<List<T>>(argException);
}
}
/// <summary>获取按指定语句查询到的所有记录。</summary>
public Result<List<T>> Query<T>(string sql) where T : Record
{
var query = (Query)Query(sql);
if (query.Exception == null)
{
var list = query.Fill<T>();
query.Dispose();
return new Result<List<T>>(list);
}
else
{
var result = new Result<List<T>>(query.Exception);
query.Dispose();
return result;
}
}
/// <summary>查询有效的 Key 值。</summary>
public Result<List<string>> QueryKeys(Type model, long flag = 0)
{
if (model != null)
{
try
{
var type = model;
var list = new List<string>();
var ts = TableStructure.ParseModel(type);
var f = (flag == 0) ? TextUtility.EmptyString : TextUtility.Merge(" where _flag=", flag.ToString());
var query = (Query)Query(TextUtility.Merge("select _key from [", ts.Table, "]", f, "; "));
for (var r = 0; r < query.Rows; r++)
{
var cell = TextUtility.Trim(query.Text(r));
if (cell.Length > 0) list.Add(cell);
}
query.Dispose();
return new Result<List<string>>(list);
}
catch (Exception argException)
{
return new Result<List<string>>(argException);
}
}
return new Result<List<string>>(new Exception("参数无效。"));
}
/// <summary>查询有效的 Key 值。</summary>
public Result<List<string>> QueryKeys<T>(long flag = 0) where T : Record
{
try
{
var type = typeof(T);
var ts = TableStructure.ParseModel(type);
var f = (flag == 0) ? TextUtility.EmptyString : TextUtility.Merge(" where _flag=", flag.ToString());
var query = (Query)Query(TextUtility.Merge("select _key from [", ts.Table, "]", f, "; "));
var list = new List<string>();
for (var r = 0; r < query.Rows; r++)
{
var cell = TextUtility.Trim(query.Text(r));
if (cell.Length > 0) list.Add(cell);
}
query.Dispose();
return new Result<List<string>>(list);
}
catch (Exception argException)
{
return new Result<List<string>>(argException);
}
}
#endregion
#region 静态方法。
private static string GetColumnDeclaration(ColumnAttribute column)
{
var type = TextUtility.EmptyString;
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.Binary:
type = "image";
break;
case ColumnType.DateTime:
type = "datetime";
break;
case ColumnType.VarChar:
type = TextUtility.Merge("varchar(", Math.Min(8000, length).ToString(), ")");
break;
case ColumnType.VarChar255:
type = TextUtility.Merge("varchar(255)");
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.NVarChar255:
type = TextUtility.Merge("nvarchar(255)");
break;
case ColumnType.NVarCharMax:
type = TextUtility.Merge("nvarchar(max)");
break;
case ColumnType.NText:
type = TextUtility.Merge("ntext");
break;
default:
return TextUtility.EmptyString;
}
return TextUtility.Merge("[", vcolumn.Field, "] ", type);
}
/// <summary>创建参数。</summary>
/// <exception cref="ArgumentNullException"></exception>
/// <exception cref="InvalidOperationException"></exception>
internal static SqlParameter CreateDataParameter(Parameter parameter)
{
if (parameter == null) throw new InvalidOperationException("参数无效。");
return CreateDataParameter(parameter.Name, parameter.Type, parameter.Size, parameter.Value);
}
/// <summary>创建参数。</summary>
public static SqlParameter CreateDataParameter(string name, ColumnType type, Int32 size, object value)
{
var vname = TextUtility.Trim(name);
if (TextUtility.IsBlank(vname)) return null;
var vtype = SqlDbType.BigInt;
switch (type)
{
case ColumnType.Binary:
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.VarChar255:
case ColumnType.VarCharMax:
vtype = SqlDbType.VarChar;
break;
case ColumnType.NVarChar:
case ColumnType.NVarChar255:
case ColumnType.NVarCharMax:
vtype = SqlDbType.VarChar;
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.RestrictValue(vsize, 0, 8000);
break;
case ColumnType.NVarChar:
vsize = NumberUtility.RestrictValue(vsize, 0, 4000);
break;
case ColumnType.VarChar255:
case ColumnType.NVarChar255:
vsize = NumberUtility.RestrictValue(vsize, 0, 255);
break;
default:
vsize = 0;
break;
}
var vvalue = value;
if (vvalue is string && vvalue != null && vsize > 0)
{
vvalue = TextUtility.RestrictLength((string)vvalue, vsize);
}
var parameter = new SqlParameter();
parameter.ParameterName = vname;
parameter.SqlDbType = vtype;
parameter.Value = vvalue;
if (vsize > 0) parameter.Size = vsize;
return parameter;
}
/// <summary>创建参数。</summary>
public static SqlParameter CreateDataParameter(String name, SqlDbType type, Int32 size, Object value)
{
if (value is string && value != null && size > 0)
{
value = TextUtility.RestrictLength((string)value, (int)size);
}
var p = new SqlParameter();
p.ParameterName = name ?? "";
p.SqlDbType = type;
p.Size = size;
p.Value = value;
return p;
}
/// <summary>创建参数。</summary>
public static SqlParameter CreateDataParameter(String name, SqlDbType type, Object value)
{
var p = new SqlParameter();
p.ParameterName = name ?? "";
p.SqlDbType = type;
p.Value = value;
return p;
}
///// <summary>枚举本地网络中服务器的名称。</summary>
//public static List<string> EnumerateServer()
//{
// // 表中列名:ServerName、InstanceName、IsClustered、Version。
// var table = SqlDataSourceEnumerator.Instance.GetDataSources();
// var query = new Query();
// query.Success = table != null;
// query.Table = table;
// var list = new List<string>();
// for (int i = 0; i < query.Rows; i++)
// {
// var sn = query.Text(i, "ServerName");
// if (!string.IsNullOrEmpty(sn)) list.Add(sn);
// }
// query.Dispose();
// return list;
//}
/// <summary>指定的连接凭据是否符合连接要求。</summary>
public static bool Proven(SqlServer sqlserver)
{
return Proven(sqlserver._address, sqlserver._store, sqlserver._user, sqlserver._pass);
}
/// <summary>指定的连接凭据是否符合连接要求,默认指定 master 数据库。</summary>
public static bool Proven(string address, string user, string pass)
{
return Proven(address, "master", user, pass);
}
/// <summary>指定的连接凭据是否符合连接要求。</summary>
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;
}
#endregion
#region Linq Utility
private static string GetParameterName(string parameter)
{
var name = TextUtility.AntiInject(parameter, 255);
if (name.StartsWith("@") && name.Length > 1)
{
name = name.Substring(1, name.Length - 1);
}
return name;
}
private static string GetParameterName(IDataParameter parameter)
{
var name = TextUtility.EmptyString;
if (parameter != null)
{
name = GetParameterName(parameter.ParameterName);
}
return name;
}
private static List<string> GetParametersNames(IEnumerable<IDataParameter> parameters)
{
var columns = new List<string>();
if (parameters != null)
{
foreach (var parameter in parameters)
{
var name = GetParameterName(parameter);
var isblank = TextUtility.IsBlank(name);
if (isblank) continue;
columns.Add(name);
}
}
return columns;
}
private static string GenerateInsertStatement(string table, List<string> columns)
{
var result = TextUtility.EmptyString;
var vtable = TextUtility.AntiInject(table, 255);
if (columns != null && !TextUtility.IsBlank(vtable))
{
var count = 0;
var names = new List<string>();
var values = new List<string>();
foreach (var column in columns)
{
//names.Add(TextGenerator.Merge("[", column, "]"));
names.Add(TextUtility.Merge(column));
values.Add("@" + column);
count += 1;
}
var text = new StringBuilder();
if (count > 0)
{
text.Append("insert into [", vtable, "](", string.Join(", ", names), ") ");
text.Append("values(", string.Join(", ", values), "); ");
}
result = text.ToString();
}
return result;
}
private static string GenerateUpdateStatement(string table, string key, List<string> columns)
{
var result = TextUtility.EmptyString;
var vtable = TextUtility.AntiInject(table, 255);
var vkey = TextUtility.AntiInject(key, 255);
if (columns != null && !TextUtility.IsBlank(vtable) && !TextUtility.IsBlank(vkey))
{
var items = new List<string>();
foreach (var column in columns)
{
items.Add(TextUtility.Merge("[", column, "]=@", column));
}
if (items.Count > 0)
{
result = TextUtility.Merge("update [", vtable, "] set ", string.Join(", ", items), " where [_key]='", vkey, "'; ");
}
}
return result;
}
/// <summary>生成 INSERT INTO 语句。表名必须有效,无有效参数时将获取空结果。</summary>
/// <exception cref="System.ArgumentException"></exception>
/// <exception cref="System.ArgumentNullException"></exception>
public static string GenerateInsertStatement(string table, IEnumerable<IDataParameter> parameters)
{
if (table == null) throw new ArgumentNullException("argTable");
var vtable = TextUtility.AntiInject(table, 255);
if (TextUtility.IsBlank(vtable)) throw new ArgumentException("表名无效。", "argTable");
var vcolumns = GetParametersNames(parameters);
if (vcolumns.Count < 1) return TextUtility.EmptyString;
return GenerateInsertStatement(vtable, vcolumns);
}
/// <summary>生成 UPDATE 语句,键字段名为“_key”。表名必须有效,键值必须有效,无有效参数时将获取空结果。</summary>
/// <exception cref="System.ArgumentException"></exception>
/// <exception cref="System.ArgumentNullException"></exception>
public static string GenerateUpdateStatement(string table, string key, IEnumerable<IDataParameter> parameters)
{
if (table == null) throw new ArgumentNullException("argTable");
var vtable = TextUtility.AntiInject(table, 255);
if (TextUtility.IsBlank(vtable)) throw new ArgumentException("表名无效。", "argTable");
if (key == null) throw new ArgumentNullException("argKey");
var vkey = TextUtility.AntiInject(key, 255);
if (TextUtility.IsBlank(vkey)) throw new ArgumentException("键值无效。", "argKey");
var vcolumns = GetParametersNames(parameters);
if (vcolumns.Count < 1) return TextUtility.EmptyString;
return GenerateUpdateStatement(vtable, vkey, vcolumns);
}
#endregion
}
}
#endif