/// <summary> /// 获取 DateTimeOffset 类型的 SQL 片断 /// </summary> /// <param name="value">值</param> /// <param name="dbType">数据类型</param> /// <param name="scale">小数位</param> /// <returns></returns> protected override string GetSqlValueOfDateTimeOffset(object value, object dbType, int?scale) { // 默认精度6 string format = "yyyy-MM-dd HH:mm:ss.ffffff"; if (NpgUtils.IsDateTimeOffset(dbType)) { string s = string.Empty; if (scale != null && scale.Value > 0) { s = string.Empty.PadLeft(scale.Value > 6 ? 6 : scale.Value, 'f'); } if (!string.IsNullOrEmpty(s)) { format = string.Format("yyyy-MM-dd HH:mm:ss.{0}", s); } } string myDateTime = ((DateTimeOffset)value).DateTime.ToString(format); string myOffset = ((DateTimeOffset)value).Offset.ToString(@"hh\:mm"); myOffset = string.Format("{0}{1}", ((DateTimeOffset)value).Offset < TimeSpan.Zero ? '-' : '+', myOffset); string result = string.Format("'{0}{1}'::TIMESTAMPTZ ", myDateTime, myOffset); return(result); // Npgsql 的显示都是以本地时区显示的?### }
/// <summary> /// 获取 DatetTime 类型的 SQL 片断 /// </summary> /// <param name="value">值</param> /// <param name="dbType">数据类型</param> /// <param name="scale">小数位</param> /// <returns></returns> protected override string GetSqlValueOfDateTime(object value, object dbType, int?scale) { // 默认精度6 string format = "yyyy-MM-dd HH:mm:ss.ffffff"; if (NpgUtils.IsDate(dbType)) { format = "yyyy-MM-dd"; } else if (NpgUtils.IsDateTime(dbType) || NpgUtils.IsDateTime2(dbType)) { string s = string.Empty; if (scale != null && scale.Value > 0) { s = string.Empty.PadLeft(scale.Value > 6 ? 6 : scale.Value, 'f'); } if (!string.IsNullOrEmpty(s)) { format = string.Format("yyyy-MM-dd HH:mm:ss.{0}", s); } } string date = ((DateTime)value).ToString(format); string result = string.Format("'{0}'::TIMESTAMP", date); return(result); }
/// <summary> /// 访问 EndWidth 方法 /// </summary> /// <param name="m">方法表达式</param> protected override Expression VisitEndsWith(MethodCallExpression m) { if (m != null) { _visitor.Visit(m.Object); if (this.NotOperands != null && this.NotOperands.Contains(m)) { _builder.Append(" NOT"); } _builder.Append(" LIKE "); if (m.Arguments[0].CanEvaluate()) { ColumnAttribute column = null; bool isUnicode = NpgUtils.IsUnicode(_visitedMark.Current, out column); string value = _constor.GetSqlValue(m.Arguments[0].Evaluate().Value, _builder.TranslateContext, column); if (!_builder.Parameterized && value != null) { value = value.TrimStart('N').Trim('\''); } if (_builder.Parameterized) { _builder.Append("('%' || "); _builder.Append(value); _builder.Append(")"); } else { if (isUnicode) { _builder.Append('N'); } _builder.Append("'%"); _builder.Append(value); _builder.Append("'"); } } else { _builder.Append("('%' || "); _visitor.Visit(m.Arguments[0]); _builder.Append(")"); } } return(m); }
/// <summary> /// 设置命令参数对象的 DbType属性 /// </summary> /// <param name="parameter">命令参数对象</param> /// <param name="dbType">DbType属性</param> public static void DbType(this NpgsqlParameter parameter, object dbType) { if (dbType != null) { if (dbType is DbType) { parameter.DbType = (DbType)dbType; } else if (dbType is NpgsqlDbType) { parameter.NpgsqlDbType = (NpgsqlDbType)dbType; } else { NpgUtils.ThrowException(dbType); } } }
/// <summary> /// 是否日期+时间类型 /// </summary> /// <param name="dbType">DbType属性</param> public static bool IsDateTime(object dbType) { if (dbType == null) { return(false); } else if (dbType is DbType) { return(((DbType)dbType) == System.Data.DbType.DateTime); } else if (dbType is NpgsqlDbType) { return(((NpgsqlDbType)dbType) == NpgsqlDbType.Timestamp); } else { return(NpgUtils.ThrowException(dbType)); } }
/// <summary> /// 是否日期+时间+精度+时区类型 /// </summary> /// <param name="dbType">DbType属性</param> public static bool IsDateTimeOffset(object dbType) { #if netcore if (dbType == null) { return(false); } else if (dbType is DbType) { return(((DbType)dbType) == System.Data.DbType.DateTimeOffset); } else if (dbType is NpgsqlDbType) { return(((NpgsqlDbType)dbType) == NpgsqlDbType.TimestampTz); } else { return(NpgUtils.ThrowException(dbType)); } #endif #if !netcore if (dbType == null) { return(false); } else if (dbType is DbType) { return(((DbType)dbType) == System.Data.DbType.DateTimeOffset); } else if (dbType is NpgsqlDbType) { return(((NpgsqlDbType)dbType) == NpgsqlDbType.TimestampTZ); } else { return(NpgUtils.ThrowException(dbType)); } #endif }
/// <summary> /// 获取 Time 类型的 SQL 片断 /// </summary> /// <param name="value">值</param> /// <param name="dbType">数据类型</param> /// <param name="scale">小数位</param> /// <returns></returns> protected override string GetSqlValueOfTime(object value, object dbType, int?scale) { // 默认精度6 string format = @"hh\:mm\:ss\.ffffff"; if (NpgUtils.IsTime(dbType)) { string s = string.Empty; if (scale != null && scale.Value > 0) { s = string.Empty.PadLeft(scale.Value > 6 ? 6 : scale.Value, 'f'); } if (!string.IsNullOrEmpty(s)) { format = string.Format(@"hh\:mm\:ss\.{0}", s); } } string date = ((TimeSpan)value).ToString(format); string result = string.Format("'{0}'::TIME", date); return(result); }
/// <summary> /// 检查字段或属性成员声明的 DbType 是否为 Unicode 数据类型 /// </summary> /// <param name="m">将要检查的字段或属性成员</param> /// <param name="column">字段或属性成员显示声明的列特性</param> /// <returns></returns> public static bool IsUnicode(MemberVisitedStack.VisitedMember m, out ColumnAttribute column) { column = m != null?TypeUtils.GetColumnAttribute(m.Member, m.ReflectedType) : null; return(NpgUtils.IsUnicode(column == null ? null : column.DbType)); }
/// <summary> /// 检查字段或属性成员声明的 DbType 是否为 Unicode 数据类型 /// </summary> /// <param name="m">将要检查的字段或属性成员</param> /// <returns></returns> public static bool IsUnicode(MemberVisitedStack.VisitedMember m) { ColumnAttribute column = null; return(NpgUtils.IsUnicode(m, out column)); }
/// <summary> /// 访问 ToString 方法 /// </summary> /// <param name="node">即将访问的表达式</param> protected override Expression VisitToStringImpl(Expression node) { // => a.ID.ToString() // 字符串不进行转换 if (node == null || node.Type == typeof(string)) { return(_visitor.Visit(node)); } // 其它类型转字符串 bool isDate = node.Type == typeof(TimeSpan) || node.Type == typeof(TimeSpan?) || node.Type == typeof(DateTime) || node.Type == typeof(DateTime?) || node.Type == typeof(DateTimeOffset) || node.Type == typeof(DateTimeOffset?); if (isDate) { _builder.Append("TO_CHAR("); _visitor.Visit(node); string format = string.Empty; ColumnAttribute c = _visitedMark.Current != null?TypeUtils.GetColumnAttribute(_visitedMark.Current.Member, _visitedMark.Current.ReflectedType) : null; if (c != null && NpgUtils.IsTime(c.DbType)) { format = "hh24:mi:ss.us"; } else if (c != null && NpgUtils.IsDate(c.DbType)) { format = "yyyy-mm-dd"; } else if (c != null && (NpgUtils.IsDateTime(c.DbType) || NpgUtils.IsDateTime2(c.DbType))) { format = "yyyy-mm-dd hh24:mi:ss.us"; } else if (c != null && NpgUtils.IsDateTimeOffset(c.DbType)) { format = "yyyy-mm-dd hh24:mi:ss.us TZH:TZM"; } // 没有显式指定数据类型,则根据表达式的类型来判断 if (string.IsNullOrEmpty(format)) { if (node.Type == typeof(TimeSpan) || node.Type == typeof(TimeSpan?)) { format = "hh24:mi:ss.us"; } else if (node.Type == typeof(DateTime) || node.Type == typeof(DateTime?)) { format = "yyyy-mm-dd hh24:mi:ss.us"; } else if (node.Type == typeof(DateTimeOffset) || node.Type == typeof(DateTimeOffset?)) { format = "yyyy-mm-dd hh24:mi:ss.us TZH:TZM"; } } if (!string.IsNullOrEmpty(format)) { _builder.Append(",'"); _builder.Append(format); _builder.Append("'"); } _builder.Append(')'); } else if (node.Type == typeof(byte[])) { _builder.Append("ENCODE("); _visitor.Visit(node); _builder.Append(",'hex')"); } else { _builder.Append("CAST("); _visitor.Visit(node); _builder.Append(" AS VARCHAR)"); } return(node); }