84 lines
3.2 KiB
C#
84 lines
3.2 KiB
C#
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using System.Reflection;
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using System.Text;
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using Cassandra;
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using System.ComponentModel.DataAnnotations;
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using JiShe.CollectBus.Common.Attributes;
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using Cassandra.Mapping;
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namespace JiShe.CollectBus.Cassandra.Extensions
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{
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public static class SessionExtension
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{
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public static void CreateTable<TEntity>(this ISession session,string? defaultKeyspace=null) where TEntity : class
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{
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var type = typeof(TEntity);
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var tableAttribute = type.GetCustomAttribute<CassandraTableAttribute>();
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var tableName = tableAttribute?.Name ?? type.Name.ToLower();
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var tableKeyspace = tableAttribute?.Keyspace ?? defaultKeyspace;
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var properties = type.GetProperties();
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var primaryKey = properties.FirstOrDefault(p => p.GetCustomAttribute<KeyAttribute>() != null);
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if (primaryKey == null)
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{
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throw new InvalidOperationException($"No primary key defined for type {type.Name}");
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}
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var cql = new StringBuilder();
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cql.Append($"CREATE TABLE IF NOT EXISTS {tableKeyspace}.{tableName} (");
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foreach (var prop in properties)
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{
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var ignoreAttribute = prop.GetCustomAttribute<CassandraIgnoreAttribute>();
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if (ignoreAttribute != null) continue;
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var columnName = prop.Name.ToLower();
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var cqlType = GetCassandraType(prop.PropertyType);
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cql.Append($"{columnName} {cqlType}, ");
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}
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cql.Length -= 2; // Remove last comma and space
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cql.Append($", PRIMARY KEY ({primaryKey.Name.ToLower()}))");
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session.Execute(cql.ToString());
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}
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private static string GetCassandraType(Type type)
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{
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// 基础类型处理
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switch (Type.GetTypeCode(type))
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{
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case TypeCode.String: return "text";
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case TypeCode.Int32: return "int";
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case TypeCode.Int64: return "bigint";
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case TypeCode.Boolean: return "boolean";
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case TypeCode.DateTime: return "timestamp";
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case TypeCode.Byte: return "tinyint";
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}
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if (type == typeof(Guid)) return "uuid";
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if (type == typeof(DateTimeOffset)) return "timestamp";
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if (type == typeof(Byte[])) return "blob";
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// 处理集合类型
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if (type.IsGenericType)
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{
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var genericType = type.GetGenericTypeDefinition();
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var elementType = type.GetGenericArguments()[0];
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if (genericType == typeof(List<>))
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return $"list<{GetCassandraType(elementType)}>";
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if (genericType == typeof(HashSet<>))
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return $"set<{GetCassandraType(elementType)}>";
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if (genericType == typeof(Dictionary<,>))
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{
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var keyType = type.GetGenericArguments()[0];
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var valueType = type.GetGenericArguments()[1];
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return $"map<{GetCassandraType(keyType)}, {GetCassandraType(valueType)}>";
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}
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}
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throw new NotSupportedException($"不支持的类型: {type.Name}");
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}
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}
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}
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