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using System;
using System.Collections.Generic;
using System.Text;
namespace Apewer.Source
{
/// <summary>ORM 帮助程序。</summary>
public static class OrmHelper
{
private static List<T> Convert<T>(List<IRecord> input) where T : IRecord
{
if (input == null) return null;
var output = new List<T>(input.Count);
foreach (var record in input)
{
if (record == null) continue;
var t = (T)record;
output.Add(t);
}
return output;
}
private static Result<T> Convert<T>(Result<IRecord> input) where T : IRecord
{
if (input == null) return null;
var result = new Result<T>();
result.Code = input.Code;
result.Exception = input.Exception;
result.Message = input.Message;
if (input.HasEntity) result.Entity = (T)input.Entity;
return result;
}
private static Result<List<T>> Convert<T>(Result<List<IRecord>> input) where T : IRecord
{
if (input == null) return null;
var result = new Result<List<T>>();
result.Code = input.Code;
result.Exception = input.Exception;
result.Message = input.Message;
result.Entity = Convert<T>(input.Entity);
return result;
}
/// <summary>查询记录。</summary>
/// <param name="database">数据库对象。</param>
/// <param name="model">记录模型。</param>
/// <param name="sql">SQL 语句。</param>
public static Result<List<IRecord>> Query(IDatabase database, Type model, string sql)
{
if (database == null) return Result<List<IRecord>>.Error("数据库无效。");
if (model == null) return Result<List<IRecord>>.Error("模型类型无效。");
if (string.IsNullOrEmpty(sql)) return Result<List<IRecord>>.Error("SQL 语句无效。");
using (var query = database.Query(sql) as Query)
{
if (query == null) return Result<List<IRecord>>.Error("查询实例无效。");
if (query.Exception != null) return Result<List<IRecord>>.Error(query.Exception);
try
{
var list = query.Fill(model);
return new Result<List<IRecord>>(list);
}
catch (Exception ex)
{
return Result<List<IRecord>>.Error(ex);
}
}
}
/// <summary>查询记录。</summary>
/// <typeparam name="T">记录模型。</typeparam>
/// <param name="database">数据库对象。</param>
/// <param name="sql">SQL 语句。</param>
public static Result<List<T>> Query<T>(IDatabase database, string sql) where T : IRecord
{
return Convert<T>(Query(database, typeof(T), sql));
}
/// <summary>查询记录。</summary>
/// <param name="database">数据库对象。</param>
/// <param name="model">记录模型。</param>
/// <param name="sqlGetter">生成 SQL 语句的函数,传入参数为表名。</param>
public static Result<List<IRecord>> Query(IDatabase database, Type model, Func<string, string> sqlGetter)
{
if (sqlGetter == null) return Result<List<IRecord>>.Error("SQL 语句获取函数无效。");
try
{
var tableName = TableStructure.ParseModel(model).Table;
if (string.IsNullOrEmpty(tableName)) return Result<List<IRecord>>.Error("表名无效。");
return Query(database, model, sqlGetter(tableName));
}
catch (Exception ex)
{
return Result<List<IRecord>>.Error(ex);
}
}
/// <summary>查询记录。</summary>
/// <typeparam name="T">记录模型。</typeparam>
/// <param name="database">数据库对象。</param>
/// <param name="sqlGetter">生成 SQL 语句的函数,传入参数为表名。</param>
public static Result<List<T>> Query<T>(IDatabase database, Func<string, string> sqlGetter) where T : IRecord
{
return Convert<T>(Query(database, typeof(T), sqlGetter));
}
/// <summary>获取具有指定主键的记录。</summary>
/// <param name="database">数据库对象。</param>
/// <param name="model">记录模型。</param>
/// <param name="key">主键。</param>
/// <param name="sqlGetter">生成 SQL 语句的函数,传入参数为表名和主键值。</param>
public static Result<IRecord> Get(IDatabase database, Type model, string key, Func<string, string, string> sqlGetter)
{
if (sqlGetter == null) return Result<IRecord>.Error("SQL 语句获取函数无效。");
var safetyKey = TextUtility.SafeKey(key);
if (string.IsNullOrEmpty(safetyKey)) return Result<IRecord>.Error("主键无效。");
string tableName;
try
{
tableName = TableStructure.ParseModel(model).Table;
if (string.IsNullOrEmpty(tableName)) return Result<IRecord>.Error("表名无效。");
}
catch (Exception ex)
{
return new Result<IRecord>(ex);
}
var sql = sqlGetter(tableName, safetyKey);
var list = Query(database, model, sql);
var result = new Result<IRecord>();
result.Code = list.Code;
result.Exception = list.Exception;
result.Message = list.Message;
result.Entity = list.Entity.SafeFirst();
return result;
}
/// <summary>获取具有指定主键的记录。</summary>
/// <typeparam name="T">记录模型。</typeparam>
/// <param name="database">数据库对象。</param>
/// <param name="key">主键。</param>
/// <param name="sqlGetter">生成 SQL 语句的函数,传入参数为表名和主键值。</param>
public static Result<T> Get<T>(IDatabase database, string key, Func<string, string, string> sqlGetter) where T : IRecord
{
return Convert<T>(Get(database, typeof(T), key, sqlGetter));
}
/// <summary>获取主键。</summary>
/// <param name="database">数据库对象。</param>
/// <param name="model">记录模型。</param>
/// <param name="sqlGetter">生成 SQL 语句的函数,传入参数为表名。</param>
public static Result<List<string>> Keys(IDatabase database, Type model, Func<string, string> sqlGetter)
{
if (database == null) return Result<List<string>>.Error("数据库无效。");
if (model == null) return Result<List<string>>.Error("模型类型无效。");
if (sqlGetter == null) return Result<List<string>>.Error("SQL 语句获取函数无效。");
var tableStructure = null as TableStructure;
try
{
tableStructure = TableStructure.ParseModel(model);
}
catch (Exception ex)
{
return Result<List<string>>.Error(ex);
}
var tableName = tableStructure.Table;
if (string.IsNullOrEmpty(tableName)) return Result<List<string>>.Error("表名无效。");
// var keyName = null as string;
// foreach (var column in tableStructure.Columns)
// {
// if (column.Key == "Key")
// {
// keyName = column.Value.Field;
// break;
// }
// }
// if (string.IsNullOrEmpty(keyName)) return Result<List<string>>.Error("主键字段无效。");
// var sql = sqlGetter(tableName, keyName);
var sql = sqlGetter(tableName);
var query = null as IQuery;
try
{
query = database.Query(sql);
if (query == null) return Result<List<string>>.Error("查询实例无效。");
var list = new List<string>(query.Rows);
for (var r = 0; r < query.Rows; r++)
{
var key = TextUtility.SafeKey(query.Text(r));
if (string.IsNullOrEmpty(key)) continue;
list.Add(key);
}
query.Dispose();
list.Capacity = list.Count;
return new Result<List<string>>(list);
}
catch (Exception ex)
{
RuntimeUtility.Dispose(query);
return Result<List<string>>.Error(ex);
}
}
/// <summary>获取主键。</summary>
/// <typeparam name="T">记录模型。</typeparam>
/// <param name="database">数据库对象。</param>
/// <param name="sqlGetter">生成 SQL 语句的函数,传入参数为表名。</param>
public static Result<List<string>> Keys<T>(IDatabase database, Func<string, string> sqlGetter) where T : IRecord
{
return Keys(database, typeof(T), sqlGetter);
}
}
}