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using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Dynamic.Core;
using System.Linq.Expressions;
using Util.Datas.Queries;
using Util.Datas.Queries.Criterias;
using Util.Datas.Queries.Internal;
using Util.Domains.Repositories;
namespace Util {
/// <summary>
/// 查询扩展
/// </summary>
public static partial class Extensions {
/// <summary>
/// 添加查询条件
/// </summary>
/// <typeparam name="TEntity">实体类型</typeparam>
/// <param name="source">数据源</param>
/// <param name="criteria">查询条件对象</param>
public static IQueryable<TEntity> Where<TEntity>( this IQueryable<TEntity> source, ICriteria<TEntity> criteria ) where TEntity : class {
if( source == null )
throw new ArgumentNullException( nameof( source ) );
if( criteria == null )
throw new ArgumentNullException( nameof( criteria ) );
var predicate = criteria.GetPredicate();
if( predicate == null )
return source;
return source.Where( predicate );
}
/// <summary>
/// 添加查询条件
/// </summary>
/// <typeparam name="TEntity">实体类型</typeparam>
/// <param name="source">数据源</param>
/// <param name="predicate">查询条件</param>
/// <param name="condition">该值为true时添加查询条件，否则忽略</param>
public static IQueryable<TEntity> WhereIf<TEntity>( this IQueryable<TEntity> source, Expression<Func<TEntity, bool>> predicate, bool condition ) where TEntity : class {
if( source == null )
throw new ArgumentNullException( nameof( source ) );
if( condition == false )
return source;
return source.Where( predicate );
}
/// <summary>
/// 添加查询条件
/// </summary>
/// <typeparam name="TEntity">实体类型</typeparam>
/// <param name="source">数据源</param>
/// <param name="predicate">查询条件,如果参数值为空，则忽略该查询条件，范例：t => t.Name == ""，该查询条件被忽略。
/// 注意：一次仅能添加一个条件，范例：t => t.Name == "a" && t.Mobile == "123"，不支持，将抛出异常</param>
public static IQueryable<TEntity> WhereIfNotEmpty<TEntity>( this IQueryable<TEntity> source, Expression<Func<TEntity, bool>> predicate ) where TEntity : class {
if( source == null )
throw new ArgumentNullException( nameof( source ) );
predicate = Helper.GetWhereIfNotEmptyExpression( predicate );
if( predicate == null )
return source;
return source.Where( predicate );
}
/// <summary>
/// 添加范围查询条件
/// </summary>
/// <typeparam name="TEntity">实体类型</typeparam>
/// <param name="source">数据源</param>
/// <typeparam name="TProperty">属性类型</typeparam>
/// <param name="propertyExpression">属性表达式，范例：t => t.Age</param>
/// <param name="min">最小值</param>
/// <param name="max">最大值</param>
/// <param name="boundary">包含边界</param>
public static IQueryable<TEntity> Between<TEntity, TProperty>( this IQueryable<TEntity> source, Expression<Func<TEntity, TProperty>> propertyExpression, int? min, int? max, Boundary boundary = Boundary.Both ) where TEntity : class {
if( source == null )
throw new ArgumentNullException( nameof( source ) );
return source.Where( new IntSegmentCriteria<TEntity, TProperty>( propertyExpression, min, max, boundary ) );
}
/// <summary>
/// 添加范围查询条件
/// </summary>
/// <typeparam name="TEntity">实体类型</typeparam>
/// <param name="source">数据源</param>
/// <typeparam name="TProperty">属性类型</typeparam>
/// <param name="propertyExpression">属性表达式，范例：t => t.Age</param>
/// <param name="min">最小值</param>
/// <param name="max">最大值</param>
/// <param name="boundary">包含边界</param>
public static IQueryable<TEntity> Between<TEntity, TProperty>( this IQueryable<TEntity> source, Expression<Func<TEntity, TProperty>> propertyExpression, double? min, double? max, Boundary boundary = Boundary.Both ) where TEntity : class {
if( source == null )
throw new ArgumentNullException( nameof( source ) );
return source.Where( new DoubleSegmentCriteria<TEntity, TProperty>( propertyExpression, min, max, boundary ) );
}
/// <summary>
/// 添加范围查询条件
/// </summary>
/// <typeparam name="TEntity">实体类型</typeparam>
/// <param name="source">数据源</param>
/// <typeparam name="TProperty">属性类型</typeparam>
/// <param name="propertyExpression">属性表达式，范例：t => t.Age</param>
/// <param name="min">最小值</param>
/// <param name="max">最大值</param>
/// <param name="boundary">包含边界</param>
public static IQueryable<TEntity> Between<TEntity, TProperty>( this IQueryable<TEntity> source, Expression<Func<TEntity, TProperty>> propertyExpression, decimal? min, decimal? max, Boundary boundary = Boundary.Both ) where TEntity : class {
if( source == null )
throw new ArgumentNullException( nameof( source ) );
return source.Where( new DecimalSegmentCriteria<TEntity, TProperty>( propertyExpression, min, max, boundary ) );
}
/// <summary>
/// 添加范围查询条件
/// </summary>
/// <typeparam name="TEntity">实体类型</typeparam>
/// <param name="source">数据源</param>
/// <typeparam name="TProperty">属性类型</typeparam>
/// <param name="propertyExpression">属性表达式，范例：t => t.Time</param>
/// <param name="min">最小值</param>
/// <param name="max">最大值</param>
/// <param name="includeTime">是否包含时间</param>
/// <param name="boundary">包含边界</param>
public static IQueryable<TEntity> Between<TEntity, TProperty>( this IQueryable<TEntity> source, Expression<Func<TEntity, TProperty>> propertyExpression, DateTime? min, DateTime? max, bool includeTime = true, Boundary? boundary = null ) where TEntity : class {
if( source == null )
throw new ArgumentNullException( nameof( source ) );
if( includeTime )
return source.Where( new DateTimeSegmentCriteria<TEntity, TProperty>( propertyExpression, min, max, boundary ?? Boundary.Both ) );
return source.Where( new DateSegmentCriteria<TEntity, TProperty>( propertyExpression, min, max, boundary ?? Boundary.Left ) );
}
/// <summary>
/// 分页，包含排序
/// </summary>
/// <typeparam name="TEntity">实体类型</typeparam>
/// <param name="source">数据源</param>
/// <param name="pager">分页对象</param>
public static IQueryable<TEntity> Page<TEntity>( this IQueryable<TEntity> source, IPager pager ) {
if( source == null )
throw new ArgumentNullException( nameof( source ) );
if( pager == null )
throw new ArgumentNullException( nameof( pager ) );
if( string.IsNullOrWhiteSpace( pager.Order ) )
pager.Order = "Id";
if( pager.TotalCount <= 0 )
pager.TotalCount = source.Count();
return source.OrderBy( pager.Order ).Skip( pager.GetSkipCount() ).Take( pager.PageSize );
}
/// <summary>
/// 转换为分页列表，包含排序分页操作
/// </summary>
/// <typeparam name="TEntity">实体类型</typeparam>
/// <param name="source">数据源</param>
/// <param name="pager">分页对象</param>
public static PagerList<TEntity> ToPagerList<TEntity>( this IQueryable<TEntity> source, IPager pager ) {
if( source == null )
throw new ArgumentNullException( nameof( source ) );
if( pager == null )
throw new ArgumentNullException( nameof( pager ) );
return new PagerList<TEntity>( pager, source.Page( pager ).ToList() );
}
}
}