/// <summary>
/// 获取基本类型的sql表达式节点
/// </summary>
/// <param name="memberExpression">成员表达式</param>
/// <returns>基本类型的sql表达式节点</returns>
protected ISqlBuilder GetColumnBuilder(MemberExpression memberExpression)
{
//若Mapper容器为空
if (_mapperContainer == null)
{
//则直接获取针对 WITH AS 临时表的sql表达式
return(new SqlBuilder("t.{0}", memberExpression.Member.Name));
}
//若不为空,则获取针对表的sql表达式
// 获取当前实体类型的Table元数据解析器
ITableMapper tableMapper = _mapperContainer.GetTableMapper(memberExpression.Expression.Type);
// 获取columnMapper
IColumnMapper columnMapper = tableMapper.GetColumnMapper(memberExpression.Member.Name);
// 获取sql列节点生成器
return(_commandTreeFactory.GetColumnBuilder(tableMapper.Header.TableAlias, columnMapper.ColumnName));
}
/// <summary>
/// 扩展方法: 获取Column元数据解析器
/// </summary>
/// <param name="mapperContainer">Mapper容器</param>
/// <param name="memberExpression">指定对象成员的表达式</param>
/// <returns>Column元数据解析器</returns>
public static IColumnMapper GetColumnMapper(this IMapperContainer mapperContainer, MemberExpression memberExpression)
{
//获取当前实体类型的Table元数据解析器
ITableMapper tableMapper = mapperContainer.GetTableMapper(memberExpression.Expression.Type);
//获取Column元数据解析器
return(tableMapper.GetColumnMapper(memberExpression.Member.Name));
}
/// <summary>
/// 创建对象访问关联
/// </summary>
/// <param name="property">关联对象属性</param>
/// <param name="mapperContainer">Mapper容器</param>
/// <param name="accessorLinkers">子属性的访问关联数组</param>
public AccessorLinker(PropertyInfo property, IMapperContainer mapperContainer, params AccessorLinker[] accessorLinkers)
{
//非空检查
Check.ArgumentNull(property, nameof(property));
Check.ArgumentNull(mapperContainer, nameof(mapperContainer));
//赋值
this.PropertyName = property.Name;
this.EntityAccessor = ObjectAccessor.GetAccessor(property.PropertyType);
this.TableMapper = mapperContainer.GetTableMapper(property.PropertyType);
this.AccessorLinkers = accessorLinkers;
}
/// <summary>
/// 创建实体数据操作对象
/// </summary>
/// <param name="factory">查询数据源创建工厂</param>
/// <param name="dbHelper">数据库操作对象</param>
/// <param name="commandTreeFactory">创建CommandTree的工厂</param>
/// <param name="mapperContainer">mapper容器</param>
public DbOperator(IDbFactory factory, DbHelper dbHelper, ICommandTreeFactory commandTreeFactory, IMapperContainer mapperContainer)
{
//非空检查
Check.ArgumentNull(factory, nameof(factory));
Check.ArgumentNull(dbHelper, nameof(dbHelper));
Check.ArgumentNull(commandTreeFactory, nameof(commandTreeFactory));
Check.ArgumentNull(mapperContainer, nameof(mapperContainer));
//赋值
this.Factory = factory;
this.DbHelper = dbHelper;
this.CommandTreeFactory = commandTreeFactory;
this.TableMapper = mapperContainer.GetTableMapper(typeof(TEntity));
//初始化sql
this._insertSql = this.GetInsertSql();
this._insertAllSql = this.GetInsertAllSql();
this._deleteSql = this.GetDeleteSql();
this._updateSql = this.GetUpdateSql();
this._updateAllSql = this.GetUpdateAllSql();
}