/// <summary>
/// 初始化一个<see cref="SqlBuilderBase"/>类型的实例
/// </summary>
/// <param name="matedata">实体元数据解析器</param>
/// <param name="tableDatabase">表数据库</param>
/// <param name="parameterManager">参数管理器</param>
protected SqlBuilderBase(IEntityMatedata matedata = null, ITableDatabase tableDatabase = null, IParameterManager parameterManager = null)
{
EntityMatedata = matedata;
TableDatabase = tableDatabase;
_parameterManager = parameterManager;
EntityResolver = new EntityResolver(matedata);
AliasRegister = new EntityAliasRegister();
Pager = new Pager();
UnionItems = new List <BuilderItem>();
CteItems = new List <BuilderItem>();
_excludedFilters = new List <Type>();
}
/// <summary>
/// 清空并初始化
/// </summary>
public ISqlBuilder Clear()
{
AliasRegister = new EntityAliasRegister();
ClearSelect();
ClearFrom();
ClearJoin();
ClearWhere();
ClearGroupBy();
ClearOrderBy();
ClearSqlParams();
ClearPageParams();
ClearUnionBuilders();
ClearCte();
return(this);
}