/// <summary>
/// 行数
/// </summary>
/// <param name="expression"></param>
/// <returns></returns>
public SqlExpressionCore <T> Count(Expression <Func <T, object> > expression = null)
{
sqlGenerate.Clear();
if (expression == null)
{
sqlGenerate.Sql.Append($"select count(*) from {sqlGenerate.TableName}");
}
else
{
SqlExpressionProvider.Count(expression, this.sqlGenerate);
}
return(this);
}
protected override SqlGenerate Count(UnaryExpression expression, SqlGenerate sqlGenerate)
{
SqlExpressionProvider.Count(expression.Operand, sqlGenerate);
return(sqlGenerate);
}
protected override SqlGenerate Count(LambdaExpression expression, SqlGenerate sqlGenerate)
{
SqlExpressionProvider.Count(expression.Body, sqlGenerate);
return(sqlGenerate);
}