public string QuerySqlBuild(IQueryParameters parameters)
{
if (parameters == null)
{
throw new ArgumentNullException("参数集合不能为null");
}
string sql;
//分页查询
if (_queryBody.Take > 0)
{
var select = ResolveSelect();
var from = ResolveFrom(parameters);
var where = ResolveWhere(parameters);
var sort = ResolveOrder();
#region ==SqlServer分页需要指定排序==
//SqlServer分页需要指定排序，此处判断是否有主键，有主键默认按照主键排序
if (_sqlAdapter.SqlDialect == SqlDialect.SqlServer && sort.IsNull())
{
var first = _queryBody.JoinDescriptors.First();
if (first.EntityDescriptor.PrimaryKey.IsNo())
{
throw new Exception("SqlServer数据库没有主键的表需要指定排序字段才可以分页查询");
}
sort = _queryBody.JoinDescriptors.Count > 1 ? $"{_sqlAdapter.AppendQuote(first.Alias)}.{_sqlAdapter.AppendQuote(first.EntityDescriptor.PrimaryKey.Name)}" : first.EntityDescriptor.PrimaryKey.Name;
}
#endregion
sql = _sqlAdapter.GeneratePagingSql(select, from, where, sort, _queryBody.Skip, _queryBody.Take);
}
else
{
var sqlBuilder = new StringBuilder("SELECT ");
ResolveSelect(sqlBuilder);
sqlBuilder.Append(" FROM ");
ResolveFrom(sqlBuilder, parameters);
ResolveWhere(sqlBuilder, parameters);
ResolveOrder(sqlBuilder);
sql = sqlBuilder.ToString();
}
_logger?.LogDebug("Query:{0}", sql);
return(sql);
}
public string ToSql()
{
var selectSql = _expressionResolve.ToSelectSql(_selectExpression);
//取前几条表示分页查询
return(_take > 0 ? _sqlAdapter.GeneratePagingSql(_descriptor.TableName, WhereSql, _skip, _take, OrderBySql(), selectSql) : $"{_sqlStatement.Query} {WhereSql} {OrderBySql()}");
}
