SqlModeller

Sql Query Builder

NuGet

PM> Install-Package SqlModeller

Example

var countryTable = new Table("c", "Country");
var teamTable = new Table("t", "Team");
var playerTable = new Table("p", "Player");

var cteQuery = new SelectQuery()

// SELECT
    .SelectRowNumber("_ROW")
        .SelectCount("_COUNT")
        .SelectGroupKey("_GROUP_KEY")
        .Select("1 as ONE")
        .SelectAll()
        .Select(countryTable, "ID", "C_ID", Aggregate.Min) // should not aggregate, its the group by
        .Select(teamTable, "ID", "T_ID", Aggregate.Min)
        .Select(teamTable, "Name", "T_NAME", Aggregate.Avg)
        .Select(playerTable, "Name", "P_NAME", Aggregate.Sum)
// FROM
    .From(countryTable)
        .LeftJoin(teamTable, "CountryID", countryTable, "ID")
        .Join(playerTable, "TeamID", teamTable, "ID", JoinType.InnerJoin, "AND 1 = 1")
// WHERE
    .Where(Combine.And)
        .Where("p.Name IS NOT NULL")
        .WhereColumnLike(teamTable, "Name", "F.C.", LikeMode.WildcardLeft)
        .WhereColumnLike(teamTable, "Description", "\"premier league\" -winners", LikeMode.FreeText)
        .WhereColumnColumn(teamTable, "ID", Compare.NotEqual, countryTable, "ID")
        .WhereColumnValue(playerTable, "FirstName", Compare.NotEqual, "Peter")
        .WhereColumnValue(playerTable, "StartDate", Compare.NotEqual, DateTime.Now)
        .WhereCollection(Combine.Or, new WhereFilterCollection()
            .WhereColumnColumn(teamTable, "Value1", Compare.GreaterThan, countryTable, "Value2")
            .WhereColumnValue(teamTable, "Value3", Compare.LessThan, 1)
        )
// GROUP BY
    .GroupBy(countryTable, "ID")
// Having
    .Having(Combine.And)
        .Having("SUM(t.Points) > 4")
        .HavingColumnValue(Aggregate.Sum, playerTable, "Goals", Compare.GreaterThan, 10)
        .HavingCollection(Combine.Or,new HavingFilterCollection()
            .HavingColumnValue(Aggregate.Min, playerTable, "RedCards", Compare.GreaterThan, 1)
            .HavingColumnValue(Aggregate.Max, playerTable, "RedCards", Compare.LessThan, 5)
        )
// ORDER BY
    .OrderBy(countryTable, "ID", OrderDir.Asc)
           .OrderByDesc(playerTable, "ID");

var cte = new CommonTableExpression()
          {
              Alias = "cte1",
              Query = cteQuery
          };


var query = new Query();
query.CommonTableExpressions.Add(cte);
query.SelectQuery = new SelectQuery()
    .SelectRowNumber("_ROW")
    .SelectTotal("_TOTAL_ROWS", 0)
    .SelectAll()
    .From(cte.Alias, cte.Alias)
    .OrderBy(cte.Alias, "_ROW")
    .Offset(10)
    .Fetch(5);

var compiled = query.Compile();

Console.WriteLine(compiled.ParameterSql);
Console.WriteLine(compiled.Sql);