79 lines
2.3 KiB
C#
79 lines
2.3 KiB
C#
using EntityFrameworkCore.Data;
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using Microsoft.EntityFrameworkCore;
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using var context = new DeadBallZoneLeagueDbContext();
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//PrintTeams();
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var teamOne = await context.Teams.FirstAsync(t => t.TeamId == 1);
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var teamTwo = await context.Teams.FirstAsync(t => t.TeamId == 2);
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var teamThree = await context.Teams.SingleAsync(t => t.TeamId == 3);
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var teamFour = await context.Teams.SingleOrDefaultAsync(t => t.TeamId == 3);
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// There is no entry for coaches yet, this function will provide a null to coach.
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// Rather than raise: "System.InvalidOperationException: Sequence contains no elements."
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var coach = await context.Coaches.FirstOrDefaultAsync();
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async Task CountFunctionsTeams(int id)
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{
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var numberOfTeams = await context.Teams.CountAsync(t => t.TeamId > id);
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Console.WriteLine($"Number of teams with ID > {id}: {numberOfTeams}");
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var maxTeams = await context.Teams.MaxAsync(t => t.TeamId);
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Console.WriteLine($"Max teams: {maxTeams}");
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var minTeams = await context.Teams.MinAsync(t => t.TeamId);
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Console.WriteLine($"Min teams: {minTeams}");
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var averageTeams = await context.Teams.AverageAsync(t => t.TeamId);
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Console.WriteLine($"Average teams: {averageTeams}");
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var sumTeams = await context.Teams.SumAsync(t => t.TeamId);
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Console.WriteLine($"Sum team IDs: {sumTeams}");
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}
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async Task GetAllTeamsQuerySyntax(string searchTerm)
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{
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var teams = await (
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from team in context.Teams
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where EF.Functions.Like(team.Name, $"%{searchTerm}%")
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select team)
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.ToListAsync();
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foreach (var team in teams)
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{
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Console.WriteLine(team.Name);
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}
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}
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async Task PrintTeams()
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{
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var teams = await context.Teams.ToListAsync();
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foreach (var team in teams)
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{
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Console.WriteLine(team.Name);
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}
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}
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async Task PrintFilteredTeams()
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{
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Console.WriteLine("Enter search term: ");
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var searchTerm = Console.ReadLine();
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// var filteredTeams = await context.Teams.Where(t => t.Name.Contains(searchTerm)).ToListAsync();
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var filteredTeams = await context.Teams.Where(t => EF.Functions.Like(t.Name, $"%{searchTerm}%")).ToListAsync();
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foreach (var team in filteredTeams)
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{
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Console.WriteLine(team.Name);
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}
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}
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async Task PrintTeamById(int id)
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{
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// Selection based on finding the Primary Key.
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var teamBasedOnId = await context.Teams.FindAsync(id);
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if (teamBasedOnId != null)
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{
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Console.WriteLine(teamBasedOnId.Name);
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}
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} |