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using DataKit.SQL.QueryExpressions;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System.Linq;
namespace DataKit.SQL.UnitTests
{
[TestClass]
public class SelectQueryGenerationTests
{
[TestMethod]
public void Can_Write_Multiple_Statements()
{
var queryExpression =
QueryExpression.Many(
QueryExpression.Select(
new[] { QueryExpression.Count() }
),
QueryExpression.Select(
new[] { QueryExpression.Count() }
));
var sql = TestHelpers.ConvertToSql(queryExpression);
Assert.AreEqual("SELECT COUNT(); SELECT COUNT();", sql);
}
[TestMethod]
public void Can_Write_Select_With_Projection_Only()
{
var queryExpression = QueryExpression.Select(
new[] { QueryExpression.Count() }
);
var sql = TestHelpers.ConvertToSql(queryExpression);
Assert.AreEqual("SELECT COUNT();", sql);
}
[TestMethod]
public void Can_Write_Select_With_Distinct_Count()
{
var queryExpression = QueryExpression.Select(
new[] { QueryExpression.Count(
QueryExpression.Distinct(QueryExpression.Column("Id"))
) }
);
var sql = TestHelpers.ConvertToSql(queryExpression);
Assert.AreEqual("SELECT COUNT(DISTINCT [Id]);", sql);
}
[TestMethod]
public void Can_Write_Select_With_Multiple_Projections()
{
var queryExpression = QueryExpression.Select(
new[] { QueryExpression.Column("Column1"), QueryExpression.Column("Column2") },
from: QueryExpression.Table("TestTable")
);
var sql = TestHelpers.ConvertToSql(queryExpression);
Assert.AreEqual("SELECT [Column1], [Column2] FROM [TestTable];", sql);
}
[TestMethod]
public void Can_Write_Select_With_Alias()
{
var queryExpression = QueryExpression.Select(
new[] { QueryExpression.As(QueryExpression.Column("TestColumn"), "aliasTest", out var _) },
from: QueryExpression.Table("TestTable")
);
var sql = TestHelpers.ConvertToSql(queryExpression);
Assert.AreEqual("SELECT [TestColumn] AS [aliasTest] FROM [TestTable];", sql);
}
[TestMethod]
public void Can_Write_Select_With_In_Query()
{
var queryExpression = QueryExpression.Select(
new[] { QueryExpression.IsIn(
QueryExpression.Column("Column"),
QueryExpression.Select(new[] { QueryExpression.Column("Id") }, from: QueryExpression.Table("OtherTable"))
) },
from: QueryExpression.Table("TestTable")
);
var sql = TestHelpers.ConvertToSql(queryExpression);
Assert.AreEqual("SELECT [Column] IN (SELECT [Id] FROM [OtherTable]) FROM [TestTable];", sql);
}
[TestMethod]
public void Can_Write_Select_With_Nested_Conditions()
{
var queryExpression = QueryExpression.Select(
new[] { QueryExpression.All() },
from: QueryExpression.Table("TestTable"),
where: QueryExpression.AndAlso(
QueryExpression.AreEqual(QueryExpression.Column("Left"), QueryExpression.Column("Right")),
QueryExpression.OrElse(
QueryExpression.AreEqual(QueryExpression.Column("Left"), QueryExpression.Column("Right")),
QueryExpression.AreNotEqual(QueryExpression.Column("Left"), QueryExpression.Column("Right"))
))
);
var sql = TestHelpers.ConvertToSql(queryExpression);
Assert.AreEqual("SELECT * FROM [TestTable] WHERE ([Left] = [Right] AND ([Left] = [Right] OR [Left] != [Right]));", sql);
}
[TestMethod]
public void Can_Write_Select_With_Parameter_Reference()
{
var queryExpression = QueryExpression.Select(
new[] { QueryExpression.All() },
from: QueryExpression.Table("TestTable"),
where: QueryExpression.AreEqual(QueryExpression.Column("Column"), QueryExpression.Parameter("myParameter"))
);
var sql = TestHelpers.ConvertToSql(queryExpression);
Assert.AreEqual("SELECT * FROM [TestTable] WHERE [Column] = @myParameter;", sql);
}
[TestMethod]
public void Can_Write_Select_With_Value()
{
var queryExpression = QueryExpression.Select(
new[] { QueryExpression.All() },
from: QueryExpression.Table("TestTable"),
where: QueryExpression.AreEqual(QueryExpression.Column("Column"), QueryExpression.Value("myValue"))
);
var sql = TestHelpers.ConvertToSql(queryExpression, out var parameters);
var firstParameter = parameters.First();
Assert.AreEqual("myValue", firstParameter.Value);
Assert.AreEqual($"SELECT * FROM [TestTable] WHERE [Column] = @{firstParameter.Key};", sql);
}
[TestMethod]
public void Can_Write_OrderBy_Query()
{
var queryExpression = QueryExpression.Select(
new[] { QueryExpression.All() },
from: QueryExpression.Table("TestTable"),
orderBy: new[]
{
QueryExpression.OrderBy(QueryExpression.Column("Column1")),
QueryExpression.OrderByDescending(QueryExpression.Column("Column2"))
});
var sql = TestHelpers.ConvertToSql(queryExpression);
Assert.AreEqual("SELECT * FROM [TestTable] ORDER BY [Column1], [Column2] DESC;", sql);
}
[TestMethod]
public void Can_Write_GroupBy_Query()
{
var queryExpression = QueryExpression.Select(
new[] { QueryExpression.All() },
from: QueryExpression.Table("TestTable"),
groupBy: new[]
{
QueryExpression.GroupBy(QueryExpression.Column("Column1")),
QueryExpression.GroupBy(QueryExpression.Column("Column2"))
});
var sql = TestHelpers.ConvertToSql(queryExpression);
Assert.AreEqual("SELECT * FROM [TestTable] GROUP BY [Column1], [Column2];", sql);
}
[TestMethod]
public void Can_Write_Limit_Query()
{
var queryExpression = QueryExpression.Select(
new[] { QueryExpression.All() },
from: QueryExpression.Table("TestTable"),
limit: QueryExpression.Limit(QueryExpression.Value(1))
);
var sql = TestHelpers.ConvertToSql(queryExpression, out var parameters);
var limitParameter = parameters.First();
Assert.AreEqual(1, limitParameter.Value);
Assert.AreEqual($"SELECT * FROM [TestTable] LIMIT @{limitParameter.Key};", sql);
}
[TestMethod]
public void Can_Write_Limit_And_Offset_Query()
{
var queryExpression = QueryExpression.Select(
new[] { QueryExpression.All() },
from: QueryExpression.Table("TestTable"),
limit: QueryExpression.Limit(QueryExpression.Value(1), QueryExpression.Value(2))
);
var sql = TestHelpers.ConvertToSql(queryExpression, out var parameters);
var limitParameter = parameters.First();
var offsetParameter = parameters.Skip(1).First();
Assert.AreEqual(1, limitParameter.Value);
Assert.AreEqual(2, offsetParameter.Value);
Assert.AreEqual($"SELECT * FROM [TestTable] LIMIT @{limitParameter.Key} OFFSET @{offsetParameter.Key};", sql);
}
[TestMethod]
public void Can_Write_Join_Query()
{
var leftTable = QueryExpression.Table("LeftTable");
var rightTable = QueryExpression.Table("RightTable");
var queryExpression = QueryExpression.Select(
new[] { QueryExpression.All() },
from: leftTable,
joins: new[]
{
QueryExpression.Join(rightTable, QueryExpression.Column("RightId", leftTable), QueryExpression.Column("Id", rightTable))
});
var sql = TestHelpers.ConvertToSql(queryExpression);
Assert.AreEqual("SELECT * FROM [LeftTable] INNER JOIN [RightTable] ON [LeftTable].[RightId] = [RightTable].[Id];", sql);
}
}
}