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using System.Diagnostics;
using Dapper;
namespace CrupestApi.Commons.Crud;
public interface IWhereClause
{
string GenerateSql(DynamicParameters parameters);
IEnumerable<IWhereClause>? GetSubclauses()
{
return null;
}
IEnumerable<string>? GetRelatedColumns()
{
var subclauses = GetSubclauses();
if (subclauses is null) return null;
var result = new List<string>();
foreach (var subclause in subclauses)
{
var columns = subclause.GetRelatedColumns();
if (columns is not null)
result.AddRange(columns);
}
return result;
}
public static string RandomKey(int length)
{
// I think it's safe to use random here because it's just to differentiate the parameters.
// TODO: Consider data race!
var random = new Random();
var chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
var result = new string(Enumerable.Repeat(chars, length)
.Select(s => s[random.Next(s.Length)]).ToArray());
return result;
}
public static string GenerateRandomParameterName(DynamicParameters parameters)
{
var parameterName = IWhereClause.RandomKey(10);
int retryTimes = 1;
while (parameters.ParameterNames.Contains(parameterName))
{
retryTimes++;
Debug.Assert(retryTimes <= 100);
parameterName = IWhereClause.RandomKey(10);
}
return parameterName;
}
}
public static class DynamicParametersExtensions
{
public static string AddRandomNameParameter(this DynamicParameters parameters, object value)
{
var parameterName = IWhereClause.GenerateRandomParameterName(parameters);
parameters.Add(parameterName, value);
return parameterName;
}
}
public class AndWhereClause : IWhereClause
{
public List<IWhereClause> Clauses { get; } = new List<IWhereClause>();
public IEnumerable<IWhereClause> GetSubclauses()
{
return Clauses;
}
public AndWhereClause(IEnumerable<IWhereClause> clauses)
{
Clauses.AddRange(clauses);
}
public AndWhereClause(params IWhereClause[] clauses)
{
Clauses.AddRange(clauses);
}
public static AndWhereClause Create(params IWhereClause[] clauses)
{
return new AndWhereClause(clauses);
}
public string GenerateSql(DynamicParameters parameters)
{
return string.Join(" AND ", Clauses.Select(c => $"({c.GenerateSql(parameters)})"));
}
}
public class OrWhereClause : IWhereClause
{
public List<IWhereClause> Clauses { get; } = new List<IWhereClause>();
public IEnumerable<IWhereClause> GetSubclauses()
{
return Clauses;
}
public OrWhereClause(IEnumerable<IWhereClause> clauses)
{
Clauses.AddRange(clauses);
}
public OrWhereClause(params IWhereClause[] clauses)
{
Clauses.AddRange(clauses);
}
public static OrWhereClause Create(params IWhereClause[] clauses)
{
return new OrWhereClause(clauses);
}
public string GenerateSql(DynamicParameters parameters)
{
return string.Join(" OR ", Clauses.Select(c => $"({c.GenerateSql(parameters)})"));
}
}
public class CompareWhereClause : IWhereClause
{
public string Column { get; }
public string Operator { get; }
public object Value { get; }
public List<string> GetRelatedColumns()
{
return new List<string> { Column };
}
// It's user's responsibility to keep column safe, with proper escape.
public CompareWhereClause(string column, string @operator, object value)
{
Column = column;
Operator = @operator;
Value = value;
}
public static CompareWhereClause Create(string column, string @operator, object value)
{
return new CompareWhereClause(column, @operator, value);
}
public static CompareWhereClause Eq(string column, object value)
{
return new CompareWhereClause(column, "=", value);
}
public static CompareWhereClause Neq(string column, object value)
{
return new CompareWhereClause(column, "<>", value);
}
public static CompareWhereClause Gt(string column, object value)
{
return new CompareWhereClause(column, ">", value);
}
public static CompareWhereClause Gte(string column, object value)
{
return new CompareWhereClause(column, ">=", value);
}
public static CompareWhereClause Lt(string column, object value)
{
return new CompareWhereClause(column, "<", value);
}
public static CompareWhereClause Lte(string column, object value)
{
return new CompareWhereClause(column, "<=", value);
}
public string GenerateSql(DynamicParameters parameters)
{
var parameterName = parameters.AddRandomNameParameter(Value);
return $"{Column} {Operator} @{parameterName}";
}
}
public class WhereClause : IWhereClause
{
public DynamicParameters Parameters { get; } = new DynamicParameters();
public List<IWhereClause> Clauses { get; } = new List<IWhereClause>();
public WhereClause(IEnumerable<IWhereClause> clauses)
{
Clauses.AddRange(clauses);
}
public WhereClause(params IWhereClause[] clauses)
{
Clauses.AddRange(clauses);
}
public IEnumerable<IWhereClause> GetSubclauses()
{
return Clauses;
}
public WhereClause Add(params IWhereClause[] clauses)
{
Clauses.AddRange(clauses);
return this;
}
public static WhereClause Create(params IWhereClause[] clauses)
{
return new WhereClause(clauses);
}
public WhereClause Eq(string column, object value)
{
return Add(CompareWhereClause.Eq(column, value));
}
public WhereClause Neq(string column, object value)
{
return Add(CompareWhereClause.Neq(column, value));
}
public WhereClause Eq(IEnumerable<KeyValuePair<string, object>> columnValueMap)
{
var clauses = columnValueMap.Select(kv => (IWhereClause)CompareWhereClause.Eq(kv.Key, kv.Value)).ToArray();
return Add(clauses);
}
public string GenerateSql(DynamicParameters dynamicParameters)
{
return string.Join(" AND ", Clauses.Select(c => $"({c.GenerateSql(Parameters)})"));
}
public string GenerateSql()
{
return GenerateSql(Parameters);
}
}
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