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SqlDataProvider.cs
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SqlDataProvider.cs
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namespace MAS.GitlabComments.Data.Services.Implementations
{
using System;
using System.Collections.Generic;
using System.Dynamic;
using System.Linq;
using MAS.GitlabComments.Data.Filter;
using MAS.GitlabComments.Data.Models;
using MAS.GitlabComments.Data.Select;
/// <summary>
/// Provider of data for specified entity type
/// </summary>
/// <typeparam name="TEntity">Type of entity</typeparam>
public class SqlDataProvider<TEntity> : IDataProvider<TEntity>
where TEntity : BaseEntity
{
/// <inheritdoc cref="IDbConnectionFactory"/>
private IDbConnectionFactory DbConnectionFactory { get; }
/// <inheritdoc cref="IDbAdapter"/>
private IDbAdapter DbAdapter { get; }
/// <inheritdoc cref="IFilterBuilder"/>
private IFilterBuilder FilterBuilder { get; }
/// <inheritdoc cref="ComplexColumnQueryBuilder"/>
private IComplexColumnQueryBuilder ComplexColumnQueryBuilder { get; }
/// <summary>
/// Database table name for entity
/// </summary>
private string TableName { get; }
/// <summary>
/// List of entity fields
/// </summary>
private IEnumerable<string> EntityFields { get; }
/// <summary>
/// List of default entity fields which cannot be set manually
/// </summary>
private static IEnumerable<string> DefaultEntityFields { get; } = new[] { "CreatedOn", "ModifiedOn" };
/// <summary>
/// Initializing <see cref="SqlDataProvider{TEntity}"/>
/// </summary>
/// <param name="dbConnectionFactory">Factory providing database connection</param>
/// <param name="dbAdapter">Database operation adapter</param>
/// <param name="filterBuilder">Sql filter builder</param>
/// <param name="complexColumnBuilder">Complex column query builder</param>
/// <exception cref="ArgumentNullException">Parameter dbConnectionFactory is null</exception>
/// <exception cref="ArgumentNullException">Parameter dbAdapter is null</exception>
/// <exception cref="ArgumentNullException">Parameter filterBuilder is null</exception>
/// <exception cref="ArgumentNullException">Parameter complexColumnBuilder is null</exception>
public SqlDataProvider(IDbConnectionFactory dbConnectionFactory, IDbAdapter dbAdapter, IFilterBuilder filterBuilder, IComplexColumnQueryBuilder complexColumnBuilder)
{
DbConnectionFactory = dbConnectionFactory ?? throw new ArgumentNullException(nameof(DbConnectionFactory));
DbAdapter = dbAdapter ?? throw new ArgumentNullException(nameof(dbAdapter));
FilterBuilder = filterBuilder ?? throw new ArgumentNullException(nameof(filterBuilder));
ComplexColumnQueryBuilder = complexColumnBuilder ?? throw new ArgumentNullException(nameof(complexColumnBuilder));
TableName = typeof(TEntity).Name;
if (!TableName.EndsWith("s"))
{
TableName += "s";
}
EntityFields = GetEntityFields();
}
/// <summary>
/// Add entity
/// </summary>
/// <param name="entity">Entity</param>
/// <exception cref="ArgumentNullException">Parameter entity is null</exception>
/// <exception cref="Exception">No records was added</exception>
public void Add(TEntity entity)
{
if (entity == null)
{
throw new ArgumentNullException(nameof(entity));
}
var sqlQuery = $"INSERT INTO [{TableName}]";
var setStatements = new List<KeyValuePair<string, string>>();
var arguments = new ExpandoObject();
var fields = entity.GetType().GetProperties().Where(x => !DefaultEntityFields.Contains(x.Name));
foreach (var field in fields)
{
var boxedValue = field.GetValue(entity);
var isDefault = IsDefaultValue(boxedValue, field.PropertyType);
if (!isDefault)
{
var parameterName = $"@P{setStatements.Count + 1}";
if (arguments.TryAdd(parameterName, boxedValue))
{
setStatements.Add(new KeyValuePair<string, string>(field.Name, parameterName));
}
}
}
if (setStatements.Any())
{
string parameterName;
if (!setStatements.Any(x => x.Key == "Id"))
{
parameterName = $"@P{setStatements.Count + 1}";
if (arguments.TryAdd(parameterName, Guid.NewGuid()))
{
setStatements.Add(new KeyValuePair<string, string>("Id", parameterName));
}
else
{
throw new Exception("Cannot build arguments for sql command: [Id].");
}
}
parameterName = $"@P{setStatements.Count + 1}";
if (arguments.TryAdd(parameterName, DateTime.UtcNow))
{
setStatements.Add(new KeyValuePair<string, string>("CreatedOn", parameterName));
}
else
{
throw new Exception("Cannot build arguments for sql command: [CreatedOn].");
}
var fieldNames = setStatements.Select(x => $"[{x.Key}]");
var parameterNames = setStatements.Select(x => x.Value);
sqlQuery += $" ({string.Join(", ", fieldNames)}) VALUES ({string.Join(", ", parameterNames)})";
int affectedRows = 0;
using (var connection = DbConnectionFactory.CreateDbConnection())
{
affectedRows = DbAdapter.Execute(connection, sqlQuery, arguments);
}
if (affectedRows == 0)
{
throw new Exception("Insert command performed with empty result, no record was added.");
}
}
}
/// <summary>
/// Get all entities
/// </summary>
/// <returns>All entities</returns>
public IEnumerable<TEntity> Get()
{
IEnumerable<TEntity> entities = Enumerable.Empty<TEntity>();
var sqlQuery = $"SELECT * FROM [{TableName}]";
using (var connection = DbConnectionFactory.CreateDbConnection())
{
entities = DbAdapter.Query<TEntity>(connection, sqlQuery).ToList();
}
return entities;
}
/// <summary>
/// Get entity by it identifier
/// </summary>
/// <param name="entityId">Identifier value</param>
/// <returns>Entity by identifier if it found; otherwise null</returns>
public TEntity Get(Guid entityId)
{
// TODO: add param check
TEntity entity = null;
var sqlQuery = $"SELECT * FROM [{TableName}] WHERE Id = @P1";
using (var connection = DbConnectionFactory.CreateDbConnection())
{
entity = DbAdapter.Query<TEntity>(connection, sqlQuery, new { P1 = entityId }).FirstOrDefault();
}
return entity;
}
/// <summary>
/// Update specified by identifier entity with new column values
/// </summary>
/// <param name="entityId">Identifier value</param>
/// <param name="newValues">Entity new column values</param>
/// <exception cref="ArgumentNullException">Parameter entityId is default</exception>
/// <exception cref="ArgumentNullException">Parameter newValues is null or empty</exception>
/// <exception cref="Exception">Update command doesn't applied to any record</exception>
public void Update(Guid entityId, IDictionary<string, object> newValues)
{
if (entityId == default)
{
throw new ArgumentNullException(nameof(entityId));
}
if (newValues == null || !newValues.Any())
{
throw new ArgumentNullException(nameof(newValues));
}
var setStatements = new List<string>();
var arguments = new ExpandoObject();
var argumentsCount = 0;
foreach (var pair in newValues.Where(x => !string.IsNullOrEmpty(x.Key) && x.Value != null))
{
var isDefaultValue = IsDefaultValue(pair.Value, pair.Value.GetType());
if (!isDefaultValue
&& EntityFields.Contains(pair.Key)
&& !DefaultEntityFields.Contains(pair.Key))
{
var parameterName = $"@P{argumentsCount + 1}";
if (arguments.TryAdd(parameterName, pair.Value))
{
setStatements.Add($"[{pair.Key}] = {parameterName}");
argumentsCount++;
}
}
}
if (setStatements.Any())
{
var parameterName = $"@P{argumentsCount + 1}";
if (arguments.TryAdd(parameterName, DateTime.UtcNow))
{
setStatements.Add($"[ModifiedOn] = {parameterName}");
argumentsCount++;
}
var setStatement = string.Join(", ", setStatements);
if (arguments.TryAdd($"@P{++argumentsCount}", entityId))
{
var sqlQuery = $"UPDATE [{TableName}] SET {setStatement} WHERE [Id] = @P{argumentsCount}";
int affectedRows = 0;
using (var connection = DbConnectionFactory.CreateDbConnection())
{
affectedRows = DbAdapter.Execute(connection, sqlQuery, arguments);
}
if (affectedRows == 0)
{
throw new Exception("Update command performed with empty result, no record was updated.");
}
}
}
}
/// <summary>
/// Delete entities by their identifiers
/// </summary>
/// <param name="entityIds">Array of identifier values</param>
/// <exception cref="ArgumentNullException">Parameter entityIds is null</exception>
public void Delete(params Guid[] entityIds)
{
if (entityIds == null)
{
throw new ArgumentNullException(nameof(entityIds));
}
entityIds = entityIds.Where(x => x != default).ToArray();
if (entityIds.Any())
{
var sqlQuery = $"DELETE FROM [{TableName}] WHERE [Id] IN @P1";
using (var connection = DbConnectionFactory.CreateDbConnection())
{
DbAdapter.Execute(connection, sqlQuery, new { P1 = entityIds });
}
}
}
/// <summary>
/// Get entities with filter
/// </summary>
/// <param name="filter">Filter config</param>
/// <exception cref="ArgumentException">Filter contains column not presented in Entity</exception>
/// <returns>Filtered entities</returns>
public IEnumerable<TEntity> Where(FilterGroup filter)
{
if (filter == null || filter.IsEmpty)
{
return Get();
}
var entityFields = GetEntityFields();
var filterColumns = filter.GetFilterColumns();
var notValidColumns = filterColumns.Except(entityFields);
if (notValidColumns.Any())
{
throw new ArgumentException($"Filter contains columns not presented in entity: {string.Join(", ", notValidColumns)}");
}
var (filterSql, filterArgs) = FilterBuilder.Build(filter);
if (string.IsNullOrEmpty(filterSql))
{
return Get();
}
IEnumerable<TEntity> entities = Enumerable.Empty<TEntity>();
var sqlQuery = $"SELECT * FROM [{TableName}] WHERE {filterSql}";
using (var connection = DbConnectionFactory.CreateDbConnection())
{
entities = DbAdapter.Query<TEntity>(connection, sqlQuery, filterArgs).ToList();
}
return entities;
}
/// <summary>
/// Select entities into custom model
/// </summary>
/// <typeparam name="TProjection">Projection model type</typeparam>
/// <param name="configuration">Select configuration</param>
/// <exception cref="ArgumentNullException">Parameter configuration is null</exception>
/// <returns>Entities mapped to specified model</returns>
public IEnumerable<TProjection> Select<TProjection>(SelectConfiguration configuration)
{
if (configuration == null)
{
throw new ArgumentNullException(nameof(configuration));
}
var filterSql = string.Empty;
IReadOnlyDictionary<string, object> filterArgs = new Dictionary<string, object>();
if (configuration.Filter != null && !configuration.Filter.IsEmpty)
{
var entityFields = GetEntityFields();
var filterColumns = configuration.Filter.GetFilterColumns();
var notValidColumns = filterColumns.Except(entityFields);
if (notValidColumns.Any())
{
throw new ArgumentException($"Filter contains columns not presented in entity: {string.Join(", ", notValidColumns)}");
}
var builtFilter = FilterBuilder.Build(configuration.Filter);
filterSql = $"WHERE {builtFilter.sqlCondition}";
filterArgs = builtFilter.sqlArguments;
}
var complexColumnData = ComplexColumnQueryBuilder.BuildComplexColumns<TProjection>(TableName);
var columns = "*";
var joinPart = "";
if (complexColumnData != null)
{
columns = string.Join($"{Environment.NewLine}, ", complexColumnData.Columns.Select(column => column.ToString()));
joinPart = string.Join(Environment.NewLine, complexColumnData.Joins.Select(joinData => joinData.ToQueryPart()));
}
IEnumerable<TProjection> entities = Enumerable.Empty<TProjection>();
var sqlQuery = $"SELECT {columns} FROM [{TableName}] {joinPart} {filterSql}";
using (var connection = DbConnectionFactory.CreateDbConnection())
{
entities = DbAdapter.Query<TProjection>(connection, sqlQuery, filterArgs).ToList();
}
return entities;
}
#region Not public API
/// <summary>
/// Get entity field names
/// </summary>
/// <returns>List of entity field names</returns>
private static IEnumerable<string> GetEntityFields()
{
return typeof(TEntity).GetProperties().Select(x => x.Name);
}
/// <summary>
/// Check if boxed value is default value
/// </summary>
/// <param name="boxedValue">Boxed value</param>
/// <param name="type">Type of value in the box</param>
/// <returns>True if boxed value is default; otherwise false</returns>
private static bool IsDefaultValue(object boxedValue, Type type)
{
if (!type.IsValueType)
{
return boxedValue == default;
}
var def = Activator.CreateInstance(type);
return boxedValue.Equals(def);
}
#endregion
}
}