/// <summary>
/// 初始化类<see cref="DbContextBase{TModel}"/>。
/// </summary>
/// <param name="executor">数据库执行接口。</param>
/// <param name="logger">日志接口。</param>
/// <param name="sqlHelper">SQL辅助接口。</param>
/// <param name="sqlGenerator">脚本生成器。</param>
/// <param name="visitorFactory">条件表达式解析器工厂实例。</param>
public DbContext(IDatabase executor, ILogger <IDatabase> logger, ISqlHelper sqlHelper,
IQuerySqlGenerator sqlGenerator, IExpressionVisitorFactory visitorFactory)
: base(executor, logger, sqlHelper, sqlGenerator, visitorFactory)
{
_executor = executor;
_logger = logger;
}
/// <summary>
/// 初始化类<see cref="DbContextBase{TModel}"/>。
/// </summary>
/// <param name="executor">数据库执行接口。</param>
/// <param name="logger">日志接口。</param>
/// <param name="sqlHelper">SQL辅助接口。</param>
/// <param name="sqlGenerator">脚本生成器。</param>
/// <param name="visitorFactory">条件表达式解析器工厂实例。</param>
public DbTransactionContext(IDbExecutor executor, ILogger logger, ISqlHelper sqlHelper,
IQuerySqlGenerator sqlGenerator, IExpressionVisitorFactory visitorFactory)
: base(executor, logger, sqlHelper, sqlGenerator, visitorFactory)
{
_executor = executor;
_visitorFactory = visitorFactory;
}
/// <summary>
/// 初始化类<see cref="QueryContext{TModel}"/>。
/// </summary>
/// <param name="sqlHelper">SQL辅助接口。</param>
/// <param name="visitorFactory">表达式解析工厂接口。</param>
/// <param name="sqlGenerator">SQL脚本生成接口。</param>
/// <param name="db">数据库接口。</param>
public QueryContext(ISqlHelper sqlHelper, IExpressionVisitorFactory visitorFactory, IQuerySqlGenerator sqlGenerator, IDbExecutor db)
{
_visitorFactory = visitorFactory;
_sqlGenerator = sqlGenerator;
_db = db;
SqlHelper = sqlHelper;
Entity = typeof(TModel).GetEntityType();
}
/// <summary>
/// 初始化类<see cref="DbContextBase{TModel}"/>。
/// </summary>
/// <param name="executor">数据库执行接口。</param>
/// <param name="logger">日志接口。</param>
/// <param name="sqlHelper">SQL辅助接口。</param>
/// <param name="sqlGenerator">脚本生成器。</param>
/// <param name="visitorFactory">条件表达式解析器工厂实例。</param>
protected DbContextBase(IDbExecutor executor, ILogger logger, ISqlHelper sqlHelper, IQuerySqlGenerator sqlGenerator, IExpressionVisitorFactory visitorFactory)
{
Logger = logger;
SqlHelper = sqlHelper;
SqlGenerator = sqlGenerator;
_executor = executor;
_visitorFactory = visitorFactory;
EntityType = typeof(TModel).GetEntityType();
}
public static IRelationalCommand Generate(
this DbContext dbContext,
SelectExpression databaseExpression,
IReadOnlyDictionary <string, object> parameters = null)
{
IQuerySqlGeneratorFactory sqlGeneratorFactory = dbContext.GetService <IQuerySqlGeneratorFactory>();
IQuerySqlGenerator sqlGenerator = sqlGeneratorFactory.CreateDefault(databaseExpression);
return(sqlGenerator.GenerateSql(parameters ?? new Dictionary <string, object>()));
}
public static Func <DbDataReader, TResult> GetMaterializer <TResult>(
this DbContext dbContext,
SelectExpression databaseExpression,
IReadOnlyDictionary <string, object> parameters = null)
{
IMaterializerFactory materializerFactory = dbContext.GetService <IMaterializerFactory>();
Func <ValueBuffer, object> materializer = (Func <ValueBuffer, object>)materializerFactory
.CreateMaterializer(
entityType: dbContext.Model.FindEntityType(typeof(TResult)),
selectExpression: databaseExpression,
projectionAdder: (property, expression) => expression.AddToProjection(
property, databaseExpression.QuerySource),
typeIndexMap: out _)
.Compile();
IQuerySqlGeneratorFactory sqlGeneratorFactory = dbContext.GetService <IQuerySqlGeneratorFactory>();
IQuerySqlGenerator sqlGenerator = sqlGeneratorFactory.CreateDefault(databaseExpression);
IRelationalValueBufferFactoryFactory valueBufferFactory = dbContext.GetService <IRelationalValueBufferFactoryFactory>();
return(dbReader => (TResult)materializer(sqlGenerator.CreateValueBufferFactory(valueBufferFactory, dbReader).Create(dbReader)));
}