/// <summary>
/// 获取代理方法信息
/// </summary>
/// <param name="method">方法</param>
/// <param name="args">参数列表</param>
/// <returns>SqlProxyMethod</returns>
private SqlProxyMethod GetProxyMethod(MethodInfo method, object[] args)
{
// 判断方法是否贴了注解
if (!method.IsDefined(typeof(SqlProxyAttribute), true))
{
throw Oops.Oh("The method is missing the [SqlProxy] annotation", typeof(InvalidOperationException));
}
// 获取 Sql 代理特性
var sqlProxyAttribute = method.GetCustomAttribute <SqlProxyAttribute>(true);
// 判断是否是异步方法
var isAsyncMethod = method.IsAsync();
// 获取类型返回值并处理 Task 和 Task<T> 类型返回值
var returnType = method.ReturnType;
returnType = isAsyncMethod ? (returnType.GenericTypeArguments.FirstOrDefault() ?? typeof(void)) : returnType;
// 获取数据库上下文
var dbContext = GetDbContext(sqlProxyAttribute.DbContextLocator);
// 转换方法参数
var parameters = method.GetParameters().ToSqlParameters(args);
// 定义最终 Sql 语句
string finalSql;
var commandType = CommandType.Text;
// 如果是存储过程类型
if (sqlProxyAttribute is SqlProduceAttribute sqlProduceAttribute)
{
finalSql = sqlProduceAttribute.Name;
commandType = CommandType.StoredProcedure;
}
// 如果是函数类型
else if (sqlProxyAttribute is SqlFunctionAttribute sqlFunctionAttribute)
{
finalSql = DbHelpers.CombineFunctionSql(dbContext.Database.ProviderName,
returnType.IsRichPrimitive() ? DbFunctionType.Scalar : DbFunctionType.Table,
sqlFunctionAttribute.Name,
parameters);
}
// 如果是纯Sql类型
else if (sqlProxyAttribute is SqlExecuteAttribute sqlExecuteAttribute)
{
finalSql = sqlExecuteAttribute.Sql;
commandType = sqlExecuteAttribute.CommandType;
}
else
{
throw Oops.Oh($"{sqlProxyAttribute.GetType().FullName} is an invalid annotation", typeof(NotSupportedException));
}
// 返回
return(new SqlProxyMethod
{
SqlParameters = parameters,
DbContext = dbContext,
ReturnType = returnType,
IsAsync = isAsyncMethod,
CommandType = commandType,
FinalSql = finalSql
});
}
