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Maximum number of rows in an MS Access database engine table?

由 旧时模样 提交于 2019-11-27 06:39:52
问题 We know the MS Access database engine is 'throttled' to allow a maximum file size of 2GB (or perhaps internally wired to be limited to fewer than some power of 2 of 4KB data pages). But what does this mean in practical terms? To help me measure this, can you tell me the maximum number of rows that can be inserted into a MS Access database engine table? To satisfy the definition of a table, all rows must be unique, therefore a unique constraint (e.g. PRIMARY KEY , UNIQUE , CHECK , Data Macro,

Exporting MS Access Forms and Class / Modules Recursively to text files?

由 ∥☆過路亽．° 提交于 2019-11-27 04:00:16
问题 I found some code on an ancient message board that nicely exports all of the VBA code from classes, modules and forms (see below): Option Explicit Option Compare Database Function SaveToFile() 'Save the code for all modules to files in currentDatabaseDir\Code Dim Name As String Dim WasOpen As Boolean Dim Last As Integer Dim I As Integer Dim TopDir As String, Path As String, FileName As String Dim F As Long 'File for saving code Dim LineCount As Long 'Line count of current module I = InStrRev

I need a workaround for Excel Guessing Data Types problem

由 蓝咒 提交于 2019-11-26 18:27:22
问题 I'm creating a utility to import data from Excel to Oracle database, I have a fixed template for the excel file, Now, when I'm trying to import the data by Jet provider and ADO.Net - Ole connection tools, I found the following problem: there're some columns haven't been imported because there are mixed data types in their columns [string and number], I looked for this problem on the internet I found the reason is guessing data types from Excel The load code: connection = new OleDbConnection(@

Table-less UNION query in MS Access (Jet/ACE)

由 你。 提交于 2019-11-26 10:40:50
This works as expected: SELECT "Mike" AS FName This fails with the error "Query input must contain at least one table or query": SELECT "Mike" AS FName UNION ALL SELECT "John" AS FName Is this just a quirk/limitation of the Jet/ACE database engine or am I missing something? You didn't overlook anything. Access' database engine will allow a single row SELECT without a FROM data source. But if you want to UNION or UNION ALL multiple rows, you must include a FROM ... even if you're not referencing any field from that data source. I created a table with one row and added a check constraint to

Table-less UNION query in MS Access (Jet/ACE)

由 自闭症网瘾萝莉.ら 提交于 2019-11-26 02:14:49
问题 This works as expected: SELECT \"Mike\" AS FName This fails with the error \"Query input must contain at least one table or query\": SELECT \"Mike\" AS FName UNION ALL SELECT \"John\" AS FName Is this just a quirk/limitation of the Jet/ACE database engine or am I missing something? 回答1: You didn't overlook anything. Access' database engine will allow a single row SELECT without a FROM data source. But if you want to UNION or UNION ALL multiple rows, you must include a FROM ... even if you're

Microsoft.Jet.OLEDB.4.0' provider is not registered on the local machine

由 假如想象 提交于 2019-11-26 02:05:46
问题 I created a windows application developed in .NET 3.5 in a 32 bit Windows 2008 server. When deployed the application in a 64 bit server it shows the error \"Microsoft.Jet.OLEDB.4.0\' provider is not registered on the local machine \". So as a solution to this issue, i have changed the build property of the project to X86, so that it will build in 32 bit mode, and rebuild the project in the 32bit machine. But, the same project uses other DB drivers (DB2, SQL etc.) to connect to other databases

Autonumber value of last inserted row - MS Access / VBA

由 |▌冷眼眸甩不掉的悲伤 提交于 2019-11-26 01:59:36
问题 I have a JET table with an auto-number as the primary key, and I would like to know how I can retrieve this number after inserting a row. I have thought of using MAX() to retrieve the row with the highest value, but am not sure how reliable this would be. Some sample code: Dim query As String Dim newRow As Integer query = \"INSERT INTO InvoiceNumbers (date) VALUES (\" & NOW() & \");\" newRow = CurrentDb.Execute(query) Now I know that this wouldn\'t work, since Execute() won\'t return the
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