相关疑难解决方法(0)

如果不存在,我需要添加一个特定的列.我有类似以下内容,但它总是返回false:

IF EXISTS(SELECT *
          FROM   INFORMATION_SCHEMA.COLUMNS
          WHERE  TABLE_NAME = 'myTableName'
                 AND COLUMN_NAME = 'myColumnName') 

如何检查SQL Server数据库的表中是否存在列？

OleDb我使用下面的代码通过连接来连接到 Access 数据库C# .Net

我如何知道硬编码到程序中的表是否确实存在于文件中，以便我可以向用户显示适当的消息？

try
{
    var dbSource = "Data Source = " + source;
    const string dbProvider = "PROVIDER=Microsoft.Jet.OLEDB.4.0;";

    using (var con = new OleDbConnection())
    {
        con.ConnectionString = dbProvider + dbSource;
        con.Open();

        using (var cmd = new OleDbCommand())
        {
            cmd.Connection = con;
            cmd.CommandText = "SELECT * FROM [Concrete Design Table 1]";

            // How do I know the table name is valid? It results in errors when it is not?
            // How to prevent it?
            using (var …