使用ADOX创建访问数据库时的数字字段类型为我提供了COMExceptions

时间:2016-04-27 09:12:22

标签: c# ms-access com adox

我尝试使用ADOX命名空间创建Access数据库...

当我将所有字段定义为 ADOX.DataTypeEnum.adVarWChar 以供测试时,一切正常,但现在我试图定义 整数或小数(数字类型),我的代码不再起作用......

我得到的例外是一个恶性循环。

adInteger抛出无效的类型异常, adDecimal throws无效的类型异常, adNumeric throw无效的精度异常

我找不到确定数字字段的正确方法的单一来源!

ADOX.Table table1 = new ADOX.Table();
        ADOX.Key tableKey1 = new Key();
        ADOX.Column idColumn1 = new Column();
        // Define column with AutoIncrement features
        idColumn1.Name = "ID";
        idColumn1.Type = ADOX.DataTypeEnum.adInteger;
        // Set ID as primary key
        tableKey1.Name = "Primary Key";
        tableKey1.Columns.Append("ID");
        tableKey1.Type = KeyTypeEnum.adKeyPrimary;
        //Create the table and it's fields. 
        table1.Name = "Artikli";
        table1.Columns.Append(idColumn1);
        table1.Columns.Append("FLAG", ADOX.DataTypeEnum.adVarWChar, 50);
        table1.Columns.Append("SIFRA", ADOX.DataTypeEnum.adInteger);
        table1.Columns.Append("BARKOD", ADOX.DataTypeEnum.adVarWChar, 50);
        table1.Columns.Append("NAZIV", ADOX.DataTypeEnum.adVarWChar, 50);
        table1.Columns.Append("JM", ADOX.DataTypeEnum.adVarWChar, 50);
        table1.Columns.Append("TB", ADOX.DataTypeEnum.adNumeric);
        table1.Columns.Append("MPC", ADOX.DataTypeEnum.adNumeric);
        table1.Columns.Append("VPC", ADOX.DataTypeEnum.adNumeric);
        table1.Columns.Append("NC", ADOX.DataTypeEnum.adNumeric);
        table1.Columns.Append("ZALIHE", ADOX.DataTypeEnum.adInteger);
        table1.Columns.Append("RG", ADOX.DataTypeEnum.adVarWChar, 50);
        table1.Columns.Append("KALO", ADOX.DataTypeEnum.adInteger);


cat.Create("Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + fileName + "; Jet OLEDB:Engine Type=5");

            // Must create database file before applying autonumber to column
            idColumn.ParentCatalog = cat;
            idColumn.Properties["AutoIncrement"].Value = true;
            idColumn1.ParentCatalog = cat;
            idColumn1.Properties["AutoIncrement"].Value = true;
            idColumn2.ParentCatalog = cat;
            idColumn2.Properties["AutoIncrement"].Value = true;
            idColumn3.ParentCatalog = cat;
            idColumn3.Properties["AutoIncrement"].Value = true;
            idColumn4.ParentCatalog = cat;
            idColumn4.Properties["AutoIncrement"].Value = true;
            idColumn5.ParentCatalog = cat;
            idColumn5.Properties["AutoIncrement"].Value = true;
            idColumn6.ParentCatalog = cat;
            idColumn6.Properties["AutoIncrement"].Value = true;
            idColumn7.ParentCatalog = cat;
            idColumn7.Properties["AutoIncrement"].Value = true;
            idColumn8.ParentCatalog = cat;
            idColumn8.Properties["AutoIncrement"].Value = true;

            cat.Tables.Append(table);
            cat.Tables.Append(table1); // throws exception
            cat.Tables.Append(table2);
            cat.Tables.Append(table3);
            cat.Tables.Append(table4);
            cat.Tables.Append(table5);
            cat.Tables.Append(table6);
            cat.Tables.Append(table7);
            cat.Tables.Append(table8);

1 个答案:

答案 0 :(得分:0)

事实证明我必须为数字类型定义精度... 这是语法,但如果有人知道更简单的语法请分享。

ADOX.Column numeric = new Column();
        numeric.Name = "TB";
        numeric.Type = ADOX.DataTypeEnum.adNumeric;
        numeric.Precision = 17;

table1.Columns.Append(numeric);