Question

我正在构建VS解决方案，并使用BIML创建了层和c＃代码文件。当我运行每个单独的biml文件时，它们将在查看器中编译并生成输出。当我检查错误时，会引发此错误 “二进制类型的列必须指定正长度或-1来表示最大值。

在我的一个c＃代码文件中，我正在对数据类型执行case语句以切换到SQL数据类型。在此代码页中，我指定二进制列的长度为-1，但仍然收到错误。任何帮助，将不胜感激。

我尝试将-1改为10以及1，但仍然遇到相同的错误。

DataRow.cs文件内容

    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using Varigence.Biml.Extensions;
    public static class DataRow
        {
        public static string GetBiml(this System.Data.DataRow dataRow)
        {
            StringBuilder biml = new StringBuilder("");

            biml.Append("<Column Name=\"")
                .Append(dataRow["ColumnName"])
                .Append("\" DataType=\"")
                .Append(dataRow["DataTypeBiml"])
                .Append("\"");

            if (dataRow["DataTypeBiml"].ToString().Contains("String"))
                biml.Append(" Length=\"").Append(dataRow["CharLength"]).Append("\"");
            else if (dataRow["DataTypeBiml"] == "Decimal")
                biml.Append(" Precision=\"").Append(dataRow["NumericPrecision"]).Append("\" Scale=\"").Append(dataRow["NumericScale"]).Append("\"");
            else if (dataRow["DataTypeBiml"] == "Binary")
                biml.Append(" Length=\"-1 \" ");

            if (dataRow["IsNullable"] != "NO")
                biml.Append(" IsNullable=\"true\"");
            else
                biml.Append(" IsNullable=\"false\"");

            biml.Append(" />");
            return biml.ToString();
        }
    }

1-ReadMetaData.biml

    <#@ template tier="10" #>
    <#@ import namespace="System.Data"#>
    <#@ import namespace="System.Data.SqlClient"#>

        <#@ code file="Helper.cs" #>
        <#@ code file="DataRow.cs" #>

    <#
        string targetConnection = @"Data Source=SERVER;Initial Catalog=DATABASE;Integrated Security=SSPI;"; 
    #>
    <Biml xmlns="http://schemas.varigence.com/biml.xsd">
        <Tables>
            <#
                var sourceTables = Helper.GetIncludedSourceTablesList();

                // Loop through each source table in the included source tables list
                foreach (Table sourceTable in sourceTables) 
                {
            #>
            <Table Name="<#=sourceTable.Name#>" SchemaName="schema">
                <#
                    string targetQuery = @"SELECT OrdinalPosition = col.ORDINAL_POSITION,
                                                ColumnName = col.COLUMN_NAME,
                                                DataType = col.DATA_TYPE,
                                                CharLength = ISNULL(col.CHARACTER_MAXIMUM_LENGTH, 0),
                                                NumericPrecision = col.NUMERIC_PRECISION,
                                                NumericScale = col.NUMERIC_SCALE,
                                                IsNullable = col.IS_NULLABLE,
                                                DataTypeBiml = CASE col.DATA_TYPE
                                                                WHEN 'bigint' THEN 'Int64'
                                                                WHEN 'bit' THEN 'Boolean'
                                                                WHEN 'char' THEN 'AnsiStringFixedLength'
                                                                WHEN 'datetime' THEN 'DateTime'
                                                                WHEN 'decimal' THEN 'Decimal'
                                                                WHEN 'float' THEN 'Double'
                                                                WHEN 'int' THEN 'Int32'
                                                                WHEN 'nchar' THEN 'StringFixedLength'
                                                                WHEN 'nvarchar' THEN 'String'
                                                                WHEN 'smallint' THEN 'Int16'
                                                                WHEN 'timestamp' THEN 'Binary'
                                                                WHEN 'tinyint' THEN 'Byte'
                                                                WHEN 'varchar' THEN 'AnsiString'
                                                                WHEN 'uniqueidentifier' THEN 'Guid'
                                                                ELSE 'Unknown'
                                                              END
                                            FROM (
                                                    SELECT lkup.TABLE_SCHEMA,
                                                        lkup.TABLE_NAME,
                                                        ORDINAL_POSITION_MAX = MAX(lkup.ORDINAL_POSITION)
                                                    FROM INFORMATION_SCHEMA.COLUMNS AS lkup
                                                    WHERE lkup.TABLE_SCHEMA = 'dbo'
                                                            AND lkup.TABLE_NAME = '" + sourceTable.Name + @"'
                                                    GROUP BY lkup.TABLE_SCHEMA,
                                                    lkup.TABLE_NAME
                                                ) AS maxord
                                            INNER JOIN INFORMATION_SCHEMA.COLUMNS AS col ON (maxord.TABLE_SCHEMA = col.TABLE_SCHEMA
                                                                                            AND maxord.TABLE_NAME = col.TABLE_NAME)
                                            ORDER BY col.ORDINAL_POSITION;";


                    DataTable targetTable = new DataTable();
                    SqlDataAdapter targetAdapter = new SqlDataAdapter(targetQuery,targetConnection);
                    targetAdapter.Fill(targetTable);
                #>
                <Columns>
                    <# foreach (DataRow targetRow in targetTable.Rows) {#>
                    <#=targetRow.GetBiml()#>
                    <# } #>
                </Columns>    
            </Table>
            <# } #>
        </Tables>
    </Biml>

TableList.cs文件内容

    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using Varigence.Biml.Extensions;
    public class Helper
    {
        public static List<Table> GetIncludedSourceTablesList()
        {
            var tablesList = new List<Table>
            {
                new Table() { Name = "Tab1"},
                new Table() { Name = "Tab2" },
                new Table() { Name = "Tab3" },
                new Table() { Name = "Tab4" },
                new Table() { Name = "Tab5" },
                new Table() { Name = "Tab6" }
            };

            return tablesList;
        }
    }

    public class Table
    {
        public string Name { get; set; }
    }

这是ReadMetaData.biml文件的查看器中输出的一部分，该输出没有将长度放在二进制列上

    <Column Name="RowVers" DataType="Binary" IsNullable="true" />

Answer 1

查看您的代码，可能很简单，就像在-1之后有一个尾随空格一样，由于其无效值，它可能会丢弃Length属性：

所以这个：

biml.Append(" Length=\"-1 \" ");

应该变成这个：

biml.Append(" Length=\"-1\" ");

Answer 2

我发现了错误，一旦正确输入长度，我就没有将DataTypeBiml转换为字符串来进行比较。

else if (dataRow["DataTypeBiml"].ToString() == "Binary")
        biml.Append(" Length=\"-1\"");

感谢您的建议

最大值的二进制类型-1列

2 个答案: