Question

我一直收到此错误database schema has changed near "1": syntax error。

我没有在代码中更改我的架构。这是我制作架构的代码。希望尝试每个答案，以便您发布它。此代码用于将数据库传输到另一个数据库程序。所以它必须与多个数据库程序兼容。

public DataTable GetSchemaTable(string schema, string nameTable)
    {
        switch (m_dbType)
        {
            case dbTypeEnum.Sqlite:
                //Make the schema of the source table
                MakeConnectionString();
                string fullTableName = schema.Length > 0
                    ? string.Format("[{0}].[{1}]", schema, nameTable)
                    : string.Format("[{0}]", nameTable);
                if (!string.IsNullOrEmpty(fullTableName))
                {
                    string sql = string.Format("SELECT * FROM {0} LIMIT 1", fullTableName);
                    DataTable dtSchemaSource;
                    try
                    {
                        using (IDataReader rdr = ReadOnlyForwardOnly(sql))
                        {
                            dtSchemaSource = rdr.GetSchemaTable();
                        }
                    }
                    finally
                    {
                        CloseConnection();
                    }
                    if (dtSchemaSource == null)
                    {
                        throw new RadGeneralException("rdr.GetSchemaTable() returns null with sql = " + sql);
                    }

                    return dtSchemaSource;
                }
                break;

            default:
                //Make the schema of the source table
                MakeConnectionString();
                string fullTableName = schema.Length > 0
                    ? string.Format("[{0}].[{1}]", schema, nameTable)
                    : string.Format("[{0}]", nameTable);
                string sql = string.Format("SELECT TOP 1 * FROM {0}", fullTableName);
                DataTable dtSchemaSource;
                try
                {
                    using (IDataReader rdr = ReadOnlyForwardOnly(sql))
                    {
                        dtSchemaSource = rdr.GetSchemaTable();
                    }
                }
                finally
                {
                    CloseConnection();
                }
                if (dtSchemaSource == null)
                {
                    throw new RadGeneralException("rdr.GetSchemaTable() returns null with sql = " + sql);
                }
                return dtSchemaSource;

        }
    }

这是sqlite架构发生更改的部分发生错误。

StringBuilder sbColList = new StringBuilder();
        nCol = 0;
        identityColInBothTables = false;
        //Make the schema of the source table
        DataTable dtSchemaSource = objDbSource.GetSchemaTable(SchemaSource, Name);
        //Make the schema of the target table
        DataTable dtSchemaTarget = objDbTarget.GetSchemaTable(SchemaTarget, Name);

Answer 1

我认为您需要使用SELECT TOP 1 *

而不是SELECT * FROM .... LIMIT 1

Answer 2

您需要检查nameTable为null或为空

if(!string.IsNullOrEmpty(fullTableName))
 string sql = string.Format("SELECT * FROM {0} LIMIT 1", fullTableName);

for SQLLITE

SELECT * FROM Table_Name LIMIT 1;

for SQL

SELECT TOP 1 * FROM Table_Name;

Answer 3

你可以试试这个：

SELECT * FROM SAMPLE_TABLE ORDER BY ROWID ASC LIMIT 1

数据库架构已更改

3 个答案: