数据库模式已更改

本文关键字:模式 数据库 | 更新日期: 2023-09-27 18:10:44

我一直得到这个错误database schema has changed near "1": syntax error

我没有在代码中改变我的模式。这是我创建模式的代码。希望按照你发布的顺序尝试每个答案。此代码用于将数据库传输到另一个数据库程序。因此,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;
        }
    }

这是发生sqlite模式已更改错误的部分。

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);

数据库模式已更改

我认为你应该使用SELECT * FROM .... LIMIT 1而不是SELECT TOP 1 *

您需要检查nameTable是否为空

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

SELECT * FROM Table_Name LIMIT 1;
为SQL

SELECT TOP 1 * FROM Table_Name;

你可以试试这个吗:

SELECT * FROM SAMPLE_TABLE ORDER BY ROWID ASC LIMIT 1