static IEnumerable <string> ProcessTable(Mssql mssql, TableInfo table, int batchSize)
{
var sb = new StringBuilder();
var query = $"select * from {mssql.Database}.{table.TABLE_SCHEMA}.{table.TABLE_NAME}";
var actualData = mssql.ExecuteReader(query, reader =>
{
var dict = new Dictionary <string, CellValue>();
for (var i = 0; i < reader.FieldCount; i++)
{
var fieldName = reader.GetName(i);
var fieldType = reader.GetFieldType(i);
var fieldValue = reader[i];
var cell = new CellValue(fieldValue, fieldType);
dict.Add(fieldName, cell);
}
return(dict);
});
foreach (var dArr in actualData.Batch(batchSize))
{
if (dArr.Length > 0)
{
sb.Append($@"insert into ""{table.TABLE_NAME}"" (");
var columns = dArr[0].Keys.ToArray();
sb.Append(string.Join(",", columns.Select(c => $@"""{c}""")));
sb.Append(") values");
var first = true;
foreach (var d in dArr)
{
if (!first)
{
sb.Append(",");
}
first = false;
sb.Append("(");
sb.Append(string.Join(",", d.Values.Select(c => c.ToSql())));
sb.Append(")");
}
}
sb.Append(";");
yield return(sb.ToString());
sb.Clear();
}
}
private static void Migrate(string @from, string to, int batch, string output, bool?execute,
IConsole console)
{
void log(string line)
{
console.Out.WriteLine("[INFO]\t" + line);
}
void error(Exception e)
{
console.Out.WriteLine("[ERROR]\t" + e.Message);
}
log("testing connection to mssql server...");
Mssql mssql;
try
{
mssql = new Mssql(@from);
log("ok");
}
catch (Exception e)
{
error(e);
return;
}
if (!string.IsNullOrWhiteSpace(to))
{
PgSql pgSql;
log("testing connection to pgsql server...");
try
{
pgSql = new PgSql(to, null);
log("ok");
}
catch (Exception e)
{
error(e);
return;
}
log("getting tables list from mssql server...");
TableInfo[] tables;
try
{
tables = mssql.GetTablesList();
}
catch (Exception e)
{
error(e);
return;
}
TextWriter tw = null;
if (!string.IsNullOrWhiteSpace(output))
{
if (File.Exists(output))
{
File.Delete(output);
}
tw = new StreamWriter(File.OpenWrite(output));
}
foreach (var table in tables)
{
log("processing table " + table.TABLE_SCHEMA + "." + table.TABLE_NAME);
pgSql.ExecuteNonQuery($@"truncate table ""{table.TABLE_NAME}""");
var sqlList = ProcessTable(mssql, table, batch);
var counter = 1;
foreach (var sql in sqlList)
{
tw?.Write(sql);
++counter;
log("executing next batch...");
try
{
var result = pgSql.ExecuteNonQuery(sql);
log($"{counter}:\t{result} row(s) affected.");
}
catch (Exception e)
{
tw?.Flush();
tw?.Close();
error(e);
Console.ReadKey();
}
tw?.Write(sql);
tw?.Flush();
}
tw?.Flush();
}
tw?.Close();
}
}
