public static TableSchema Schema(this IDataReader reader)
{
var schemaTable = reader.GetSchemaTable();
if (schemaTable == null)
{
return(null);
}
var colNames = schemaTable.Columns.OfType <DataColumn>().Select(c => c.ColumnName).ToHashSet();
var cols = schemaTable.Rows.Cast <DataRow>().Select(r => {
var col = new ColumnSchema();
foreach (var prop in col.GetType().GetProperties(BindingFlags.Instance | BindingFlags.Public))
{
if (colNames.Contains(prop.Name))
{
col.SetPropValue(prop.Name, r[prop.Name]);
}
}
return(col);
});
return(new() {
Columns = cols.ToArray()
});
}
public override string BuildAlterColumnCommand(ColumnSchema schema)
{
// skip pk
if(schema.PrimaryKey) { return string.Empty; }
var sb = new StringBuilder();
if(schema.GetType().IsBoolean()) {
// To ensure that the data format conversion is correct,
// processing data before correction.
sb.AppendFormat(
@"UPDATE {0} SET {1} = '1' WHERE {1} = 'True';
UPDATE {0} SET {1} = '0' WHERE {1} = 'False';",
Api.CommandBuilder.QuoteIdentifier(schema.TableName),
Api.CommandBuilder.QuoteIdentifier(schema.ColumnName)
);
sb.AppendLine();
}
sb.AppendFormat(
@"ALTER TABLE {0} MODIFY {1};",
Api.CommandBuilder.QuoteIdentifier(schema.TableName),
ColumnSqlCommand(schema)
);
string sql = sb.ToString();
return sql;
}
