/// <summary>
/// 串联多个参数化查询对象
/// </summary>
/// <param name="firstQuery">第一个参数化查询对象</param>
/// <param name="otherQueries">要串联的其他参数化查询对象</param>
/// <returns>串联后的参数化查询对象</returns>
public static ParameterizedQuery Concat( this ParameterizedQuery firstQuery, params ParameterizedQuery[] otherQueries )
{
var builder = new ParameterizedQueryBuilder();
firstQuery.AppendTo( builder );
foreach ( var query in otherQueries )
{
if ( query == null || string.IsNullOrEmpty( query.TextTemplate ) )
continue;
if ( !builder.IsEndWithWhiteSpace() && !query.IsStartWithWhiteSpace() && Db.AddWhiteSpaceOnConcat )
builder.Append( ' ' );
query.AppendTo( builder );
}
return builder.CreateQuery();
}
/// <summary>
/// 解析查询模板
/// </summary>
/// <param name="builder">参数化查询构建器</param>
/// <param name="templateText">模板文本</param>
/// <param name="args">模板参数</param>
/// <returns>解析结果</returns>
public static ParameterizedQuery ParseTemplate( ParameterizedQueryBuilder builder, string templateText, object[] args )
{
if ( args == null )
throw new ArgumentNullException( "parameters" );
lock ( builder.SyncRoot )
{
for ( var i = 0; i < templateText.Length; i++ )
{
var ch = templateText[i];
if ( ch == '{' )
{
if ( i == templateText.Length - 1 )
throw FormatError( templateText, i );
if ( templateText[i + 1] == '{' )
{
i++;
builder.Append( '{' );
continue;
}
Match match = null;
do
{
match = numberRegex.Match( templateText, i );
if ( match.Success )
{
int parameterIndex;
if ( !int.TryParse( match.Groups["index"].Value, out parameterIndex ) )
throw FormatError( templateText, i );
AddParameter( builder, args[parameterIndex] );
break;
}
match = rangeRegex.Match( templateText, i );
if ( match.Success )
{
int begin, end;
if ( !int.TryParse( match.Groups["begin"].Value, out begin ) )
throw FormatError( templateText, i );
if ( match.Groups["end"] != null )
{
if ( !int.TryParse( match.Groups["end"].Value, out end ) )
throw FormatError( templateText, i );
}
else
end = args.Length - 1;
if ( begin > end || end >= args.Length )
throw FormatError( templateText, i );
AddParameters( builder, args, begin, end );
break;
}
match = allRegex.Match( templateText, i );
if ( match.Success )
{
AddParameters( builder, args, 0, args.Length - 1 );
break;
}
} while ( false );
if ( match == null || !match.Success )
throw FormatError( templateText, i );
i += match.Length - 1;
}
else if ( ch == '}' )
{
if ( i == templateText.Length - 1 )
throw FormatError( templateText, i );
if ( templateText[i + 1] == '}' )
{
i++;
builder.Append( '}' );
continue;
}
}
else
builder.Append( ch );
}
return builder.CreateQuery();
}
}
