Examples with Limit io.shardingjdbc.core.parsing.parser.context.limit.Limit used on opensource projects

Example 46 with Limit

use of io.shardingjdbc.core.parsing.parser.context.limit.Limit in project sharding-jdbc by shardingjdbc.

the class SQLServerTopClauseParser method parse.

/**
 * Parse top.
 *
 * @param selectStatement select statement
 */
public void parse(final SelectStatement selectStatement) {
    if (!lexerEngine.skipIfEqual(SQLServerKeyword.TOP)) {
        return;
    }
    int beginPosition = lexerEngine.getCurrentToken().getEndPosition();
    if (!lexerEngine.skipIfEqual(Symbol.LEFT_PAREN)) {
        beginPosition = lexerEngine.getCurrentToken().getEndPosition() - lexerEngine.getCurrentToken().getLiterals().length();
    }
    SQLExpression sqlExpression = basicExpressionParser.parse(selectStatement);
    lexerEngine.skipIfEqual(Symbol.RIGHT_PAREN);
    LimitValue rowCountValue;
    if (sqlExpression instanceof SQLNumberExpression) {
        int rowCount = ((SQLNumberExpression) sqlExpression).getNumber().intValue();
        rowCountValue = new LimitValue(rowCount, -1, false);
        selectStatement.getSqlTokens().add(new RowCountToken(beginPosition, rowCount));
    } else if (sqlExpression instanceof SQLPlaceholderExpression) {
        rowCountValue = new LimitValue(-1, ((SQLPlaceholderExpression) sqlExpression).getIndex(), false);
    } else {
        throw new SQLParsingException(lexerEngine);
    }
    lexerEngine.unsupportedIfEqual(SQLServerKeyword.PERCENT);
    lexerEngine.skipIfEqual(DefaultKeyword.WITH, SQLServerKeyword.TIES);
    if (null == selectStatement.getLimit()) {
        Limit limit = new Limit(DatabaseType.SQLServer);
        limit.setRowCount(rowCountValue);
        selectStatement.setLimit(limit);
    } else {
        selectStatement.getLimit().setRowCount(rowCountValue);
    }
}