Examples with SQLServerSelectQueryBlock com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerSelectQueryBlock used on opensource projects

Example 16 with SQLServerSelectQueryBlock

use of com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerSelectQueryBlock in project Mycat-Server by MyCATApache.

the class DruidSelectSqlServerParser method sqlserverParse.

private void sqlserverParse(SchemaConfig schema, RouteResultset rrs) {
    // 使用sqlserver的解析，否则会有部分语法识别错误
    SQLServerStatementParser oracleParser = new SQLServerStatementParser(getCtx().getSql());
    SQLSelectStatement oracleStmt = (SQLSelectStatement) oracleParser.parseStatement();
    SQLSelectQuery oracleSqlSelectQuery = oracleStmt.getSelect().getQuery();
    if (oracleSqlSelectQuery instanceof SQLServerSelectQueryBlock) {
        parseSqlServerPageSql(oracleStmt, rrs, (SQLServerSelectQueryBlock) oracleSqlSelectQuery, schema);
        if (isNeedParseOrderAgg) {
            parseOrderAggGroupSqlServer(schema, oracleStmt, rrs, (SQLServerSelectQueryBlock) oracleSqlSelectQuery);
        }
    }
}

Example 17 with SQLServerSelectQueryBlock

use of com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerSelectQueryBlock in project Mycat-Server by MyCATApache.

the class DruidSelectSqlServerParser method parseSqlServerPageSql.

private void parseSqlServerPageSql(SQLStatement stmt, RouteResultset rrs, SQLServerSelectQueryBlock sqlserverSelectQuery, SchemaConfig schema) {
    // 第一层子查询
    SQLExpr where = sqlserverSelectQuery.getWhere();
    SQLTableSource from = sqlserverSelectQuery.getFrom();
    if (sqlserverSelectQuery.getTop() != null) {
        SQLServerTop top = sqlserverSelectQuery.getTop();
        SQLExpr sqlExpr = top.getExpr();
        if (sqlExpr instanceof SQLIntegerExpr) {
            int topValue = ((SQLIntegerExpr) sqlExpr).getNumber().intValue();
            rrs.setLimitStart(0);
            rrs.setLimitSize(topValue);
        }
    } else if (where instanceof SQLBinaryOpExpr && from instanceof SQLSubqueryTableSource) {
        SQLBinaryOpExpr one = (SQLBinaryOpExpr) where;
        SQLExpr left = one.getLeft();
        SQLBinaryOperator operator = one.getOperator();
        SQLSelectQuery subSelect = ((SQLSubqueryTableSource) from).getSelect().getQuery();
        SQLOrderBy orderBy = null;
        if (subSelect instanceof SQLServerSelectQueryBlock) {
            boolean hasRowNumber = false;
            boolean hasSubTop = false;
            int subTop = 0;
            SQLServerSelectQueryBlock subSelectOracle = (SQLServerSelectQueryBlock) subSelect;
            List<SQLSelectItem> sqlSelectItems = subSelectOracle.getSelectList();
            for (SQLSelectItem sqlSelectItem : sqlSelectItems) {
                SQLExpr sqlExpr = sqlSelectItem.getExpr();
                if (sqlExpr instanceof SQLAggregateExpr) {
                    SQLAggregateExpr agg = (SQLAggregateExpr) sqlExpr;
                    if ("row_number".equalsIgnoreCase(agg.getMethodName()) && agg.getOver() != null) {
                        hasRowNumber = true;
                        orderBy = agg.getOver().getOrderBy();
                    }
                }
            }
            if (subSelectOracle.getFrom() instanceof SQLSubqueryTableSource) {
                SQLSubqueryTableSource subFrom = (SQLSubqueryTableSource) subSelectOracle.getFrom();
                if (subFrom.getSelect().getQuery() instanceof SQLServerSelectQueryBlock) {
                    SQLServerSelectQueryBlock sqlSelectQuery = (SQLServerSelectQueryBlock) subFrom.getSelect().getQuery();
                    if (sqlSelectQuery.getTop() != null) {
                        SQLExpr sqlExpr = sqlSelectQuery.getTop().getExpr();
                        if (sqlExpr instanceof SQLIntegerExpr) {
                            hasSubTop = true;
                            subTop = ((SQLIntegerExpr) sqlExpr).getNumber().intValue();
                            orderBy = subFrom.getSelect().getOrderBy();
                        }
                    }
                }
            }
            if (hasRowNumber) {
                if (hasSubTop && (operator == SQLBinaryOperator.GreaterThan || operator == SQLBinaryOperator.GreaterThanOrEqual) && one.getRight() instanceof SQLIntegerExpr) {
                    SQLIntegerExpr right = (SQLIntegerExpr) one.getRight();
                    int firstrownum = right.getNumber().intValue();
                    if (operator == SQLBinaryOperator.GreaterThanOrEqual && firstrownum != 0) {
                        firstrownum = firstrownum - 1;
                    }
                    int lastrownum = subTop;
                    setLimitIFChange(stmt, rrs, schema, one, firstrownum, lastrownum);
                    if (orderBy != null) {
                        SQLServerSelect oracleSelect = (SQLServerSelect) subSelect.getParent();
                        oracleSelect.setOrderBy(orderBy);
                    }
                    parseOrderAggGroupSqlServer(schema, stmt, rrs, (SQLServerSelectQueryBlock) subSelect);
                    isNeedParseOrderAgg = false;
                } else if ((operator == SQLBinaryOperator.LessThan || operator == SQLBinaryOperator.LessThanOrEqual) && one.getRight() instanceof SQLIntegerExpr) {
                    SQLIntegerExpr right = (SQLIntegerExpr) one.getRight();
                    int firstrownum = right.getNumber().intValue();
                    if (operator == SQLBinaryOperator.LessThan && firstrownum != 0) {
                        firstrownum = firstrownum - 1;
                    }
                    if (subSelect instanceof SQLServerSelectQueryBlock) {
                        rrs.setLimitStart(0);
                        rrs.setLimitSize(firstrownum);
                        // 为了继续解出order by 等
                        sqlserverSelectQuery = (SQLServerSelectQueryBlock) subSelect;
                        if (orderBy != null) {
                            SQLServerSelect oracleSelect = (SQLServerSelect) subSelect.getParent();
                            oracleSelect.setOrderBy(orderBy);
                        }
                        parseOrderAggGroupSqlServer(schema, stmt, rrs, sqlserverSelectQuery);
                        isNeedParseOrderAgg = false;
                    }
                } else if (operator == SQLBinaryOperator.BooleanAnd && left instanceof SQLBinaryOpExpr && one.getRight() instanceof SQLBinaryOpExpr) {
                    SQLBinaryOpExpr leftE = (SQLBinaryOpExpr) left;
                    SQLBinaryOpExpr rightE = (SQLBinaryOpExpr) one.getRight();
                    SQLBinaryOpExpr small = null;
                    SQLBinaryOpExpr larger = null;
                    int firstrownum = 0;
                    int lastrownum = 0;
                    if (leftE.getRight() instanceof SQLIntegerExpr && (leftE.getOperator() == SQLBinaryOperator.GreaterThan || leftE.getOperator() == SQLBinaryOperator.GreaterThanOrEqual)) {
                        small = leftE;
                        firstrownum = ((SQLIntegerExpr) leftE.getRight()).getNumber().intValue();
                        if (leftE.getOperator() == SQLBinaryOperator.GreaterThanOrEqual && firstrownum != 0) {
                            firstrownum = firstrownum - 1;
                        }
                    } else if (leftE.getRight() instanceof SQLIntegerExpr && (leftE.getOperator() == SQLBinaryOperator.LessThan || leftE.getOperator() == SQLBinaryOperator.LessThanOrEqual)) {
                        larger = leftE;
                        lastrownum = ((SQLIntegerExpr) leftE.getRight()).getNumber().intValue();
                        if (leftE.getOperator() == SQLBinaryOperator.LessThan && lastrownum != 0) {
                            lastrownum = lastrownum - 1;
                        }
                    }
                    if (rightE.getRight() instanceof SQLIntegerExpr && (rightE.getOperator() == SQLBinaryOperator.GreaterThan || rightE.getOperator() == SQLBinaryOperator.GreaterThanOrEqual)) {
                        small = rightE;
                        firstrownum = ((SQLIntegerExpr) rightE.getRight()).getNumber().intValue();
                        if (rightE.getOperator() == SQLBinaryOperator.GreaterThanOrEqual && firstrownum != 0) {
                            firstrownum = firstrownum - 1;
                        }
                    } else if (rightE.getRight() instanceof SQLIntegerExpr && (rightE.getOperator() == SQLBinaryOperator.LessThan || rightE.getOperator() == SQLBinaryOperator.LessThanOrEqual)) {
                        larger = rightE;
                        lastrownum = ((SQLIntegerExpr) rightE.getRight()).getNumber().intValue();
                        if (rightE.getOperator() == SQLBinaryOperator.LessThan && lastrownum != 0) {
                            lastrownum = lastrownum - 1;
                        }
                    }
                    if (small != null && larger != null) {
                        setLimitIFChange(stmt, rrs, schema, small, firstrownum, lastrownum);
                        if (orderBy != null) {
                            SQLServerSelect oracleSelect = (SQLServerSelect) subSelect.getParent();
                            oracleSelect.setOrderBy(orderBy);
                        }
                        parseOrderAggGroupSqlServer(schema, stmt, rrs, (SQLServerSelectQueryBlock) subSelect);
                        isNeedParseOrderAgg = false;
                    }
                }
            }
        }
    }
}