Examples with SQLSelectItem com.alibaba.druid.sql.ast.statement.SQLSelectItem used on opensource projects

Example 31 with SQLSelectItem

use of com.alibaba.druid.sql.ast.statement.SQLSelectItem in project Mycat_plus by coderczp.

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;
                    }
                }
            }
        }
    }
}

Example 32 with SQLSelectItem

use of com.alibaba.druid.sql.ast.statement.SQLSelectItem in project Mycat_plus by coderczp.

the class MycatSchemaStatVisitor method visit.

/* 
     *  遇到 some 将子查询改写成  SELECT MIN(name) FROM subtest1
     *  例如:
     *        select * from subtest where id > some (select name from subtest1);
     *    >/>= some ----> >/>= min
     *    </<= some ----> </<= max
     *    <>   some ----> not in
     *    =    some ----> in
     *    other  不改写
     */
@Override
public boolean visit(SQLSomeExpr x) {
    setSubQueryRelationOrFlag(x);
    List<SQLSelectItem> itemlist = ((SQLSelectQueryBlock) (x.getSubQuery().getQuery())).getSelectList();
    SQLExpr sexpr = itemlist.get(0).getExpr();
    if (x.getParent() instanceof SQLBinaryOpExpr) {
        SQLBinaryOpExpr parentExpr = (SQLBinaryOpExpr) x.getParent();
        SQLAggregateExpr saexpr = null;
        switch(parentExpr.getOperator()) {
            case GreaterThan:
            case GreaterThanOrEqual:
            case NotLessThan:
                this.hasChange = true;
                if (sexpr instanceof SQLIdentifierExpr || (sexpr instanceof SQLPropertyExpr && ((SQLPropertyExpr) sexpr).getOwner() instanceof SQLIdentifierExpr)) {
                    saexpr = new SQLAggregateExpr("MIN");
                    saexpr.getArguments().add(sexpr);
                    saexpr.setParent(itemlist.get(0));
                    itemlist.get(0).setExpr(saexpr);
                }
                SQLQueryExpr maxSubQuery = new SQLQueryExpr(x.getSubQuery());
                x.getSubQuery().setParent(maxSubQuery);
                // 生成新的SQLQueryExpr 替换当前 SQLAllExpr 节点
                if (x.getParent() instanceof SQLBinaryOpExpr) {
                    if (((SQLBinaryOpExpr) x.getParent()).getLeft().equals(x)) {
                        ((SQLBinaryOpExpr) x.getParent()).setLeft(maxSubQuery);
                    } else if (((SQLBinaryOpExpr) x.getParent()).getRight().equals(x)) {
                        ((SQLBinaryOpExpr) x.getParent()).setRight(maxSubQuery);
                    }
                }
                addSubQuerys(x.getSubQuery());
                return super.visit(x.getSubQuery());
            case LessThan:
            case LessThanOrEqual:
            case NotGreaterThan:
                this.hasChange = true;
                if (sexpr instanceof SQLIdentifierExpr || (sexpr instanceof SQLPropertyExpr && ((SQLPropertyExpr) sexpr).getOwner() instanceof SQLIdentifierExpr)) {
                    saexpr = new SQLAggregateExpr("MAX");
                    saexpr.getArguments().add(sexpr);
                    saexpr.setParent(itemlist.get(0));
                    itemlist.get(0).setExpr(saexpr);
                }
                // 生成新的SQLQueryExpr 替换当前 SQLAllExpr 节点
                SQLQueryExpr minSubQuery = new SQLQueryExpr(x.getSubQuery());
                x.getSubQuery().setParent(minSubQuery);
                if (x.getParent() instanceof SQLBinaryOpExpr) {
                    if (((SQLBinaryOpExpr) x.getParent()).getLeft().equals(x)) {
                        ((SQLBinaryOpExpr) x.getParent()).setLeft(minSubQuery);
                    } else if (((SQLBinaryOpExpr) x.getParent()).getRight().equals(x)) {
                        ((SQLBinaryOpExpr) x.getParent()).setRight(minSubQuery);
                    }
                }
                addSubQuerys(x.getSubQuery());
                return super.visit(x.getSubQuery());
            case LessThanOrGreater:
            case NotEqual:
                this.hasChange = true;
                SQLInSubQueryExpr notInSubQueryExpr = new SQLInSubQueryExpr(x.getSubQuery());
                x.getSubQuery().setParent(notInSubQueryExpr);
                notInSubQueryExpr.setNot(true);
                // 生成新的SQLQueryExpr 替换当前 SQLAllExpr 节点
                if (x.getParent() instanceof SQLBinaryOpExpr) {
                    SQLBinaryOpExpr xp = (SQLBinaryOpExpr) x.getParent();
                    if (xp.getLeft().equals(x)) {
                        notInSubQueryExpr.setExpr(xp.getRight());
                    } else if (xp.getRight().equals(x)) {
                        notInSubQueryExpr.setExpr(xp.getLeft());
                    }
                    if (xp.getParent() instanceof MySqlSelectQueryBlock) {
                        ((MySqlSelectQueryBlock) xp.getParent()).setWhere(notInSubQueryExpr);
                    } else if (xp.getParent() instanceof SQLBinaryOpExpr) {
                        SQLBinaryOpExpr pp = ((SQLBinaryOpExpr) xp.getParent());
                        if (pp.getLeft().equals(xp)) {
                            pp.setLeft(notInSubQueryExpr);
                        } else if (pp.getRight().equals(xp)) {
                            pp.setRight(notInSubQueryExpr);
                        }
                    }
                }
                addSubQuerys(x.getSubQuery());
                return super.visit(notInSubQueryExpr);
            case Equality:
                this.hasChange = true;
                SQLInSubQueryExpr inSubQueryExpr = new SQLInSubQueryExpr(x.getSubQuery());
                x.getSubQuery().setParent(inSubQueryExpr);
                inSubQueryExpr.setNot(false);
                // 生成新的SQLQueryExpr 替换当前 SQLAllExpr 节点
                if (x.getParent() instanceof SQLBinaryOpExpr) {
                    SQLBinaryOpExpr xp = (SQLBinaryOpExpr) x.getParent();
                    if (xp.getLeft().equals(x)) {
                        inSubQueryExpr.setExpr(xp.getRight());
                    } else if (xp.getRight().equals(x)) {
                        inSubQueryExpr.setExpr(xp.getLeft());
                    }
                    if (xp.getParent() instanceof MySqlSelectQueryBlock) {
                        ((MySqlSelectQueryBlock) xp.getParent()).setWhere(inSubQueryExpr);
                    } else if (xp.getParent() instanceof SQLBinaryOpExpr) {
                        SQLBinaryOpExpr pp = ((SQLBinaryOpExpr) xp.getParent());
                        if (pp.getLeft().equals(xp)) {
                            pp.setLeft(inSubQueryExpr);
                        } else if (pp.getRight().equals(xp)) {
                            pp.setRight(inSubQueryExpr);
                        }
                    }
                }
                addSubQuerys(x.getSubQuery());
                return super.visit(inSubQueryExpr);
            default:
                break;
        }
    }
    addSubQuerys(x.getSubQuery());
    return super.visit(x);
}

Example 33 with SQLSelectItem

use of com.alibaba.druid.sql.ast.statement.SQLSelectItem in project Mycat_plus by coderczp.

the class MycatSchemaStatVisitor method visit.

/* 
     *  遇到 any 将子查询改写成  SELECT MIN(name) FROM subtest1
     *  例如:
     *    select * from subtest where id oper any (select name from subtest1);
     *    >/>= any ----> >/>= min
     *    </<= any ----> </<= max
     *    <>   any ----> not in
     *    =    some ----> in
     *    other  不改写
     */
@Override
public boolean visit(SQLAnyExpr x) {
    setSubQueryRelationOrFlag(x);
    List<SQLSelectItem> itemlist = ((SQLSelectQueryBlock) (x.getSubQuery().getQuery())).getSelectList();
    SQLExpr sexpr = itemlist.get(0).getExpr();
    if (x.getParent() instanceof SQLBinaryOpExpr) {
        SQLBinaryOpExpr parentExpr = (SQLBinaryOpExpr) x.getParent();
        SQLAggregateExpr saexpr = null;
        switch(parentExpr.getOperator()) {
            case GreaterThan:
            case GreaterThanOrEqual:
            case NotLessThan:
                this.hasChange = true;
                if (sexpr instanceof SQLIdentifierExpr || (sexpr instanceof SQLPropertyExpr && ((SQLPropertyExpr) sexpr).getOwner() instanceof SQLIdentifierExpr)) {
                    saexpr = new SQLAggregateExpr("MIN");
                    saexpr.getArguments().add(sexpr);
                    saexpr.setParent(itemlist.get(0));
                    itemlist.get(0).setExpr(saexpr);
                }
                SQLQueryExpr maxSubQuery = new SQLQueryExpr(x.getSubQuery());
                x.getSubQuery().setParent(maxSubQuery);
                // 生成新的SQLQueryExpr 替换当前 SQLAllExpr 节点
                if (x.getParent() instanceof SQLBinaryOpExpr) {
                    if (((SQLBinaryOpExpr) x.getParent()).getLeft().equals(x)) {
                        ((SQLBinaryOpExpr) x.getParent()).setLeft(maxSubQuery);
                    } else if (((SQLBinaryOpExpr) x.getParent()).getRight().equals(x)) {
                        ((SQLBinaryOpExpr) x.getParent()).setRight(maxSubQuery);
                    }
                }
                addSubQuerys(x.getSubQuery());
                return super.visit(x.getSubQuery());
            case LessThan:
            case LessThanOrEqual:
            case NotGreaterThan:
                this.hasChange = true;
                if (sexpr instanceof SQLIdentifierExpr || (sexpr instanceof SQLPropertyExpr && ((SQLPropertyExpr) sexpr).getOwner() instanceof SQLIdentifierExpr)) {
                    saexpr = new SQLAggregateExpr("MAX");
                    saexpr.getArguments().add(sexpr);
                    saexpr.setParent(itemlist.get(0));
                    itemlist.get(0).setExpr(saexpr);
                }
                // 生成新的SQLQueryExpr 替换当前 SQLAllExpr 节点
                SQLQueryExpr minSubQuery = new SQLQueryExpr(x.getSubQuery());
                x.subQuery.setParent(minSubQuery);
                if (x.getParent() instanceof SQLBinaryOpExpr) {
                    if (((SQLBinaryOpExpr) x.getParent()).getLeft().equals(x)) {
                        ((SQLBinaryOpExpr) x.getParent()).setLeft(minSubQuery);
                    } else if (((SQLBinaryOpExpr) x.getParent()).getRight().equals(x)) {
                        ((SQLBinaryOpExpr) x.getParent()).setRight(minSubQuery);
                    }
                }
                addSubQuerys(x.getSubQuery());
                return super.visit(x.getSubQuery());
            case LessThanOrGreater:
            case NotEqual:
                this.hasChange = true;
                SQLInSubQueryExpr notInSubQueryExpr = new SQLInSubQueryExpr(x.getSubQuery());
                x.getSubQuery().setParent(notInSubQueryExpr);
                notInSubQueryExpr.setNot(true);
                // 生成新的SQLQueryExpr 替换当前 SQLAllExpr 节点
                if (x.getParent() instanceof SQLBinaryOpExpr) {
                    SQLBinaryOpExpr xp = (SQLBinaryOpExpr) x.getParent();
                    if (xp.getLeft().equals(x)) {
                        notInSubQueryExpr.setExpr(xp.getRight());
                    } else if (xp.getRight().equals(x)) {
                        notInSubQueryExpr.setExpr(xp.getLeft());
                    }
                    if (xp.getParent() instanceof MySqlSelectQueryBlock) {
                        ((MySqlSelectQueryBlock) xp.getParent()).setWhere(notInSubQueryExpr);
                    } else if (xp.getParent() instanceof SQLBinaryOpExpr) {
                        SQLBinaryOpExpr pp = ((SQLBinaryOpExpr) xp.getParent());
                        if (pp.getLeft().equals(xp)) {
                            pp.setLeft(notInSubQueryExpr);
                        } else if (pp.getRight().equals(xp)) {
                            pp.setRight(notInSubQueryExpr);
                        }
                    }
                }
                addSubQuerys(x.getSubQuery());
                return super.visit(notInSubQueryExpr);
            case Equality:
                this.hasChange = true;
                SQLInSubQueryExpr inSubQueryExpr = new SQLInSubQueryExpr(x.getSubQuery());
                x.getSubQuery().setParent(inSubQueryExpr);
                inSubQueryExpr.setNot(false);
                // 生成新的SQLQueryExpr 替换当前 SQLAllExpr 节点
                if (x.getParent() instanceof SQLBinaryOpExpr) {
                    SQLBinaryOpExpr xp = (SQLBinaryOpExpr) x.getParent();
                    if (xp.getLeft().equals(x)) {
                        inSubQueryExpr.setExpr(xp.getRight());
                    } else if (xp.getRight().equals(x)) {
                        inSubQueryExpr.setExpr(xp.getLeft());
                    }
                    if (xp.getParent() instanceof MySqlSelectQueryBlock) {
                        ((MySqlSelectQueryBlock) xp.getParent()).setWhere(inSubQueryExpr);
                    } else if (xp.getParent() instanceof SQLBinaryOpExpr) {
                        SQLBinaryOpExpr pp = ((SQLBinaryOpExpr) xp.getParent());
                        if (pp.getLeft().equals(xp)) {
                            pp.setLeft(inSubQueryExpr);
                        } else if (pp.getRight().equals(xp)) {
                            pp.setRight(inSubQueryExpr);
                        }
                    }
                }
                addSubQuerys(x.getSubQuery());
                return super.visit(inSubQueryExpr);
            default:
                break;
        }
    }
    addSubQuerys(x.getSubQuery());
    return super.visit(x);
}

Example 34 with SQLSelectItem

use of com.alibaba.druid.sql.ast.statement.SQLSelectItem in project Mycat_plus by coderczp.

the class SQLQueryResultHandler method dohandler.

@Override
public String dohandler(SQLStatement statement, SQLSelect sqlselect, SQLObject parent, List param) {
    if (parent.getParent() instanceof SQLBinaryOpExpr) {
        SQLBinaryOpExpr pp = (SQLBinaryOpExpr) parent.getParent();
        SQLExprImpl listExpr = null;
        if (null == param || param.isEmpty()) {
            listExpr = new SQLNullExpr();
        } else {
            listExpr = new SQLListExpr();
            ((SQLListExpr) listExpr).getItems().addAll(param);
        }
        if (pp.getLeft().equals(parent)) {
            pp.setLeft(listExpr);
        } else if (pp.getRight().equals(parent)) {
            pp.setRight(listExpr);
        }
    } else if (parent.getParent() instanceof SQLSelectItem) {
        SQLSelectItem pp = (SQLSelectItem) parent.getParent();
        SQLExprImpl listExpr = null;
        if (null == param || param.isEmpty()) {
            listExpr = new SQLNullExpr();
        } else {
            listExpr = new SQLListExpr();
            ((SQLListExpr) listExpr).getItems().addAll(param);
        }
        pp.setExpr(listExpr);
    } else if (parent.getParent() instanceof SQLSelectGroupByClause) {
        SQLSelectGroupByClause pp = (SQLSelectGroupByClause) parent.getParent();
        List<SQLExpr> items = pp.getItems();
        for (int i = 0; i < items.size(); i++) {
            SQLExpr expr = items.get(i);
            if (expr instanceof SQLQueryExpr && ((SQLQueryExpr) expr).getSubQuery().equals(sqlselect)) {
                SQLExprImpl listExpr = null;
                if (null == param || param.isEmpty()) {
                    listExpr = new SQLNullExpr();
                } else {
                    listExpr = new SQLListExpr();
                    ((SQLListExpr) listExpr).getItems().addAll(param);
                }
                items.set(i, listExpr);
            }
        }
    } else if (parent.getParent() instanceof SQLSelectOrderByItem) {
        SQLSelectOrderByItem orderItem = (SQLSelectOrderByItem) parent.getParent();
        SQLExprImpl listExpr = null;
        if (null == param || param.isEmpty()) {
            listExpr = new SQLNullExpr();
        } else {
            listExpr = new SQLListExpr();
            ((SQLListExpr) listExpr).getItems().addAll(param);
        }
        listExpr.setParent(orderItem);
        orderItem.setExpr(listExpr);
    } else if (parent.getParent() instanceof MySqlSelectQueryBlock) {
        MySqlSelectQueryBlock query = (MySqlSelectQueryBlock) parent.getParent();
        // select * from subtest1 a where (select 1 from subtest3); 这种情况会进入到当前分支.
        // 改写为   select * from subtest1 a where (1); 或  select * from subtest1 a where (null);
        SQLExprImpl listExpr = null;
        if (null == param || param.isEmpty()) {
            listExpr = new SQLNullExpr();
        } else {
            listExpr = new SQLListExpr();
            ((SQLListExpr) listExpr).getItems().addAll(param);
        }
        listExpr.setParent(query);
        query.setWhere(listExpr);
    }
    return statement.toString();
}

Example 35 with SQLSelectItem

use of com.alibaba.druid.sql.ast.statement.SQLSelectItem in project dble by actiontech.

the class SelectHandler method isSupportSelect.

private static boolean isSupportSelect(String stmt) {
    SQLStatementParser parser = new MySqlStatementParser(stmt);
    SQLStatement statement = parser.parseStatement();
    if (!(statement instanceof SQLSelectStatement)) {
        return false;
    }
    SQLSelectQuery sqlSelectQuery = ((SQLSelectStatement) statement).getSelect().getQuery();
    if (!(sqlSelectQuery instanceof MySqlSelectQueryBlock)) {
        return false;
    }
    MySqlSelectQueryBlock selectQueryBlock = (MySqlSelectQueryBlock) sqlSelectQuery;
    SQLTableSource mysqlFrom = selectQueryBlock.getFrom();
    if (mysqlFrom != null) {
        return false;
    }
    for (SQLSelectItem item : selectQueryBlock.getSelectList()) {
        SQLExpr selectItem = item.getExpr();
        if (!isVariantRef(selectItem)) {
            return false;
        }
    }
    return true;
}