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Fully parsing where clause with JSqlParser


By : Helliot
Date : October 17 2020, 01:08 AM
around this issue I would like to completely, and succinctly, parse a SQL where clause using JSqlParser. It's easy to parse it into individual conditional statements like so , Using ExpressionVisitorAdapter, you could overwrite
code :
protected void visitBinaryExpression(BinaryExpression expr)
    String whereClause = "a=3 AND b=4 AND c=5 AND d>5 AND x<10";
    Expression expr = CCJSqlParserUtil.parseCondExpression(whereClause);
    expr.accept(new ExpressionVisitorAdapter() {

        @Override
        protected void visitBinaryExpression(BinaryExpression expr) {
            if (expr instanceof ComparisonOperator) {
                System.out.println("left=" + expr.getLeftExpression() + "  op=" +  expr.getStringExpression() + "  right=" + expr.getRightExpression());
            }

            super.visitBinaryExpression(expr); 
        }
    });
left=a  op==  right=3
left=b  op==  right=4
left=c  op==  right=5
left=d  op=>  right=5
left=x  op=<  right=10


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Is There a Benefit to Using Fully Qualified Namespaces in the Uses Clause?


By : Muniraj
Date : March 29 2020, 07:55 AM
like below fixes the issue It really depends on what you're building. If it's a simple VCL application as Delphi is most known for, then you usually don't need to worry about it. However, if you're building a package, with components for example, you need to be sure to clearly define which environment you intend to use: VCL or FMX. Embarcadero added namespace prefixes to be able to differentiate different possible solutions.
However, in most scenarios, the . only serves as a visual representation. It helps you, the coder, be able to identify which libraries you're using.

How to get Select clause's body with JSQLParser


By : Kyle-LoginRadius
Date : March 29 2020, 07:55 AM
will be helpful for those in need SelectBody is of type PlainSelect. This is not equivalent to the SelectItems which you want to get. This is an example for getting these items:
code :
String sqlStr = "SELECT mytable alias FROM mytable";
Select select = (Select)CCJSqlParserUtil.parse(sqlStr);
System.out.println(select.getSelectBody());

PlainSelect pl = (PlainSelect)select.getSelectBody();
for (SelectItem item : pl.getSelectItems()) {
    System.out.println(item.toString());
}

How Can I get multiple Sub queries from "From Clause" using JSQLparser ?


By : Krishna. A
Date : March 29 2020, 07:55 AM
around this issue So here is a little code snipped. You have to know, that the first table/subselect is stored within the fromItem from your PlainSelect and the followings within the joins. You have to process both. Thats due to the parsing architecture JSqlParser uses.
Within JSqlParser you have two types of traversing the returned object hierarchy: 1. visitor pattern, 2. direct object hierarchy access. I implemented both within this little example.
code :
public class SimpleSqlParser10 {
    public static void main(String args[]) throws JSQLParserException {
        String sql = "SELECT * FROM myTable, (select * from myTable2) as data1, (select b from myTable3) as data2";
        Select select = (Select)CCJSqlParserUtil.parse(sql);
        System.out.println(select.toString());


        System.out.println("Type 1: Visitor processing");
        select.getSelectBody().accept(new SelectVisitorAdapter(){
            @Override
            public void visit(PlainSelect plainSelect) {
                plainSelect.getFromItem().accept(fromVisitor);
                if (plainSelect.getJoins()!=null)
                   plainSelect.getJoins().forEach(join -> join.getRightItem().accept(fromVisitor));
            }
        });

        System.out.println("Type 2: simple method calls");
        processFromItem(((PlainSelect)select.getSelectBody()).getFromItem());
        if (((PlainSelect)select.getSelectBody()).getJoins()!=null)
            ((PlainSelect)select.getSelectBody()).getJoins().forEach(join -> processFromItem(join.getRightItem()));


        System.out.println("Type 3: hierarchically process all subselects");
        select.getSelectBody().accept(new SelectDeParser() {
            @Override
            public void visit(SubSelect subSelect) {
                System.out.println("  found subselect=" + subSelect.toString());
                super.visit(subSelect);             }
        });
    }

    private final static FromItemVisitorAdapter fromVisitor = new FromItemVisitorAdapter() {
        @Override
        public void visit(SubSelect subSelect) {
            System.out.println("subselect=" + subSelect);
        }

        @Override
        public void visit(Table table) {
            System.out.println("table=" + table);
        }
    } ;

    private static void processFromItem(FromItem fromItem) {
        System.out.println("fromItem=" + fromItem);
    }
}
SELECT * FROM myTable, (SELECT * FROM myTable2) AS data1, (SELECT b FROM myTable3) AS data2
Type 1: Visitor processing
table=myTable
subselect=(SELECT * FROM myTable2) AS data1
subselect=(SELECT b FROM myTable3) AS data2
Type 2: simple method calls
fromItem=myTable
fromItem=(SELECT * FROM myTable2) AS data1
fromItem=(SELECT b FROM myTable3) AS data2
Type 3: hierarchically process all subselects
  found subselect=(SELECT * FROM myTable2) AS data1
  found subselect=(SELECT b FROM myTable3) AS data2

Baffling SQL Parsing Issue: WHERE clause parsing ends before all conditions


By : Phạm Trung Nguyên
Date : March 29 2020, 07:55 AM
it should still fix some issue It looks like AND isn't the problem - the first AND got parsed properly in fact: (expression_tail (common_clause_token AND).
However, I see no definition that would accept NOT ().

Chrome not fully parsing CDN


By : user2524527
Date : March 29 2020, 07:55 AM
hope this fix your issue it's Frans from Staticaly. This issue was detected under our side and not Chrome, and already resolved by our team. Let me know if you have any questions.
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