SQL Join on bound variable
I have a dynamically generated SQL Query being built in Java. The way it is being built is by having an array of parameters to be bound and a dynamically created String representing the query. Something like this:
List<String> bindVariables;
String query = "Select * from TABLE where id = ?";
After the query is finished being created. the variables are bound in based on their index in the array. Like this:
query = selectPortion + fromPortion + wherePortion;
// Bind all parameters
for (int i = 0; i < bindVariables.size(); i++) {
queryStatement.setNString(i + 1, bindVariables.get(i));
}
And then the query is executed.
This works fine when we are just binding variables to the WHERE clause, as it is simply just adding the condition and the variable to the end of the array. However, the issue is when I want to JOIN on a variable after the array already has some values.
wherePortion += "and table1.id = ? ";
bindVariables.add("15");
wherePortion += "and table2.color = ? ";
bindVariables.add("blue");
fromPortion += "INNER JOIN table3 on table3.size = ? ";
bindVariables.add(); //Here is the issue
Is there a recommended way to approach this situation?
java sql
asked Nov 13 '18 at 15:09
user2827048user2827048
92114
add a comment |
I have a dynamically generated SQL Query being built in Java. The way it is being built is by having an array of parameters to be bound and a dynamically created String representing the query. Something like this:
List<String> bindVariables;
String query = "Select * from TABLE where id = ?";
After the query is finished being created. the variables are bound in based on their index in the array. Like this:
query = selectPortion + fromPortion + wherePortion;
// Bind all parameters
for (int i = 0; i < bindVariables.size(); i++) {
queryStatement.setNString(i + 1, bindVariables.get(i));
}
And then the query is executed.
This works fine when we are just binding variables to the WHERE clause, as it is simply just adding the condition and the variable to the end of the array. However, the issue is when I want to JOIN on a variable after the array already has some values.
wherePortion += "and table1.id = ? ";
bindVariables.add("15");
wherePortion += "and table2.color = ? ";
bindVariables.add("blue");
fromPortion += "INNER JOIN table3 on table3.size = ? ";
bindVariables.add(); //Here is the issue
Is there a recommended way to approach this situation?
java sql
asked Nov 13 '18 at 15:09
user2827048user2827048
92114
You're not going toJOINon a variable condition. YourJOINcriteria fortable3to whatever table you're joining to will always be the same, so I don't see how you need to dynamically create a join based on a variable.
– msturek
Nov 13 '18 at 15:25
add a comment |
I have a dynamically generated SQL Query being built in Java. The way it is being built is by having an array of parameters to be bound and a dynamically created String representing the query. Something like this:
List<String> bindVariables;
String query = "Select * from TABLE where id = ?";
After the query is finished being created. the variables are bound in based on their index in the array. Like this:
query = selectPortion + fromPortion + wherePortion;
// Bind all parameters
for (int i = 0; i < bindVariables.size(); i++) {
queryStatement.setNString(i + 1, bindVariables.get(i));
}
And then the query is executed.
This works fine when we are just binding variables to the WHERE clause, as it is simply just adding the condition and the variable to the end of the array. However, the issue is when I want to JOIN on a variable after the array already has some values.
wherePortion += "and table1.id = ? ";
bindVariables.add("15");
wherePortion += "and table2.color = ? ";
bindVariables.add("blue");
fromPortion += "INNER JOIN table3 on table3.size = ? ";
bindVariables.add(); //Here is the issue
Is there a recommended way to approach this situation?
java sql
asked Nov 13 '18 at 15:09
user2827048user2827048
92114
I have a dynamically generated SQL Query being built in Java. The way it is being built is by having an array of parameters to be bound and a dynamically created String representing the query. Something like this:
List<String> bindVariables;
String query = "Select * from TABLE where id = ?";
After the query is finished being created. the variables are bound in based on their index in the array. Like this:
query = selectPortion + fromPortion + wherePortion;
// Bind all parameters
for (int i = 0; i < bindVariables.size(); i++) {
queryStatement.setNString(i + 1, bindVariables.get(i));
}
And then the query is executed.
This works fine when we are just binding variables to the WHERE clause, as it is simply just adding the condition and the variable to the end of the array. However, the issue is when I want to JOIN on a variable after the array already has some values.
wherePortion += "and table1.id = ? ";
bindVariables.add("15");
wherePortion += "and table2.color = ? ";
bindVariables.add("blue");
fromPortion += "INNER JOIN table3 on table3.size = ? ";
bindVariables.add(); //Here is the issue
Is there a recommended way to approach this situation?
java sql
java sql
asked Nov 13 '18 at 15:09
user2827048user2827048
92114
asked Nov 13 '18 at 15:09
user2827048user2827048
92114
asked Nov 13 '18 at 15:09
user2827048user2827048
92114
asked Nov 13 '18 at 15:09
user2827048user2827048
92114
asked Nov 13 '18 at 15:09
user2827048user2827048
92114
92114
You're not going toJOINon a variable condition. YourJOINcriteria fortable3to whatever table you're joining to will always be the same, so I don't see how you need to dynamically create a join based on a variable.
– msturek
Nov 13 '18 at 15:25
add a comment |
You're not going toJOINon a variable condition. YourJOINcriteria fortable3to whatever table you're joining to will always be the same, so I don't see how you need to dynamically create a join based on a variable.
– msturek
Nov 13 '18 at 15:25
You're not going to
JOIN on a variable condition. Your JOIN criteria for table3 to whatever table you're joining to will always be the same, so I don't see how you need to dynamically create a join based on a variable.– msturek
Nov 13 '18 at 15:25
You're not going to
JOIN on a variable condition. Your JOIN criteria for table3 to whatever table you're joining to will always be the same, so I don't see how you need to dynamically create a join based on a variable.– msturek
Nov 13 '18 at 15:25
add a comment |
1 Answer
1
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votes
It seems that I was looking for a CROSS JOIN
answered Nov 13 '18 at 15:31
user2827048user2827048
92114
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
It seems that I was looking for a CROSS JOIN
answered Nov 13 '18 at 15:31
user2827048user2827048
92114
add a comment |
It seems that I was looking for a CROSS JOIN
answered Nov 13 '18 at 15:31
user2827048user2827048
92114
add a comment |
It seems that I was looking for a CROSS JOIN
answered Nov 13 '18 at 15:31
user2827048user2827048
92114
It seems that I was looking for a CROSS JOIN
answered Nov 13 '18 at 15:31
user2827048user2827048
92114
answered Nov 13 '18 at 15:31
user2827048user2827048
92114
answered Nov 13 '18 at 15:31
user2827048user2827048
92114
answered Nov 13 '18 at 15:31
user2827048user2827048
92114
92114
add a comment |
add a comment |
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You're not going to
JOINon a variable condition. YourJOINcriteria fortable3to whatever table you're joining to will always be the same, so I don't see how you need to dynamically create a join based on a variable.– msturek
Nov 13 '18 at 15:25