Keep Query Values Separate from Query Structure
Bind the supplied input as a data parameter and keep allowed query structure fixed.
About 22 minutes, plus any extended practice
Supplied materials
- Paper and pencil; answers may also be spoken or typed.
- All cases, labels, numbers and rules are supplied on this page. No real account, private information or purchase is needed.
Learn the idea
Parameterized database queries bind data values separately from SQL structure. Concatenating an untrusted value into SQL text can let it be interpreted as part of the command. A parameter is a value, not a table or column name. This lesson compares safe paper plans without executing untrusted requests.
Bind the supplied input as a data parameter and keep allowed query structure fixed. Escaping by guesswork is not a substitute for documented parameter binding.
Use this supplied case: User value is passed through a placeholder binding. Which query-plan property is described? The task is to connect the given information to the computing idea. Write a short evidence trail so another learner can reproduce your choice. The simplified case describes the stated model, not every real system.
- Represent the supplied worked case with a labeled drawing, table or short trace.
- Bind the supplied input as a data parameter and keep allowed query structure fixed.
- Explain why the worked answer fits and why one alternative does not.
- Try the new check and practice cases; revisit the stated rule if your evidence does not match.
See the method in action
User value is passed through a placeholder binding. Which query-plan property is described? The supported answer is Bound data parameter. Bind the supplied input as a data parameter and keep allowed query structure fixed. Escaping by guesswork is not a substitute for documented parameter binding. The supplied facts, rather than an assumed real-world detail, determine this paper case. Compare the recorded action or value with the stated rule before choosing an answer.
Check your reasoning
Your answer is temporary and is not saved to an account. Download your current answer before leaving or reloading. Written work on paper or in another app stays in your own file.
Helpful tips
- Bind the supplied input as a data parameter and keep allowed query structure fixed.
- Escaping by guesswork is not a substitute for documented parameter binding.
See the answer and explanation
Unsafe string concatenation
The supplied case states: User value is pasted into SQL command text. Which query-plan property is described? Under the stated distinction, this identifies Unsafe string concatenation. Parameterized database queries bind data values separately from SQL structure. Concatenating an untrusted value into SQL text can let it be interpreted as part of the command. A parameter is a value, not a table or column name. This lesson compares safe paper plans without executing untrusted requests. Bind the supplied input as a data parameter and keep allowed query structure fixed.
Take it further
Bind a search value separately from SQL structure. A user-chosen column name is not a value parameter; validate it against an allowed identifier list.
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More practice: try new cases
Choose an answer for each problem. Explain your method on paper, then use the feedback to decide what to revisit.
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Check the subject sources
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