'Host language embedded sql' presentation slideshows

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Chapter 7: Constraints and Triggers

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Chapter 7: Constraints and Triggers

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Lecture 07: SQL Constraints and Programming

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End of SQL: Triggers, Impedance Mismatch and Transactions

End of SQL: Triggers, Impedance Mismatch and Transactions. February 6 th , 2004. Triggers. Enable the database programmer to specify: when to check a constraint, what exactly to do. A trigger has 3 parts: An event (e.g., update to an attribute)

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C20.0046: Database Management Systems Lecture #19

C20.0046: Database Management Systems Lecture #19. Matthew P. Johnson Stern School of Business, NYU Spring, 2004. Agenda. Previously: JDBC Next: Project part 3 due now Project part 4 due next week Scripting for SQL SPs Scripting for SQL on the web CGI/Perl PHP Security. Recap: JDBC.

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Lecture 05: SQL Systems Aspects

Lecture 05: SQL Systems Aspects. Friday, October 11, 2002. Outline. Embedded SQL (8.1) Transactions in SQL (8.6). Embedded SQL. direct SQL (= ad-hoc SQL) is rarely used in practice: SQL is embedded in some application code SQL code is identified by special syntax. Impedance Mismatch.

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Combining SQL and Conventional Programming Languages

Combining SQL and Conventional Programming Languages. Source: slides by Jeffrey Ullman. Shortcomings of SQL. Relational data model doesn't match well with data model of conventional programming languages (e.g., data structure mismatch) No pointers, loops or branches in SQL

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Programs with SQL

Programs with SQL. Host language + Embedded SQL. Preprocessor. Preprocessor. Host Language + function calls. Host language compiler. Host language compiler. Host language program. The Impedance Mismatch Problem. The host language manipulates variables, values, pointers

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Programs with SQL

Programs with SQL. Host language + Embedded SQL. Preprocessor. Preprocessor. Host Language + function calls. Host language compiler. Host language compiler. Host language program. The Impedance Mismatch Problem. The host language manipulates variables, values, pointers

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Constraining Attribute Values

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Different Constraint Types

Different Constraint Types. Type Where Declared When activated Guaranteed to hold? Attribute with attribute on insertion not if

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