http://www.tutorialspoint.com/mybatis/mybatis_dynamic_
sql .htm Copyright © tutorialspoint.com MYBATIS - DYNAMIC
SQL MYBATIS - DYNAMIC
SQL Dynamic
SQL is a very powerful feature of MyBatis. It enables programmers write the query using the dynamic
SQL . MyBatis uses a powerful Dynamic
SQL language that can be used within any mapped
SQL statement. Following are the OGNL based Dynamic
SQL expressions provided by MyBatis when, otherwise trim where, set foreach The if Statement The most common thing to do in dynamic
SQL is conditionally include a part of a where clause. For example −
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C++20 ❤ SQL
John R Bandela, MDOverview
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SQL
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C++ Example
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Implementation techniques
u fixed_string
u meta_struct
u Parsing compile time strings into meta_structsOverview
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SQL
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C++ Example {price_from_user};Avoiding SQL Injection Attacks
SELECT orders.id, name, item, price, discount_code
FROM orders JOIN customers ON customers.id = customerid
WHERE price > ?;SQL Library Options
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Traditional Lots of information available
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Vulnerable to sql injection of developer not careful
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Use dynamic typingDomain Specific Language
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Use types to encode SQL
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Looks more like regular C++
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Typically requires
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PCB Editor The KiCad Team . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table of Contents Introduction to the KiCad PCB Editor Initial configuration The PCB Editor user interface Navigating the editing canvas Hotkeys Display and selection variables Custom design rules Scripting Working With IDF Component Outlines Actions reference PCB Editor 3D Viewer Common 64 67 68 69 70 71 73 73 75 76 76 81 82 98 100 109 109 120 122
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PCB Editor The KiCad Team . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Customization Custom design rules Scripting Working With IDF Component Outlines Actions reference PCB Editor 3D Viewer Common 52 55 56 57 58 59 61 61 63 64 64 69 81 82 92 92 102 104 1 not have hotkeys assigned by default, but hotkeys can be assigned or redefined using the hotkey editor (Preferences → Preferences… → Hotkeys). NOTE Many of the actions available through hotkeys are
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 Pcbnew vii 8.3.2 Netclass editor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 8.3 Footprint Editor - Managing Libraries 112 12.1 Overview of Footprint Editor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112 12.2 Accessing Footprint Editor . . . . . . . . 113 12.3 Footprint Editor user interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 12.4 Top toolbar in Footprint Editor . . . . . . . . . . . . . .
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 8.3.2 Netclass editor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 Footprint Editor - Managing Libraries 104 12.1 Overview of Footprint Editor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 12.2 Accessing Footprint Editor . . . . 105 12.3 Footprint Editor user interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 12.4 Top toolbar in Footprint Editor . . . . . . . . . . . .
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Pl_Editor Pl_Editor ii October 31, 2021 Pl_Editor iii Contents 1 Introduction to Pl_Editor 2 2 Pl_Editor files 2 2.1 Input file and default title block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6 Invoking Pl_Editor 14 7 Pl_Editor Commands 14 7.1 Main Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 8 Left window 17 Pl_Editor iv 9 Right window 18 10 Interactive edition 20 10.1 Item selection . . . . . . . . . . . . .
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. . . . . . . . . . . . . . . . . . . . . . 19 Eeschema iv 3.2.4 Preferences menu / Schematic Editor Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 3.2.5 Preferences and . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4.2 Options of the schematic editor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.2.1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 Eeschema vii 11 Component Library Editor 79 11.1 General Information About Component Libraries . . . . . . . . . . . . . . . . . . . . .
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Pl_Editor Pl_Editor ii October 31, 2021 Pl_Editor iii Contents 1 Introduction to Pl_Editor 2 2 Pl_Editor files 2 2.1 Input file and default title block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6 Invoking Pl_Editor 14 7 Pl_Editor Commands 14 7.1 Main Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 8 Left window 18 Pl_Editor iv 9 Right window 19 10 Interactive edition 21 10.1 Item selection . . . . . . . . . . . . .
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The SQL HandbookThe SQL Handbook Conclusion 2 Preface The SQL Handbook follows the 80/20 rule: learn in 20% of the time the 80% of a topic. In particular, the goal is to get you up to speed quickly with SQL. This Enjoy! 3 The SQL Handbook 1. Information systems, data and information 2. What is a Database? And a DBMS? 3. Do you always need a database? 4. Relational Databases 5. Introduction to SQL 6. Creating data 20. Limit and offset 21. Comments The goal of this handbook is to get you up and running with SQL, starting from zero knowledge. You will learn the terms and the main ideas, what is a DBMS, how to0 码力 | 26 页 | 440.71 KB | 1 年前3