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1. Database table structure optimization a. select the most applicable field attribute and index According to the actual situation: for example, limit the length of varchar field, set fixed length char; use enum. b. use connections instead of subqueries According to the actual situation: try not to use subquery if it can be rewritten as join.// ...

spring boot global exception handling Handling global exceptions requires three steps Custom exception enumeration Custom exception Sprboot AOP exception handling Below I write a relatively simple, hope to combine according to their own situation, here I simply write some code ideas. 1 Custom Same ...

Refer to the notes MySQL Stored Procedures and Function Creation and the official website on how MySQL creates and uses stored procedures: https://dev.mysql.com/doc/refman/5.7/en/create-procedure.html This main example uses stored procedures for input parameters and solves the problem of using table names as input parameters, since previously ...

Catalog: 1. What is a stored procedure Two. Six Stored Procedures 1. Stored procedures with input parameters 2. Stored procedures with output parameters 3. Stored procedures with input and output parameters 4. Stored Procedures with Conditional Judgement 5. Stored Procedures with Looping Procedures 6. Use the results of the query a ...

1. What is a stored procedure? Stored procedures and functions are sql statements that have been compiled and stored in the database beforehand. Calling stored procedures can simplify our development. The difference between stored procedures and functions is that functions have return values and stored procedures have no return values. 2. Gra ...

Java Web Development Knowledge Summary (Oracle-Programming) 1. PL/SQL: Oracle-specific 1.1 PL/SQL Overview PL/SQL (Procedure Language/SQL) is Oracle's procedural extension of SQL language. It refers to the addition of procedural statements (such as branches, loops, etc.) in the SQL command language, which makes the SQL language procedur ...

This article is from Li Mingzi's csdn blog( http://blog.csdn.net/free1985 For commercial reprints, please contact the blogger for authorization. For non-commercial reprints, please indicate the source. Abstract: this paper introduces the implementation of plsql-based code storage in the first root traversal tree with layer number. The code in ...

Everyone who has used mybatis knows that it is a project that was renamed after the acquisition of ibatis by Google, so it has also made a lot of upgrades. This article will introduce the difference between the two in calling stored procedures. ibatis has a special tag < procedure > which is no longer available in mybatis, but is distingu ...

Various constraints in SQL Server and methods of querying various constraints using sql are introduced in the paper. Based on the above, table structure is implemented in this paper. (Contains constraints) The storage process of replication. The stored procedure is tested on SQL Server 2008 and SQL Server 2014. sql is as follows /********* ...

background Developer feedback system is particularly slow to execute a stored procedure, which is checked because of the need to insert a large amount of data into the new task table during the execution of the stored procedure. The primary key of the task table is clustered index. Why does clustering index cause slow insertion? How much impa ...