mysql set case

MySQL is a widely used open source database management system that runs on a variety of operating systems and is extremely flexible. In MySQL, case is a very important concept, because MySQL handles case differently in different situations. Therefore, it is necessary for people who use MySQL to understand how to set the case of MySQL.

MySQL's case settings are divided into two aspects. On the one hand are the global case settings for the MySQL server, and on the other hand are the case settings for the MySQL database or table. In this article, we will introduce the setting methods and precautions in these two aspects in detail.

Global case settings of MySQL server

In the global case settings of MySQL server, there are two important parameters that need to be set, namely lower_case_table_names and sql_mode. These two parameters respectively determine how MySQL handles the case of database and table names and MySQL's tolerance for the case of SQL statements.

lower_case_table_names parameter is used to set the case processing method of MySQL for database and table names. Specifically, when this parameter is set to 0, MySQL is case-sensitive to database and table names; when this parameter is set to 1, MySQL is not case-sensitive to database and table names; when this parameter is set to 2, MySQL Database names are not case-sensitive, but table names are case-sensitive. Obviously, setting the lower_case_table_names parameter to 1 enables MySQL to make table names case-insensitive, which helps improve the flexibility of MySQL database operations.

The sql_mode parameter is used to set MySQL's tolerance for the case of SQL statements. Specifically, when this parameter is set to STRICT_TRANS_TABLES, MySQL is case-sensitive for SQL statements. When this parameter is set to other values, MySQL is not case-sensitive for SQL statements. Therefore, setting the sql_mode parameter to a non-STRICT_TRANS_TABLES value can make MySQL case-insensitive to SQL statements, which can improve the convenience of MySQL operations.

Regarding the setting of these two parameters, we need to pay attention to the following points:

1. In Linux and UNIX operating systems, the lower_case_table_names parameter must be set before the MySQL server is started. Otherwise, the setting will have no effect and MySQL will not start. In Windows operating systems, this setting can be set in the my.ini or my.cnf configuration file in the MySQL installation directory.
2. When the MySQL version is upgraded, the values ​​of the lower_case_table_names and sql_mode parameters will change. Therefore, when upgrading the MySQL version, we need to understand the changes in MySQL parameters in a timely manner to ensure the normal operation of MySQL.

The case setting of MySQL database or table

The case setting of MySQL database or table mainly involves the naming convention of database and table names. Generally speaking, MySQL database and table names should not use mixed case naming. Otherwise, problems such as query errors caused by inconsistent case names of database or table names may easily occur. In order to standardize the naming method of MySQL database and table names, it is recommended to follow the following specifications:

1. Uniformly use lowercase letters for naming

MySQL database and table names should be named with lowercase letters Naming, avoid mixed case naming. This can avoid query errors caused by case differences when querying.

2. Uniformly use underscores to separate words

In MySQL database and table names, it is recommended to use underscores to separate words. For example, my_database and user_table are standard naming methods. This helps improve the readability and maintainability of MySQL database and table names.

3. Choose appropriate names for database and table names

When naming MySQL databases and tables, you should choose concise and meaningful names. At the same time, to avoid name conflicts and ambiguities, database and table names should be unique. Understanding the MySQL database and table naming conventions can improve the manageability and maintainability of the database.

Summary

MySQL case settings have an important impact on MySQL database operations. When setting the case of MySQL, you need to understand the global case settings of the MySQL server and the naming convention of the MySQL database or table. Choosing different case setting methods according to different situations can improve the flexibility and maintainability of MySQL database operations.

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