这将在database/migrations目录下创建一个新的迁移文件,文件名类似2022_01_01_000000_modify_column_in_table.php。 接下来,在新生成的迁移文件中,可以使用table方法来指定要修改的表,然后使用change方法来修改列。具体的修改操作可以通过-><修改类型>('column_name')来完成。例如,如果要将表中的name列修改为varch...
$table->string('name',50)->change(); }); 我们也能将字段修改为 nullable: Schema::table('users',function(Blueprint$table){ $table->string('name',50)->nullable()->change(); }); 备注 下面的字段类型不能被「修改」: char,double,enum,mediumInteger,timestamp,tinyInteger,ipAddress,json,json...
Specifying A Custom Column Name1'state' => 'exists:states,abbreviation'Occasionally, you may need to specify a specific database connection to be used for the exists query. You can accomplish this by prepending the connection name to the table name using "dot" syntax:1'email' => 'exists:...
Thechangemethod allows you to modify an existing column to a new type, or modify the column's attributes. For example, you may wish to increase the size of a string column. To see thechangemethod in action, let's increase the size of thenamecolumn from 25 to 50: change 方法允许你改变...
13 public function getRememberTokenName(); 14}This interface is simple. The getAuthIdentifierName method should return the name of the "primary key" column for the user and the getAuthIdentifier method should return the "primary key" of the user. When using a MySQL back-end, this would li...
$table->dropColumn('description'); }); } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 修改字段: public function up() { Schema::table('articles', function (Blueprint $table) { $table->string('description', 200)->change(); ...
1Schema::table('users', function (Blueprint $table) {2$table->string('name', 50)->nullable()->change();3}); 然后,运行 1php artisan migrate 即可生效 修改字段名 1Schema::table('users', function (Blueprint $table) {2$table->renameColumn('from', 'to');//from字段改名为to字段3})...
为了消除使用change()修改列时对doctrine/dbal包的需求, Laravel 10将有一个新功能。这个功能将允许开发人员使用change()方法和修改MySQL, PostgreSQL, 和SQL Server上的列,而不需要额外的包。这是一个重大的和有风险的突破性变化,但我们相信这是值得的, 因为它将消除对额外包的需求. ...
if(Schema::hasColumn("test","password")){// 将password类型修改为text$table->text('password')->change();} 4> 删除字段 if(Schema::hasCloumn("test","gender")){Schema::table("test",function($table){$table->dropColumn("gender");});} ...
4、报错:Illuminate\Database\QueryException : SQLSTATE[42S21]: Column already exists: 1060 Duplicate column name ‘step’ 。如图2 图2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Illuminate\Database\QueryException : SQLSTATE[42S21]: Column already exists: 1060 ...