我想知道是否有一种方法可以在创建索引或在MySQL上销毁索引之前检查索引是否存在。几年前似乎有一个功能请求，但我找不到任何解决方案的文档。这需要在使用MDB2的PHP应用程序中完成。
这是我的4班轮：
set @exist := (select count(*) from information_schema.statistics where table_name = 'table' and index_name = 'index' and table_schema = database());
set @sqlstmt := if( @exist > 0, 'select ''INFO: Index already exists.''', 'create index i_index on tablename ( columnname )');
PREPARE stmt FROM @sqlstmt;
EXECUTE stmt;
IF EXISTS修饰符不是为DROP INDEX或CREATE INDEX构建的。但您可以在创建/删除索引之前手动检查是否存在。
使用此句来检查索引是否已存在。
SHOW INDEX FROM table_name WHERE KEY_NAME = 'index_name'
这是一个DROP INDEX IF EXISTS程序：
DELIMITER $$
DROP PROCEDURE IF EXISTS drop_index_if_exists $$
CREATE PROCEDURE drop_index_if_exists(in theTable varchar(128), in theIndexName varchar(128) )
BEGIN
IF((SELECT COUNT(*) AS index_exists FROM information_schema.statistics WHERE TABLE_SCHEMA = DATABASE() and table_name =
theTable AND index_name = theIndexName) > 0) THEN
SET @s = CONCAT('DROP INDEX ' , theIndexName , ' ON ' , theTable);
PREPARE stmt FROM @s;
EXECUTE stmt;
END IF;
END $$
DELIMITER ;
此代码是基于此处的过程创建的：Determining if MySQL table index exists before creating
我调整了这里找到的答案，以及在哪里提出以下用于删除和创建索引的sprocs。请注意，如果需要，AddTableIndex sproc可以删除索引。他们还接受一个对我的用途至关重要的模式名称。
DELIMITER //
DROP PROCEDURE IF EXISTS migrate.DropTableIndex //
CREATE PROCEDURE migrate.DropTableIndex
(
in schemaName varchar(128) -- If null use name of current schema;
, in tableName varchar(128) -- If null an exception will be thrown.
, in indexName varchar(128) -- If null an exception will be thrown.
)
BEGIN
SET schemaName = coalesce(schemaName, schema());
IF((SELECT COUNT(*) AS index_exists FROM information_schema.statistics WHERE TABLE_SCHEMA = schemaName and table_name = tableName AND index_name = indexName) > 0) THEN
SET @s = CONCAT('DROP INDEX `' , indexName , '` ON `' , schemaName, '`.`', tableName, '`');
PREPARE stmt FROM @s;
EXECUTE stmt;
END IF;
END //
DROP PROCEDURE IF EXISTS migrate.AddTableIndex//
CREATE PROCEDURE migrate.AddTableIndex
(
IN schemaName varchar(128) -- If null use name of current schema;
, IN tableName varchar(128) -- If null an exception will be thrown.
, IN indexName varchar(128) -- If null an exception will be thrown.
, IN indexDefinition varchar(1024) -- E.g. '(expireTS_ ASC)'
, IN ifPresent ENUM('leaveUnchanged', 'dropAndReplace') -- null=leaveUnchanged.
, OUT outcome tinyint(1) -- 0=unchanged, 1=replaced, 4=added.
)
BEGIN
DECLARE doDrop tinyint(1) DEFAULT NULL;
DECLARE doAdd tinyint(1) DEFAULT NULL;
DECLARE tmpSql varchar(4096) DEFAULT '';
SET schemaName = coalesce(schemaName, schema());
SET ifPresent = coalesce(ifPresent, 'leaveUnchanged');
IF EXISTS (SELECT * FROM INFORMATION_SCHEMA.STATISTICS WHERE table_schema = schemaName AND table_name = tableName AND index_name = indexName) THEN
IF (ifPresent = 'leaveUnchanged') THEN
SET doDrop = 0;
SET doAdd = 0;
SET outcome = 0;
ELSEIF (ifPresent = 'dropAndReplace')
THEN
SET doDrop = 1;
SET doAdd = 1;
SET outcome = 1;
END IF;
ELSE
SET doDrop = 0;
SET doAdd = 1;
SET outcome = 4;
END IF;
IF (doDrop = 1) THEN
SET tmpSql = concat( 'alter table `', schemaName, '`.`', tableName, '` drop index `', indexName, '` ');
SET @sql = tmpSql;
PREPARE tmp_stmt FROM @sql;
EXECUTE tmp_stmt;
DEALLOCATE PREPARE tmp_stmt;
END IF;
IF (doAdd = 1) THEN
SET tmpSql = concat( 'alter table `', schemaName, '`.`', tableName, '` add index `', indexName, '` (', indexDefinition, ')');
SET @sql = tmpSql;
PREPARE tmp_stmt FROM @sql;
EXECUTE tmp_stmt;
DEALLOCATE PREPARE tmp_stmt;
END IF;
END;
//
DELIMITER ;
我在MySQL中使用SELECT IF（）语句有类似的东西。
select if (
exists(
select distinct index_name from information_schema.statistics
where table_schema = 'schema_db_name'
and table_name = 'tab_name' and index_name like 'index_1'
)
,'select ''index index_1 exists'' _______;'
,'create index index_1 on tab_name(column_name_names)') into @a;
PREPARE stmt1 FROM @a;
EXECUTE stmt1;
DEALLOCATE PREPARE stmt1;
使用if（）语句的优点是它不需要编写任何过程。
MySQL Workbench 6.3版（MySql fork MariaDb）
DROP INDEX IF EXISTS FK_customer__client_school__school_id ON dbname.tablename;
我在这里提出的一些解决方案存在问题。这就是我想出的：
DELIMITER $$
DROP PROCEDURE IF EXISTS myschema.create_index_if_not_exists $$
CREATE PROCEDURE myschema.create_index_if_not_exists(in p_tableName VARCHAR(128), in p_indexName VARCHAR(128), in p_columnName VARCHAR(128) )
BEGIN
PREPARE stmt FROM 'SELECT @indexCount := COUNT(1) from information_schema.statistics WHERE `table_name` = ? AND `index_name` = ?';
SET @table_name = p_tableName;
SET @index_name = p_indexName;
EXECUTE stmt USING @table_name, @index_name;
DEALLOCATE PREPARE stmt;
-- select @indexCount;
IF( @indexCount = 0 ) THEN
SELECT 'Creating index';
SET @createIndexStmt = CONCAT('CREATE INDEX ', p_indexName, ' ON ', p_tableName, ' ( ', p_columnName ,')');
PREPARE stmt FROM @createIndexStmt;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
END IF;
END $$
DELIMITER ;
使用方法如下：
call myschema.create_index_if_not_exists('MyTable','end_time_index','end_time');
这是在使用MySQL 5.5.24的MAC OS X 10.8.2和使用MySQL 5.5.21的Windows 7上测试的
我认为这对您放弃现有索引很有帮助。
DELIMITER //
CREATE PROCEDURE dropIndexing
()
BEGIN
IF EXISTS(
SELECT * FROM information_schema.statistics
WHERE TABLE_SCHEMA = DATABASE()
AND `table_name`='mytable'
AND `index_name` = 'myindex'
)
THEN
ALTER TABLE `mytable` DROP INDEX `myindex`;
END IF;
END //
DELIMITER ;
CALL dropIndexing();
DROP PROCEDURE dropIndexing;
这是DROP INDEX IF EXISTS的一种解决方法，在v10.1.4之前的MySQL和MariaDB版本中缺少这种解决方法。您也可以将它用于您想要的每个其他语句，这应该取决于INDEX的存在（例如，对于SELECT "info: index exists."，如下例所示）。
-- DROP INDEX IF EXISTS
SELECT
COUNT(*)
INTO
@INDEX_my_index_ON_TABLE_my_table_EXISTS
FROM
`information_schema`.`statistics`
WHERE
`table_schema` = 'my_database'
AND `index_name` = 'my_index'
AND `table_name` = 'my_table'
;
SET @statement := IF(
@INDEX_my_index_ON_TABLE_my_table_EXISTS > 0,
-- 'SELECT "info: index exists."',
'DROP INDEX `my_index` ON `my_table`',
'SELECT "info: index does not exist."'
);
PREPARE statement FROM @statement;
EXECUTE statement;