From a0d02bfb09a02277b819ec2db042f697c66503ed Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E9=AB=98=E9=93=81?= Date: Tue, 3 Oct 2017 22:56:03 -0500 Subject: [PATCH] Updated SQL_Schema_Repository (markdown) --- SQL_Schema_Repository.md | 93 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 91 insertions(+), 2 deletions(-) diff --git a/SQL_Schema_Repository.md b/SQL_Schema_Repository.md index e6e93b9..b8bee61 100644 --- a/SQL_Schema_Repository.md +++ b/SQL_Schema_Repository.md @@ -1,2 +1,91 @@ -# 简介 -Druid SQL Parser内置了一个SchemaRepository，在内存中缓存SQL Schema信息，用于SQL语义解析中的ColumnResolve等操作。 \ No newline at end of file +# 1. 简介 +Druid SQL Parser内置了一个SchemaRepository，在内存中缓存SQL Schema信息，用于SQL语义解析中的ColumnResolve等操作。 + +# 2. 如何使用SchemaRepository +```java +import com.alibaba.druid.sql.repository.SchemaRepository; + +SchemaRepository repository = new SchemaRepository(JdbcConstants.MYSQL); + +repository.console("use sc00;"); + +String sql = "CREATE TABLE `test1` (\n" + + " `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'id',\n" + + " `c_tinyint` tinyint(4) DEFAULT '1' COMMENT 'tinyint',\n" + + " `c_smallint` smallint(6) DEFAULT 0 COMMENT 'smallint',\n" + + " `c_mediumint` mediumint(9) DEFAULT NULL COMMENT 'mediumint',\n" + + " `c_int` int(11) DEFAULT NULL COMMENT 'int',\n" + + " `c_bigint` bigint(20) DEFAULT NULL COMMENT 'bigint',\n" + + " `c_decimal` decimal(10,3) DEFAULT NULL COMMENT 'decimal',\n" + + " `c_date` date DEFAULT '0000-00-00' COMMENT 'date',\n" + + " `c_datetime` datetime DEFAULT '0000-00-00 00:00:00' COMMENT 'datetime',\n" + + " `c_timestamp` timestamp NULL DEFAULT NULL COMMENT 'timestamp' ON UPDATE CURRENT_TIMESTAMP ,\n" + + " `c_time` time DEFAULT NULL COMMENT 'time',\n" + + " `c_char` char(10) DEFAULT NULL COMMENT 'char',\n" + + " `c_varchar` varchar(10) DEFAULT 'hello' COMMENT 'varchar',\n" + + " `c_blob` blob COMMENT 'blob',\n" + + " `c_text` text COMMENT 'text',\n" + + " `c_mediumtext` mediumtext COMMENT 'mediumtext',\n" + + " `c_longblob` longblob COMMENT 'longblob',\n" + + " PRIMARY KEY (`id`,`c_tinyint`),\n" + + " UNIQUE KEY `uk_a` (`c_varchar`,`c_mediumint`),\n" + + " KEY `k_c` (`c_tinyint`,`c_int`),\n" + + " KEY `k_d` (`c_char`,`c_bigint`)\n" + + ") ENGINE=InnoDB AUTO_INCREMENT=1769503 DEFAULT CHARSET=utf8mb4 COMMENT='10000000'"; + + +repository.console(sql); + +MySqlCreateTableStatement createTableStmt = (MySqlCreateTableStatement) repository.findTable("test1").getStatement(); +assertEquals(21, createTableStmt.getTableElementList().size()); + +//StringBuilder buf = new StringBuilder(); +//createTableStmt.showCoumns(buf); + +assertEquals("+--------------+---------------+------+-----+---------------------+-----------------------------+\n" + + "| Field | Type | Null | Key | Default | Extra |\n" + + "+--------------+---------------+------+-----+---------------------+-----------------------------+\n" + + "| id | bigint(20) | NO | PRI | NULL | auto_increment |\n" + + "| c_tinyint | tinyint(4) | YES | PRI | 1 | |\n" + + "| c_smallint | smallint(6) | YES | | 0 | |\n" + + "| c_mediumint | mediumint(9) | YES | | NULL | |\n" + + "| c_int | int(11) | YES | | NULL | |\n" + + "| c_bigint | bigint(20) | YES | | NULL | |\n" + + "| c_decimal | decimal(10,3) | YES | | NULL | |\n" + + "| c_date | date | YES | | 0000-00-00 | |\n" + + "| c_datetime | datetime | YES | | 0000-00-00 00:00:00 | |\n" + + "| c_timestamp | timestamp | YES | | NULL | on update CURRENT_TIMESTAMP |\n" + + "| c_time | time | YES | | NULL | |\n" + + "| c_char | char(10) | YES | MUL | NULL | |\n" + + "| c_varchar | varchar(10) | YES | MUL | hello | |\n" + + "| c_blob | blob | YES | | NULL | |\n" + + "| c_text | text | YES | | NULL | |\n" + + "| c_mediumtext | mediumtext | YES | | NULL | |\n" + + "| c_longblob | longblob | YES | | NULL | |\n" + + "+--------------+---------------+------+-----+---------------------+-----------------------------+\n", repository.console("show columns from test1")); + +repository.console("alter table test1 drop column c_decimal;"); +assertEquals(20, createTableStmt.getTableElementList().size()); + +assertEquals("+--------------+--------------+------+-----+---------------------+-----------------------------+\n" + + "| Field | Type | Null | Key | Default | Extra |\n" + + "+--------------+--------------+------+-----+---------------------+-----------------------------+\n" + + "| id | bigint(20) | NO | PRI | NULL | auto_increment |\n" + + "| c_tinyint | tinyint(4) | YES | PRI | 1 | |\n" + + "| c_smallint | smallint(6) | YES | | 0 | |\n" + + "| c_mediumint | mediumint(9) | YES | | NULL | |\n" + + "| c_int | int(11) | YES | | NULL | |\n" + + "| c_bigint | bigint(20) | YES | | NULL | |\n" + + "| c_date | date | YES | | 0000-00-00 | |\n" + + "| c_datetime | datetime | YES | | 0000-00-00 00:00:00 | |\n" + + "| c_timestamp | timestamp | YES | | NULL | on update CURRENT_TIMESTAMP |\n" + + "| c_time | time | YES | | NULL | |\n" + + "| c_char | char(10) | YES | MUL | NULL | |\n" + + "| c_varchar | varchar(10) | YES | MUL | hello | |\n" + + "| c_blob | blob | YES | | NULL | |\n" + + "| c_text | text | YES | | NULL | |\n" + + "| c_mediumtext | mediumtext | YES | | NULL | |\n" + + "| c_longblob | longblob | YES | | NULL | |\n" + + "+--------------+--------------+------+-----+---------------------+-----------------------------+\n", repository.console("show columns from test1")); + +``` \ No newline at end of file