@wenshao 你好，想跟你请教个问题：

我是在用activiti工作流的时候  初始化生成流程表产生了下面的问题

工作流引擎代码：

ProcessEngineConfiguration config = ProcessEngineConfiguration

.createStandaloneProcessEngineConfiguration();

config.setDataSource(dataSource).setDatabaseSchemaUpdate(ProcessEngineConfiguration.DB_SCHEMA_UPDATE_TRUE).buildProcessEngine();

报错信息：

Caused by: java.sql.SQLException: sql injection violation, syntax error: TODO UNIQUE unique: alter table ACT_RE_PROCDEF

add constraint ACT_UNIQ_PROCDEF

unique (KEY_,VERSION_, TENANT_ID_)

at com.alibaba.druid.wall.WallFilter.check(WallFilter.java:724)

at com.alibaba.druid.wall.WallFilter.statement_execute(WallFilter.java:396)

at com.alibaba.druid.filter.FilterChainImpl.statement_execute(FilterChainImpl.java:2487)

at com.alibaba.druid.filter.FilterAdapter.statement_execute(FilterAdapter.java:2451)

at com.alibaba.druid.filter.FilterEventAdapter.statement_execute(FilterEventAdapter.java:188)

at com.alibaba.druid.filter.FilterChainImpl.statement_execute(FilterChainImpl.java:2487)

at com.alibaba.druid.proxy.jdbc.StatementProxyImpl.execute(StatementProxyImpl.java:137)

at com.alibaba.druid.pool.DruidPooledStatement.execute(DruidPooledStatement.java:421)

at org.activiti.engine.impl.db.DbSqlSession.executeSchemaResource(DbSqlSession.java:1368)

... 32 more

Caused by: com.alibaba.druid.sql.parser.ParserException: TODO UNIQUE unique

at com.alibaba.druid.sql.dialect.mysql.parser.MySqlStatementParser.parseAlterTable(MySqlStatementParser.java:2375)

at com.alibaba.druid.sql.dialect.mysql.parser.MySqlStatementParser.parseAlter(MySqlStatementParser.java:2297)

at com.alibaba.druid.sql.parser.SQLStatementParser.parseStatementList(SQLStatementParser.java:217)

at com.alibaba.druid.sql.parser.SQLStatementParser.parseStatementList(SQLStatementParser.java:145)

at com.alibaba.druid.wall.WallProvider.checkInternal(WallProvider.java:620)

at com.alibaba.druid.wall.WallProvider.check(WallProvider.java:574)

at com.alibaba.druid.wall.WallFilter.check(WallFilter.java:711)

... 40 more

druid版本：1.0.15,1.0.21(测试了这两版本) mysql驱动版本：5.1.32

语句：

alter table ACT_RE_PROCDEF

add constraint ACT_UNIQ_PROCDEF

unique (KEY_,VERSION_, TENANT_ID_)

单独拿出来跑是没有问题的

另：我换了HikariCP 没有出现问题，是不是我对Druid的配置出现了问题