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Druid数据库连接池的特点 稳定 高效率 可扩展 可监控 可动态配置 防SQL注入

稳定 阿里巴巴大规模部署 我们大规模使用中，开源连接池只有两个是稳定的： 应用超过500个 部署实例超过3000 最大集群超过60台 Druid DataSource Jboss DataSource （历史原因还在使用）

稳定的特性-ExceptionSorter 当连接产生不可恢复的异常时，需要及时从连接池中清除，否则会产生大量错误。这个功能也称为ExceptionSorter，只有JBossDataSource和DruidDataSource实现了这个功能。

Oracle Fatal Excetion Error Code 28 Session has been killed 600 Internal oracle error 1012 Not logged on 1014 Oracle shutdown in progress 1033 Oracle initialization or shutdown in progress 1034 Oracle not available 1035 ORACLE only available to users with RESTRICTED SESSION privilege 1089 Immediate shutdown in progres – no operations are permitted 1090 Shutdown in progress – no operations are permitted 1092 ORACLE instance terminated. Disconnection forced 1094 ALTER DATABASE CLOSE in progress. Connections not permitted …

MySql Fatal Exception Error Code 1040 ER_CON_COUNT_EEROR 1042 ER_BAD_HOST_ERRROR 1043 ER_HANDSHAKE_ERROR 1047 ER_UNKOWN_COM_ERROR 1081 ER_IPSOCK_ERROR 1029 ER_HOST_IS_BLOCKED 1030 ER_HOST_NOT_PRIVILEGED 1045 ER_ACCESS_DENIED_ERROR 1004 ER_CANT_CREATE_FILE 1005 ER_CANT_CREAT_TABLE 1015 ER_CANT_LOCK 1021 ER_DISK_FULL …

高性能 Druid是目前性能最好的数据库连接池 1 线程 2 线程 5 线程 10 线程 20线程 50线程 Druid 1,102 1,509 1,889 1,904 2,007 1,977 Tomcat-jdbc 1,399 1,378 2,257 2,289 2,305 2,503 DBCP 3,144 3,834 6,276 6,408 6,563 6,783 BoneCP 4,327 3,598 3,800 5,242 9,402 19,066 Jboss-Datasource 4,912 3,049 6,868 6,512 40,146 43,748 C3P0 18,570 19,467 15,270 19,294 28,195 66,677 Proxool 16,221 14,455 24,688 38,905 48,087 (Error) 58,238 详细测试信息： https://github.com/alibaba/druid/wiki/%E5%90%84%E7%A7%8D%E8%BF%9E%E6%8E%A5%E6%B1%A0%E6%80%A7%E8%83%BD%E5%AF%B9%E6%AF%94%E6%B5%8B%E8%AF%95 Druid是目前性能最好的数据库连接池

SQL Parser Parser基本概念 词法分析 Token 语法分析 抽象语法树 表达式 语句

手写Parser的性能 Cobar的SQL Parser，从Antlr生成的parser修改为Druid Parser之后，大约提升6倍的性能。 Druid Parser最近再次大幅度提升性能(50%) SQL Parser的关键在于词法 词法分析要支持预测

监控

Spring关联监控

Web关联监控

查看SQL执行明细 配置filters=log4j 2013-07-12 16:10:17,966 [DEBUG] Connection:132 - {conn-10001} connected 2013-07-12 16:10:17,970 [DEBUG] Connection:132 - {conn-10001} commited 2013-07-12 16:10:17,970 [DEBUG] Connection:132 - {conn 10001} rollback 2013-07-12 16:10:17,983 [DEBUG] Statement:137 - {conn-10001, stmt-20000} created 2013-07-12 16:10:17,986 [DEBUG] Statement:137 - {conn-10001, stmt-20000} executed. 0.052501 millis. SELECT 1 2013-07-12 16:10:17,986 [DEBUG] Statement:137 - {conn-10001, stmt-20000} batch executed. 0.041842 millis. SELECT 1 2013-07-12 16:10:18,205 [DEBUG] Statement:137 - {conn-10001, stmt-20000, rs-50000} query executed. 219.082247 millis. SELECT 1 2013-07-12 16:10:18,205 [DEBUG] ResultSet:142 - {conn-10001, stmt-20000, rs-50000} open 2013-07-12 16:10:18,206 [DEBUG] ResultSet:142 - {conn-10001, stmt-20000, rs-50000} Header: [null] 2013-07-12 16:10:18,206 [DEBUG] Statement:137 - {conn-10001, stmt-20000} update executed. effort 0. 0.019343 millis. SELECT 1 2013-07-12 16:10:18,223 [DEBUG] Statement:137 - {conn-10001, pstmt-20001} created. SELECT 1 2013-07-12 16:10:18,260 [DEBUG] Statement:137 - {conn-10001, pstmt-20001} Parameters : [null, null, null, null, com.alibaba.druid.mock.MockBlob@34aee875, 1, [B@471f7458, null, com.alibaba.druid.mock.MockClob@620f61e2, null, 1.0, 1, 1, null, com.alibaba.druid.mock.MockNClob@5fe36eb9, null, null, null, com.alibaba.druid.mock.MockRef@4c7a64dd, com.alibaba.druid.mock.MockRowId@77741064, 1, com.alibaba.druid.mock.MockSQLXML@64e05280, , null, null, null, null] 2013-07-12 16:10:18,260 [DEBUG] Statement:137 - {conn-10001, pstmt-20001} Types : [ARRAY, OTHER, DECIMAL, OTHER, BLOB, TINYINT, OTHER, OTHER, CLOB, DATE, FLOAT, INTEGER, BIGINT, OTHER, NCLOB, NVARCHAR, VARCHAR, OTHER, REF, ROWID, SMALLINT, SQLXML, VARCHAR, TIME, TIMESTAMP, OTHER, OTHER] 2013-07-12 16:10:18,260 [DEBUG] Statement:137 - {conn-10001, pstmt-20001} executed. 0.564872 millis. SELECT 1 2013-07-12 16:10:18,260 [DEBUG] Statement:137 - {conn-10001, pstmt-20001} batch executed. 0.0075 millis. SELECT 1 2013-07-12 16:10:18,262 [DEBUG] Statement:137 - {conn-10001, pstmt-20001} Types : [ARRAY, OTHER, DECIMAL, OTHER, BLOB, TINYINT, OTHER, OTHER, CLOB, DATE, FLOAT, INTEGER, BIGINT, OTHER, NCLOB, NVARCHAR, VARCHAR, OTHER, REF, ROWID, SMALLINT, SQLXML, VARCHAR, TIME, TIMESTAMP, OTHER, OTHER] 2013-07-12 16:10:18,262 [DEBUG] Statement:137 - {conn-10001, pstmt-20001, rs-50001} query executed. 1.805932 millis. SELECT 1 2013-07-12 16:10:18,262 [DEBUG] ResultSet:142 - {conn-10001, pstmt-20001, rs-50001} open 2013-07-12 16:10:18,263 [DEBUG] ResultSet:142 - {conn-10001, pstmt-20001, rs-50001} Header: [null] 2013-07-12 16:10:18,263 [DEBUG] Statement:137 - {conn-10001, pstmt-20001} Parameters : [null, null, null, null, com.alibaba.druid.mock.MockBlob@34aee875, 1, [B@471f7458, null, com.alibaba.druid.mock.MockClob@620f61e2, null, 1.0, 1, 1, null, com.alibaba.druid.mock.MockNClob@5fe36eb9, null, null, null, com.alibaba.druid.mock.MockRef@4c7a64dd, com.alibaba.druid.mock.MockRowId@77741064, 1, com.alibaba.druid.mock.MockSQLXML@64e05280, , null, null, null, null] 2013-07-12 16:10:18,263 [DEBUG] Statement:137 - {conn-10001, pstmt-20001} Types : [ARRAY, OTHER, DECIMAL, OTHER, BLOB, TINYINT, OTHER, OTHER, CLOB, DATE, FLOAT, INTEGER, BIGINT, OTHER, NCLOB, NVARCHAR, VARCHAR, OTHER, REF, ROWID, SMALLINT, SQLXML, VARCHAR, TIME, TIMESTAMP, OTHER, OTHER] 2013-07-12 16:10:18,263 [DEBUG] Statement:137 - {conn-10001, pstmt-20001} update executed. effort 0. 0.287765 millis. SELECT 1 2013-07-12 16:10:18,274 [DEBUG] Statement:137 - {conn-10001, cstmt-20002} created. SELECT 1 2013-07-12 16:10:18,274 [DEBUG] Statement:137 - {conn-10001, stmt-20000, rs-50002} query executed. 0.081711 millis. SELECT 1 2013-07-12 16:10:18,274 [DEBUG] ResultSet:142 - {conn-10001, stmt-20000, rs-50002} open 2013-07-12 16:10:18,274 [DEBUG] ResultSet:142 - {conn-10001, stmt-20000, rs-50002} Header: [null] 2013-07-12 16:10:18,275 [DEBUG] ResultSet:142 - {conn-10001, stmt-20000, rs-50002} Result: [1]

防御SQL注入 配置filters=“wall” 智能拦截永真条件 智能拦截系统函数调用 智能拦截系统表访问

集中配置、动态配置 filters=“config” 支持数据库密码加密 支持从本地或者http远程读取配置文件