使用 P6Spy 来格式化 SQL 语句，支持 Hibernate 和 iBATIS

事情起因

在处理一个查询小功能的时候，自认为 SQL 语句和传参均正确，然而查询结果无匹配数据，在查看 Hibernate 自带 SQL 语句输出的时候带着问好感觉有点不爽，特别是想复制 SQL 语句到数据库客户端去调试时，还要手动复制参数值，麻烦得很。

所以我希望能做到输出 SQL 语句的时候能够把相关的参数值填在对应的位置，假如我需要复制到数据库客户端进行测试，也很方便。

说干就干，开始查找资料，了解到 Hibernate 自带的输出功能是无法实现我的需求，同时也轻易地看到了 P6Spy，这想想起来，以前处理的一个项目中，曾经用过 P6Spy，由于不是我架构的，当时我不太理解 P6Spy 的作用，只知道有个 spy.properties 文件很熟悉。非工科出身的程序员就是这样不够系统化。

接下来记录我自己的处理步骤，以及相关参考的文章。

一、引入依赖

所看到很多资料都提到去官网下载 jar 文件，但官网其实已经用不了，现在是放在 GitHub，地址为：https://github.com/p6spy/p6spy，直接找到 maven 的引用，放到项目的 pom.xml 中即可。（maven工程专用）

        <!-- https://mvnrepository.com/artifact/p6spy/p6spy -->

        <dependency>

            <groupId>p6spy</groupId>

            <artifactId>p6spy</artifactId>

            <version>3.0.0</version>

        </dependency>

二、自定义输出格式

需要自己实现一个类，覆盖默认方法，然后在 spy.properties 中配置使用。

出于安全需要，我改为使用 logger 在 debug 模式下输出。

package cn.wuxia.ueq.ucm.view.base.support;

import cn.wuxia.common.util.StringUtil;

import com.p6spy.engine.logging.Category;

import com.p6spy.engine.spy.appender.StdoutLogger;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

/**

 * Created by luodengxiong on 2017/04/25.

 */

public class P6SpyLogger extends StdoutLogger {

    protected final Logger logger = LoggerFactory.getLogger(this.getClass());

    /**

     * 重写输出方法

     * @param connectionId 连接id

     * @param now 当前时间

     * @param elapsed 执行时长，包括执行 SQL 和处理结果集的时间(可以参考来调优)

     * @param category 语句分类，statement、resultset 等

     * @param prepared 查询语句。可能是 prepared statement，表现为 select * from table1 where c1=?，问号参数形式

     * @param sql 含参数值的查询语句，如 select * from from table1 where c1=7

     */

    @Override

    public void logSQL(int connectionId, String now, long elapsed, Category category, String prepared, String sql) {

        if(!Category.COMMIT.equals(category) && !prepared.startsWith("select count("))

        this.logText(this.strategy.formatMessage(connectionId, now, elapsed, category.toString(), "-prepared-", sql));

    }

    @Override

    public void logText(String text) {

        StringBuilder sb = new StringBuilder();

        //匹配到最后一个|作为分隔符

        String[] arrString = text.split("\\|(?![^\\|]*\\|)");

        if (arrString.length > 1) {

            sb.append(arrString[0]);

            //去最后一段语句做替换进行格式化

            String sss=arrString[1].trim();

            if(StringUtil.isNotBlank(sss) && !";".equalsIgnoreCase(sss)){

                String sql = new SQLFormatter().format(arrString[1]);

                sb.append("\r\n");

                sb.append(sql);

                sb.append("\r\n");

            }else {

                sb.append(sss);

            }

            //this.getStream().println(sb.toString());

            logger.debug(sb.toString());

        } else {

            //this.getStream().println(text);

            logger.debug(text);

        }

        arrString = null;

    }

}

三、配置 spy.properties

经过几次摸索，才配置到最适合我自己的需要。主要是指定数据库驱动（我用的是 MySQL）日期格式化、使用单行还是多行，指定输出方式（控制台、log文件等），因为我只是 debug 的时候用的，所以直接输出到控制台了，其他方式我没有去试。

#################################################################

# P6Spy Options File                                            #

# See documentation for detailed instructions                   #

# http://p6spy.github.io/p6spy/2.0/configandusage.html          #

#################################################################

#################################################################

# MODULES                                                       #

#                                                               #

# Module list adapts the modular functionality of P6Spy.        #

# Only modules listed are active.                               #

# (default is com.p6spy.engine.logging.P6LogFactory and         #

# com.p6spy.engine.spy.P6SpyFactory)                            #

# Please note that the core module (P6SpyFactory) can't be      #

# deactivated.                                                  #

# Unlike the other properties, activation of the changes on     #

# this one requires reload.                                     #

#################################################################

#modulelist=com.p6spy.engine.spy.P6SpyFactory,com.p6spy.engine.logging.P6LogFactory,com.p6spy.engine.outage.P6OutageFactory

################################################################

# CORE (P6SPY) PROPERTIES                                      #

################################################################

# A comma separated list of JDBC drivers to load and register.

# (default is empty)

#

# Note: This is normally only needed when using P6Spy in an

# application server environment with a JNDI data source or when

# using a JDBC driver that does not implement the JDBC 4.0 API

# (specifically automatic registration).

driverlist=com.mysql.jdbc.Driver

# for flushing per statement

# (default is false)

#autoflush = false

# sets the date format using Java's SimpleDateFormat routine.

# In case property is not set, miliseconds since 1.1.1970 (unix time) is used (default is empty)

dateformat=yyyy-MM-dd HH:mm:ss

# prints a stack trace for every statement logged

#stacktrace=false

# if stacktrace=true, specifies the stack trace to print

#stacktraceclass=

# determines if property file should be reloaded

# Please note: reload means forgetting all the previously set

# settings (even those set during runtime - via JMX)

# and starting with the clean table

# (default is false)

#reloadproperties=false

# determines how often should be reloaded in seconds

# (default is 60)

#reloadpropertiesinterval=60

# specifies the appender to use for logging

# Please note: reload means forgetting all the previously set

# settings (even those set during runtime - via JMX)

# and starting with the clean table

# (only the properties read from the configuration file)

# (default is com.p6spy.engine.spy.appender.FileLogger)

#appender=com.p6spy.engine.spy.appender.Slf4JLogger

#appender=com.p6spy.engine.spy.appender.StdoutLogger

#appender=com.p6spy.engine.spy.appender.FileLogger

#自定义的SQL格式化输出

appender=cn.wuxia.ueq.ucm.view.base.support.P6SpyLogger

# name of logfile to use, note Windows users should make sure to use forward slashes in their pathname (e:/test/spy.log)

# (used for com.p6spy.engine.spy.appender.FileLogger only)

# (default is spy.log)

#logfile = spy.log

# append to the p6spy log file. if this is set to false the

# log file is truncated every time. (file logger only)

# (default is true)

#append=true

# class to use for formatting log messages (default is: com.p6spy.engine.spy.appender.SingleLineFormat)

logMessageFormat=com.p6spy.engine.spy.appender.SingleLineFormat

#logMessageFormat=com.p6spy.engine.spy.appender.MultiLineFormat

# format that is used for logging of the date/time/... (has to be compatible with java.text.SimpleDateFormat)

# (default is dd-MMM-yy)

databaseDialectDateFormat=yyyy-MM-dd HH:mm:ss

# whether to expose options via JMX or not

# (default is true)

#jmx=true

# if exposing options via jmx (see option: jmx), what should be the prefix used?

# jmx naming pattern constructed is: com.p6spy(.<jmxPrefix>)?:name=<optionsClassName>

# please note, if there is already such a name in use it would be unregistered first (the last registered wins)

# (default is none)

#jmxPrefix=

# if set to true, the execution time will be measured in nanoseconds as opposed to milliseconds

# (default is false)

#useNanoTime=false

#################################################################

# DataSource replacement                                        #

#                                                               #

# Replace the real DataSource class in your application server  #

# configuration with the name com.p6spy.engine.spy.P6DataSource #

# (that provides also connection pooling and xa support).       #

# then add the JNDI name and class name of the real             #

# DataSource here                                               #

#                                                               #

# Values set in this item cannot be reloaded using the          #

# reloadproperties variable. Once it is loaded, it remains      #

# in memory until the application is restarted.                 #

#                                                               #

#################################################################

#realdatasource=/RealMySqlDS

#realdatasourceclass=com.mysql.jdbc.jdbc2.optional.MysqlDataSource

#################################################################

# DataSource properties                                         #

#                                                               #

# If you are using the DataSource support to intercept calls    #

# to a DataSource that requires properties for proper setup,    #

# define those properties here. Use name value pairs, separate  #

# the name and value with a semicolon, and separate the         #

# pairs with commas.                                            #

#                                                               #

# The example shown here is for mysql                           #

#                                                               #

#################################################################

#realdatasourceproperties=port;3306,serverName;myhost,databaseName;jbossdb,foo;bar

#################################################################

# JNDI DataSource lookup                                        #

#                                                               #

# If you are using the DataSource support outside of an app     #

# server, you will probably need to define the JNDI Context     #

# environment.                                                  #

#                                                               #

# If the P6Spy code will be executing inside an app server then #

# do not use these properties, and the DataSource lookup will   #

# use the naming context defined by the app server.             #

#                                                               #

# The two standard elements of the naming environment are       #

# jndicontextfactory and jndicontextproviderurl. If you need    #

# additional elements, use the jndicontextcustom property.      #

# You can define multiple properties in jndicontextcustom,      #

# in name value pairs. Separate the name and value with a       #

# semicolon, and separate the pairs with commas.                #

#                                                               #

# The example shown here is for a standalone program running on #

# a machine that is also running JBoss, so the JDNI context     #

# is configured for JBoss (3.0.4).                              #

#                                                               #

# (by default all these are empty)                              #

#################################################################

#jndicontextfactory=org.jnp.interfaces.NamingContextFactory

#jndicontextproviderurl=localhost:1099

#jndicontextcustom=java.naming.factory.url.pkgs;org.jboss.nameing:org.jnp.interfaces

#jndicontextfactory=com.ibm.websphere.naming.WsnInitialContextFactory

#jndicontextproviderurl=iiop://localhost:900

################################################################

# P6 LOGGING SPECIFIC PROPERTIES                               #

################################################################

# filter what is logged

# please note this is a precondition for usage of: include/exclude/sqlexpression

# (default is false)

#filter=false

# comma separated list of strings to include

# please note that special characters escaping (used in java) has to be done for the provided regular expression

# (default is empty)

#include =

# comma separated list of strings to exclude

# (default is empty)

#exclude =

# sql expression to evaluate if using regex

# please note that special characters escaping (used in java) has to be done for the provided regular expression

# (default is empty)

#sqlexpression =

#list of categories to exclude: error, info, batch, debug, statement,

#commit, rollback and result are valid values

# (default is info,debug,result,resultset,batch)

#excludecategories=info,debug,result,resultset,batch

# Execution threshold applies to the standard logging of P6Spy.

# While the standard logging logs out every statement

# regardless of its execution time, this feature puts a time

# condition on that logging. Only statements that have taken

# longer than the time specified (in milliseconds) will be

# logged. This way it is possible to see only statements that

# have exceeded some high water mark.

# This time is reloadable.

#

# executionThreshold=integer time (milliseconds)

# (default is 0)

#executionThreshold=

################################################################

# P6 OUTAGE SPECIFIC PROPERTIES                                #

################################################################

# Outage Detection

#

# This feature detects long-running statements that may be indicative of

# a database outage problem. If this feature is turned on, it will log any

# statement that surpasses the configurable time boundary during its execution.

# When this feature is enabled, no other statements are logged except the long

# running statements. The interval property is the boundary time set in seconds.

# For example, if this is set to 2, then any statement requiring at least 2

# seconds will be logged. Note that the same statement will continue to be logged

# for as long as it executes. So if the interval is set to 2, and the query takes

# 11 seconds, it will be logged 5 times (at the 2, 4, 6, 8, 10 second intervals).

#

# outagedetection=true|false

# outagedetectioninterval=integer time (seconds)

#

# (default is false)

#outagedetection=false

# (default is 60)

#outagedetectioninterval=30

四、修改原数据库配置，改了这个才起作用

#jdbc.driver=com.mysql.jdbc.Driver

jdbc.driver=com.p6spy.engine.spy.P6SpyDriver

#jdbc.url=jdbc:mysql://localhost:3306/dbname

jdbc.url=jdbc:p6spy:mysql://localhost:3306/dbname

五、效果：

select

        order0_.order_no as col_0_0_

    from

        o_order order0_

    where

        order0_.user_id='s8FvofYDTvWeqwxMat_3Dw'

        and order0_.status<>'_0'

        and order0_.status<>'_4'

        and order0_.status='_2' limit 10

六、参考资料

格式化p6spy的输出日志

http://www.cnblogs.com/plain-heart/p/5012728.html

http://blog.csdn.net/kivenlee/article/details/6293179

sql格式化工具(从hibernate中弄出来的)

http://www.tuicool.com/articles/RNBrmy

http://zjfhw.iteye.com/blog/2062213

用 p6spy 来观察 Java 程序中执行的所有 SQL 语句

https://unmi.cc/p6spy-view-custom-java-executing-sql/

附：

package cn.wuxia.ueq.ucm.view.base.support;

/**

 * Created by luodengxiong on 2017/04/25.

 */

import java.util.HashSet;

import java.util.LinkedList;

import java.util.Set;

import java.util.StringTokenizer;

public class SQLFormatter {

    private static final Set<String> BEGIN_CLAUSES = new HashSet<String>();

    private static final Set<String> END_CLAUSES = new HashSet<String>();

    private static final Set<String> LOGICAL = new HashSet<String>();

    private static final Set<String> QUANTIFIERS = new HashSet<String>();

    private static final Set<String> DML = new HashSet<String>();

    private static final Set<String> MISC = new HashSet<String>();

    public static final String WHITESPACE = " \n\r\f\t";

    static {

        BEGIN_CLAUSES.add("left");

        BEGIN_CLAUSES.add("right");

        BEGIN_CLAUSES.add("inner");

        BEGIN_CLAUSES.add("outer");

        BEGIN_CLAUSES.add("group");

        BEGIN_CLAUSES.add("order");

        END_CLAUSES.add("where");

        END_CLAUSES.add("set");

        END_CLAUSES.add("having");

        END_CLAUSES.add("join");

        END_CLAUSES.add("from");

        END_CLAUSES.add("by");

        END_CLAUSES.add("join");

        END_CLAUSES.add("into");

        END_CLAUSES.add("union");

        LOGICAL.add("and");

        LOGICAL.add("or");

        LOGICAL.add("when");

        LOGICAL.add("else");

        LOGICAL.add("end");

        QUANTIFIERS.add("in");

        QUANTIFIERS.add("all");

        QUANTIFIERS.add("exists");

        QUANTIFIERS.add("some");

        QUANTIFIERS.add("any");

        DML.add("insert");

        DML.add("update");

        DML.add("delete");

        MISC.add("select");

        MISC.add("on");

    }

    static final String indentString = "    ";

    static final String initial = "\n    ";

    public String format(String source) {

        return new FormatProcess(source).perform();

    }

    private static class FormatProcess {

        boolean beginLine = true;

        boolean afterBeginBeforeEnd = false;

        boolean afterByOrSetOrFromOrSelect = false;

        boolean afterValues = false;

        boolean afterOn = false;

        boolean afterBetween = false;

        boolean afterInsert = false;

        int inFunction = 0;

        int parensSinceSelect = 0;

        private LinkedList<Integer> parenCounts = new LinkedList<Integer>();

        private LinkedList<Boolean> afterByOrFromOrSelects = new LinkedList<Boolean>();

        int indent = 1;

        StringBuilder result = new StringBuilder();

        StringTokenizer tokens;

        String lastToken;

        String token;

        String lcToken;

        public FormatProcess(String sql) {

            tokens = new StringTokenizer(

                    sql,

                    "()+*/-=<>'`\"[]," + WHITESPACE,

                    true

            );

        }

        public String perform() {

            result.append(initial);

            while (tokens.hasMoreTokens()) {

                token = tokens.nextToken();

                lcToken = token.toLowerCase();

                if ("'".equals(token)) {

                    String t;

                    do {

                        t = tokens.nextToken();

                        token += t;

                    }

                    while (!"'".equals(t) && tokens.hasMoreTokens()); // cannot handle single quotes

                } else if ("\"".equals(token)) {

                    String t;

                    do {

                        t = tokens.nextToken();

                        token += t;

                    }

                    while (!"\"".equals(t));

                }

                if (afterByOrSetOrFromOrSelect && ",".equals(token)) {

                    commaAfterByOrFromOrSelect();

                } else if (afterOn && ",".equals(token)) {

                    commaAfterOn();

                } else if ("(".equals(token)) {

                    openParen();

                } else if (")".equals(token)) {

                    closeParen();

                } else if (BEGIN_CLAUSES.contains(lcToken)) {

                    beginNewClause();

                } else if (END_CLAUSES.contains(lcToken)) {

                    endNewClause();

                } else if ("select".equals(lcToken)) {

                    select();

                } else if (DML.contains(lcToken)) {

                    updateOrInsertOrDelete();

                } else if ("values".equals(lcToken)) {

                    values();

                } else if ("on".equals(lcToken)) {

                    on();

                } else if (afterBetween && lcToken.equals("and")) {

                    misc();

                    afterBetween = false;

                } else if (LOGICAL.contains(lcToken)) {

                    logical();

                } else if (isWhitespace(token)) {

                    white();

                } else {

                    misc();

                }

                if (!isWhitespace(token)) {

                    lastToken = lcToken;

                }

            }

            return result.toString();

        }

        private void commaAfterOn() {

            out();

            indent--;

            newline();

            afterOn = false;

            afterByOrSetOrFromOrSelect = true;

        }

        private void commaAfterByOrFromOrSelect() {

            out();

            newline();

        }

        private void logical() {

            if ("end".equals(lcToken)) {

                indent--;

            }

            newline();

            out();

            beginLine = false;

        }

        private void on() {

            indent++;

            afterOn = true;

            newline();

            out();

            beginLine = false;

        }

        private void misc() {

            out();

            if ("between".equals(lcToken)) {

                afterBetween = true;

            }

            if (afterInsert) {

                newline();

                afterInsert = false;

            } else {

                beginLine = false;

                if ("case".equals(lcToken)) {

                    indent++;

                }

            }

        }

        private void white() {

            if (!beginLine) {

                result.append(" ");

            }

        }

        private void updateOrInsertOrDelete() {

            out();

            indent++;

            beginLine = false;

            if ("update".equals(lcToken)) {

                newline();

            }

            if ("insert".equals(lcToken)) {

                afterInsert = true;

            }

        }

        @SuppressWarnings({"UnnecessaryBoxing"})

        private void select() {

            out();

            indent++;

            newline();

            parenCounts.addLast(Integer.valueOf(parensSinceSelect));

            afterByOrFromOrSelects.addLast(Boolean.valueOf(afterByOrSetOrFromOrSelect));

            parensSinceSelect = 0;

            afterByOrSetOrFromOrSelect = true;

        }

        private void out() {

            result.append(token);

        }

        private void endNewClause() {

            if (!afterBeginBeforeEnd) {

                indent--;

                if (afterOn) {

                    indent--;

                    afterOn = false;

                }

                newline();

            }

            out();

            if (!"union".equals(lcToken)) {

                indent++;

            }

            newline();

            afterBeginBeforeEnd = false;

            afterByOrSetOrFromOrSelect = "by".equals(lcToken)

                    || "set".equals(lcToken)

                    || "from".equals(lcToken);

        }

        private void beginNewClause() {

            if (!afterBeginBeforeEnd) {

                if (afterOn) {

                    indent--;

                    afterOn = false;

                }

                indent--;

                newline();

            }

            out();

            beginLine = false;

            afterBeginBeforeEnd = true;

        }

        private void values() {

            indent--;

            newline();

            out();

            indent++;

            newline();

            afterValues = true;

        }

        @SuppressWarnings({"UnnecessaryUnboxing"})

        private void closeParen() {

            parensSinceSelect--;

            if (parensSinceSelect < 0) {

                indent--;

                parensSinceSelect = parenCounts.removeLast().intValue();

                afterByOrSetOrFromOrSelect = afterByOrFromOrSelects.removeLast().booleanValue();

            }

            if (inFunction > 0) {

                inFunction--;

                out();

            } else {

                if (!afterByOrSetOrFromOrSelect) {

                    indent--;

                    newline();

                }

                out();

            }

            beginLine = false;

        }

        private void openParen() {

            if (isFunctionName(lastToken) || inFunction > 0) {

                inFunction++;

            }

            beginLine = false;

            if (inFunction > 0) {

                out();

            } else {

                out();

                if (!afterByOrSetOrFromOrSelect) {

                    indent++;

                    newline();

                    beginLine = true;

                }

            }

            parensSinceSelect++;

        }

        private static boolean isFunctionName(String tok) {

            final char begin = tok.charAt(0);

            final boolean isIdentifier = Character.isJavaIdentifierStart(begin) || '"' == begin;

            return isIdentifier &&

                    !LOGICAL.contains(tok) &&

                    !END_CLAUSES.contains(tok) &&

                    !QUANTIFIERS.contains(tok) &&

                    !DML.contains(tok) &&

                    !MISC.contains(tok);

        }

        private static boolean isWhitespace(String token) {

            return WHITESPACE.indexOf(token) >= 0;

        }

        private void newline() {

            result.append("\n");

            for (int i = 0; i < indent; i++) {

                result.append(indentString);

            }

            beginLine = true;

        }

    }

    public static void main(String[] args) {

        String sql = new SQLFormatter().format("select * from t_sss");

        System.out.println(sql);

    }

}

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