Unity3d 中 将远程 MySQL 数据库转换为本地 Sqlite

1、创建MySQL2Sqlite脚本mysql2sqlite.sh：（代码地址：https://gist.github.com/esperlu/943776）

#!/bin/sh

 

# Converts a mysqldump file into a Sqlite 3 compatible file. It also extracts the MySQL `KEY xxxxx` from the

# CREATE block and create them in separate commands _after_ all the INSERTs.

 

# Awk is choosen because it's fast and portable. You can use gawk, original awk or even the lightning fast mawk.

# The mysqldump file is traversed only once.

 

# Usage: $ ./mysql2sqlite mysqldump-opts db-name | sqlite3 database.sqlite

# Example: $ ./mysql2sqlite --no-data -u root -pMySecretPassWord myDbase | sqlite3 database.sqlite

 

# Thanks to and @artemyk and @gkuenning for their nice tweaks.

 

mysqldump  --compatible=ansi --skip-extended-insert --compact  "$@" | \

 

awk '

 

BEGIN {

    FS=",$"

    print "PRAGMA synchronous = OFF;"

    print "PRAGMA journal_mode = MEMORY;"

    print "BEGIN TRANSACTION;"

}

 

# CREATE TRIGGER statements have funny commenting.  Remember we are in trigger.

/^\/\*.*CREATE.*TRIGGER/ {

    gsub( /^.*TRIGGER/, "CREATE TRIGGER" )

    print

    inTrigger = 1

    next

}

 

# The end of CREATE TRIGGER has a stray comment terminator

/END \*\/;;/ { gsub( /\*\//, "" ); print; inTrigger = 0; next }

 

# The rest of triggers just get passed through

inTrigger != 0 { print; next }

 

# Skip other comments

/^\/\*/ { next }

 

# Print all `INSERT` lines. The single quotes are protected by another single quote.

/INSERT/ {

    gsub( /\\\047/, "\047\047" )

    gsub(/\\n/, "\n")

    gsub(/\\r/, "\r")

    gsub(/\\"/, "\"")

    gsub(/\\\\/, "\\")

    gsub(/\\\032/, "\032")

    print

    next

}

 

# Print the `CREATE` line as is and capture the table name.

/^CREATE/ {

    print

    if ( match( $0, /\"[^\"]+/ ) ) tableName = substr( $0, RSTART+1, RLENGTH-1 ) 

}

 

# Replace `FULLTEXT KEY` or any other `XXXXX KEY` except PRIMARY by `KEY`

/^  [^"]+KEY/ && !/^  PRIMARY KEY/ { gsub( /.+KEY/, "  KEY" ) }

 

# Get rid of field lengths in KEY lines

/ KEY/ { gsub(/\([0-9]+\)/, "") }

 

# Print all fields definition lines except the `KEY` lines.

/^  / && !/^(  KEY|\);)/ {

    gsub( /AUTO_INCREMENT|auto_increment/, "" )

    gsub( /(CHARACTER SET|character set) [^ ]+ /, "" )

    gsub( /DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP|default current_timestamp on update current_timestamp/, "" )

    gsub( /(COLLATE|collate) [^ ]+ /, "" )

    gsub(/(ENUM|enum)[^)]+\)/, "text ")

    gsub(/(SET|set)\([^)]+\)/, "text ")

    gsub(/UNSIGNED|unsigned/, "")

    if (prev) print prev ","

    prev = $1

}

 

# `KEY` lines are extracted from the `CREATE` block and stored in array for later print 

# in a separate `CREATE KEY` command. The index name is prefixed by the table name to 

# avoid a sqlite error for duplicate index name.

/^(  KEY|\);)/ {

    if (prev) print prev

    prev=""

    if ($0 == ");"){

        print

    } else {

        if ( match( $0, /\"[^"]+/ ) ) indexName = substr( $0, RSTART+1, RLENGTH-1 ) 

        if ( match( $0, /\([^()]+/ ) ) indexKey = substr( $0, RSTART+1, RLENGTH-1 ) 

        key[tableName]=key[tableName] "CREATE INDEX \"" tableName "_" indexName "\" ON \"" tableName "\" (" indexKey ");\n"

    }

}

 

# Print all `KEY` creation lines.

END {

    for (table in key) printf key[table]

    print "END TRANSACTION;"

}

'

exit 0

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2、创建convertDB.sh来调用mysql2sqlite.sh：

rm -rf sqlite_db_name

sh mysql2sqlite.sh -umysql_user_name -pmysql_user_pwd -hmysql_host mysql_db_name | sqlite3 sqlite_db_name

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修改相应的参数：

　sqlite_db_name （要转换成的sqlite数据库名称）

mysql_user_name （mysql用户名称）

mysql_user_pwd （mysql用户密码）

mysql_host （mysql服务器ip地址）

mysql_db_name（要转换的mysql数据库名称）

3、在Unity3d中执行shell脚本（放在Editor文件夹下）：

using UnityEngine;

using System.Collections;

using UnityEditor;

using System.IO;

using System.Diagnostics;



public class ChangeDB  {

static string sqliteDBpath = Application.streamingAssetsPath + "/dbFile/";

    static string sqliteDBname = "sqlite_db_name.db";

    [MenuItem("Tools/Mysql to Sqlite")]

    public static void mysqlToSqlite ()

    {

        if(File.Exists(sqliteDBpath)){

            UnityEngine.Debug.Log("delete old sqlite db file...");

            File.Delete(sqliteDBpath+sqliteDBname);

        }

        if(File.Exists(sqliteDBpath+sqliteDBname+".meta")){

            File.Delete(sqliteDBpath+sqliteDBname+".meta");

        }        

        //start to convert mysql to sql

        UnityEngine.Debug.Log("start convert...");

        ProcessStartInfo proc = new ProcessStartInfo();

        proc.WorkingDirectory = sqliteDBpath;

        proc.FileName = "sh";

        proc.Arguments = "convertDB.sh";

        proc.UseShellExecute = false;

        proc.Verb = "";        

        Process.Start(proc);

    }

}

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4、点击Tools下的 Mysql to Sqlite 就可以转换了

 5、注意在iOS下可以将sqlite数据库放在 Application.streamingAssetsPath 目录下直接访问

      在Android下访问Application.streamingAssetsPath下的文件必须先调用下面的方法解压一下：

string sqlitedbPath = Application.streamingAssetsPath + "/dbFile/dbname.db";



string filepath = Application.persistentDataPath + "/dbname.db";



 IEnumerator LoadSqliteDBForAndroid (string url,string newPath){



using(WWW www = new WWW(url)){



yieldreturn www;



if (www.error != null)



Debug.LogError("WWW download:" + www.error);



File.WriteAllBytes(newPath, www.bytes);



 



LoadAllResource();



 



Debug.Log("android db download finished");



        }



   }

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参考资料：

1、https://gist.github.com/esperlu/943776

2、http://docs.unity3d.com/Documentation/ScriptReference/Application-streamingAssetsPath.html