Update README.md

Author: purocean

README.md

@@ -1,10 +1,90 @@
 # kotlin-db-migration
-数据库迁移
+
+1. simple & light
+1. name based version
+1. support dry run
+1. support code migration and sql migration
+
+```kotlin
+@Component
+class Migration: InitializingBean, ApplicationListener<ApplicationReadyEvent>{
+    @Value("\${spring.datasource.url}")
+    val dbUrl: String = ""
+
+    @Value("\${spring.datasource.username}")
+    val dbUsername: String = ""
+
+    @Value("\${spring.datasource.password}")
+    val dbPassword: String = ""
+
+    @Autowired
+    lateinit var migrationConfig: MigrationConfigProperties
+
+    @Autowired
+    protected var context: ApplicationContext? = null
+
+    override fun afterPropertiesSet() {
+        if (migrationConfig.isEnable) {
+            Migrate(dbUrl, dbUsername, dbPassword).run(migrationConfig.isDryRun)
+        }
+    }
+
+    override fun onApplicationEvent(event: ApplicationReadyEvent) {
+        Migrate(dbUrl, dbUsername, dbPassword).runCode(context, migrationConfig.isDryRun)
+    }
+}
+```
 
 ```kotlin
+class M2018_03_15_105104_test_migration: CodeMigration<ApplicationContext> {
+    override fun run(context: ApplicationContext) {
+        // context.getBean("xxx")
+        // do what every you want
+    }
+}
+```
+
+```gradle
+    // ./gradlew :common:createMigration -Ptp=code -Pmn=create_role_table
+    createMigration.doLast {
+        if (project.hasProperty('mn')) {
+            def content = "\n"
+            def fileName = ""
+            def path = ""
+
+            if (project.hasProperty('tp') && project.tp == 'code') {
+                def className = "M" + (new Date()).format('yyyy_MM_dd_HHmmss_') + "${project.mn}"
+                fileName = "${className}.kt"
+                path = "$projectDir/src/main/kotlin/db/migrations"
+                content = """
+package db.migrations
+
+import info.purocean.dbmigration.CodeMigration
+import org.springframework.context.ApplicationContext
+
+class ${className}: CodeMigration<ApplicationContext> {
+    override fun run(context: ApplicationContext) {
+        // TODO
+    }
+}
+"""
+            } else {
+                fileName = (new Date()).format('yyyy_MM_dd_HHmmss_') + "${project.mn}.sql"
+                path = "$projectDir/src/main/resources/db/migrations"
+            }
+
+            new File(path).mkdirs()
+
+            def file = new File("$path/$fileName")
+
+            file.createNewFile()
 
-val migrate = Migrate("jdbc:mysql://localhost/db_migration?useUnicode=true&characterEncoding=utf8&serverTimezone=PRC&useSSL=true", "root", "yang")
+            file.text = content
 
-migrate.run()
+            println("created：$path/$fileName")
+        } else {
+            println("no name!")
+        }
+    }
 
 ```