package com.dayu.general.dao
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import android.content.Context
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import android.os.Environment
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import androidx.room.Room
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import androidx.room.migration.Migration
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import androidx.sqlite.db.SupportSQLiteDatabase
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import java.io.File
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class BaseDaoSingleton {
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companion object {
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var baseDao: AppDataBase? = null
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var AsynchBaseDao: AppDataBase? = null
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@JvmField
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val SqlitePath: String =
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Environment.getExternalStorageDirectory().absolutePath + File.separator + ".dayu" + File.separator + "data" + File.separator
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// 数据库迁移策略：从版本3迁移到版本4
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private val MIGRATION_3_4 = object : Migration(3, 4) {
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override fun migrate(database: SupportSQLiteDatabase) {
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// 这里不需要实际的数据库结构修改，因为我们只是更新了Room版本
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// 如果需要修改数据库结构，可以在这里添加 ALTER TABLE 语句
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}
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}
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fun getInstance(context: Context): AppDataBase {
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if (baseDao == null) {
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baseDao = Room.databaseBuilder<AppDataBase>(
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context,
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AppDataBase::class.java,
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SqlitePath + "ConfigurationData_generalV1"
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).allowMainThreadQueries().build()
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}
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return baseDao as AppDataBase
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}
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fun getAsynchInstance(context: Context): AppDataBase {
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if (AsynchBaseDao == null) {
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synchronized(this) {
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if (AsynchBaseDao == null) {
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AsynchBaseDao = Room.databaseBuilder(
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context.applicationContext,
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AppDataBase::class.java,
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"GeneralLibrary.db"
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)
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.addMigrations(MIGRATION_3_4) // 添加迁移策略
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.build()
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}
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}
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}
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return AsynchBaseDao as AppDataBase
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}
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// 销毁数据库实例
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fun destroyInstance() {
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AsynchBaseDao = null
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}
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}
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// companion object {
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// fun getAsynchInstance(baseActivity: BaseActivity): AppDataBase? {
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// return getAsynchInstance(baseActivity)
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// }
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// }
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}
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