org.litepal.tablemanager

类 Dropper

java.lang.Object

org.litepal.LitePalBase

org.litepal.tablemanager.Generator

org.litepal.tablemanager.AssociationCreator

org.litepal.tablemanager.AssociationUpdater

org.litepal.tablemanager.Dropper

public class Dropper
extends AssociationUpdater

When developers defined some model classes and define them in the mapping list. All corresponding tables will be created automatically. But developers might realize some model classes are useless or can be optimized to remove, and they somehow drop the model classes. If the tables are still in the database, it will be a mess soon. So this class helps do the dropping job. Keep developers' database synchronized and clean.

从以下版本开始:

1.0

字段概要

从类继承的字段 org.litepal.tablemanager.AssociationUpdater

mDb, TAG

构造器概要

构造器

构造器和说明
Dropper()

方法概要

限定符和类型	方法和说明
protected void	createOrUpgradeTable(android.database.sqlite.SQLiteDatabase db, boolean force) Analyzing the table model, to see which tables has no model classes anymore and can be dropped.
protected void	createOrUpgradeTable(TableModel tableModel, android.database.sqlite.SQLiteDatabase db, boolean force)
protected java.lang.String	generateCreateTableSQL(TableModel tableModel) Generate a create table SQL by analyzing the TableModel.
protected java.lang.String	generateDropTableSQL(TableModel tableModel) Generate a SQL for dropping table.
protected java.lang.String[]	getCreateTableSQLs(TableModel tableModel, android.database.sqlite.SQLiteDatabase db, boolean force) When creating a new table, it should always try to drop the same name table if exists.

从类继承的方法 org.litepal.tablemanager.AssociationUpdater

addOrUpdateAssociation, clearCopyInTableSchema, dropTables, generateAlterToTempTableSQL, generateDataMigrationSQL, generateDropTempTableSQL, getForeignKeyColumns, getTableModelFromDB, getTempTableName, isForeignKeyColumn, removeColumns

从类继承的方法 org.litepal.tablemanager.AssociationCreator

addForeignKeyColumn, generateAddColumnSQL, generateCreateTableSQL, generateDropTableSQL, giveTableSchemaACopy, isForeignKeyColumnFormat

从类继承的方法 org.litepal.tablemanager.Generator

execute, getAllAssociations, getAllTableModels

从类继承的方法 org.litepal.LitePalBase

getAssociationInfo, getAssociations, getColumnType, getForeignKeyColumnName, getGenericModels, getGenericTypeClass, getGenericTypeName, getSupportedFields, getSupportedGenericFields, getTableModel, isCollection, isIdColumn, isList, isSet

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

Dropper

public Dropper()

方法详细资料

createOrUpgradeTable

protected void createOrUpgradeTable(android.database.sqlite.SQLiteDatabase db,
                                    boolean force)

Analyzing the table model, to see which tables has no model classes anymore and can be dropped.

指定者:

createOrUpgradeTable 在类中 AssociationUpdater

参数:

db - Instance of SQLiteDatabase.

force - Drop the table first if it already exists.

createOrUpgradeTable

protected void createOrUpgradeTable(TableModel tableModel,
                                    android.database.sqlite.SQLiteDatabase db,
                                    boolean force)

getCreateTableSQLs

protected java.lang.String[] getCreateTableSQLs(TableModel tableModel,
                                                android.database.sqlite.SQLiteDatabase db,
                                                boolean force)

When creating a new table, it should always try to drop the same name table if exists. This method create a SQL array for the whole create table job.

参数:

tableModel - The table model.

db - Instance of SQLiteDatabase.

force - Drop the table first if it already exists.

返回:

A SQL array contains drop table if it exists and create new table.

generateDropTableSQL

protected java.lang.String generateDropTableSQL(TableModel tableModel)

Generate a SQL for dropping table.

参数:

tableModel - The table model.

返回:

A SQL to drop table.

generateCreateTableSQL

protected java.lang.String generateCreateTableSQL(TableModel tableModel)

Generate a create table SQL by analyzing the TableModel. Note that it will always generate a SQL with id/_id column in it as primary key, and this id is auto increment as integer. Do not try to assign or modify it.

参数:

tableModel - Use the TableModel to get table name and columns name to generate SQL.

返回:

A generated create table SQL.