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Android操作SQLite数据库

发布时间:2020-12-14 23:20:03 所属栏目:Java 来源:网络整理
导读:今天PHP站长网 52php.cn把收集自互联网的代码分享给大家,仅供参考。 import java.util.Date;import android.database.sqlite.SQLiteDatabase;import android.util.Log;import com.pls.share.db.entity.TUser;/** * @auth

以下代码由PHP站长网 52php.cn收集自互联网

现在PHP站长网小编把它分享给大家,仅供参考

import java.util.Date;

import android.database.sqlite.SQLiteDatabase;
import android.util.Log;

import com.pls.share.db.entity.TUser;

/**
 * @author [email?protected]
 * 
 * 调用示例
 */
public class Example {
    static final String tag="Example";

    private SQLiteDatabase db;
    public SQLiteDatabase createDatabase(){     
        SQLiteDatabase db=SQLiteDatabase.create(null);      
        String createdb=
                "CREATE TABLE IF NOT EXISTS t_user("
                +"id         VARCHAR(64) PRIMARY KEY,"
                +"name       VARCHAR(512),"
                +"status     INTEGER NOT NULL DEFAULT 0,"
                +"createTime DATETIME"
                +");";
        db.execSQL(createdb);        
        return db;
    }

    public Example(){
        db=createDatabase();
    }

    public void insert(){
        SqliteDAO dao=new SqliteDAO(db);

        TUser user=new TUser();
        user.setId("user001");
        user.setName("tsc9526");
        user.setCreateTime(new Date());
        user.setStatus(1);

        //插入对象到数据库
        dao.insert(user);
    }

    public void load(){
        SqliteDAO dao=new SqliteDAO(db);

        TUser user=new TUser();
        user.setId("user001");

        //载入数据库到对象
        dao.loadByPrimaryKey(user); 

        Log.i(tag,"ID: "+user.getId()+",name: "+user.getName()+",status: "+user.getStatus());
    }   

} 

import java.util.Date;

import com.pls.share.db.annotation.Id;
import com.pls.share.db.annotation.Table;
import com.pls.share.db.annotation.Transient;

/**
 * @author [email?protected]
 * 
 * 数据库实体对象
 */
@Table(name="t_user")
public class TUser{
    /**
     * 主键字段
     */ 
    @Id
    private String id;

    private Integer status;  

    private String name;

    private Date createTime;

    /**
     * 非数据库字段
     */
    @Transient
    private String detail;

    public TUser(){}

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public Integer getStatus() {
        return status;
    }

    public void setStatus(Integer status) {
        this.status = status;
    }

    public Date getCreateTime() {
        return createTime;
    }

    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }

    public String getDetail() {
        return detail;
    }

    public void setDetail(String detail) {
        this.detail = detail;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }    

}

import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.util.Log;

import com.pls.share.db.annotation.Id;
import com.pls.share.db.annotation.Table;
import com.pls.share.db.annotation.Transient;

/**
 * @author [email?protected]
 *  
 */
public class SqliteDAO{ 
    static final String tag="DAO";

    /**
     * 访问的数据库
     */
    private SQLiteDatabase db;

    /**
     * 数据插入冲突处理方式:
     * 0-忽略
     * 1-抛出异常
     * 2-替换数据
     */
    private int conflictType=2;

    public SqliteDAO(SQLiteDatabase db){
        this.db=db;         
    }

    public SQLiteDatabase getSQLiteDatabase(){
        return db;
    }

    /**
     * 插入对象到数据库,存储对象的所有字段到数据库的对应字段,包括NULL字段.
     * @param entity  待插入的对象
     * @return 如果插入数据库成功则返回该对象,否则返回NULL
     */
    public <T> T insert(T entity){
        return insert(entity,false);
    }

    /**
     * 插入对象到数据库,仅存储对象的非空字段到数据库,对象的NULL字段将被忽略.
     * @param entity 待插入的对象
     * @return 如果插入数据库成功则返回该对象,否则返回NULL
     */
    public <T> T insertSelective(T entity){
        return insert(entity,true);
    }

    private <T> T insert(T entity,boolean selective){       
        ContentValues values=getContentValues(entity,selective);

        T exist_obj=this.loadByPrimaryKey(entity);
        if(exist_obj!=null){
            return exist_obj;
        }

        long r=0;
        if(conflictType==2){
            r=db.replace(getTableName(entity),null,values);            
        }else{
            r=db.insert(getTableName(entity),values);             
        }

        if(r>=0){
            return entity;
        }

        return null;                
    }

    /**
     * 根据主键删除数据
     * @param entity 待删除的对象,主键只必须设置.
     * @return
     */
    public <T> int delete(T entity){
        Object[] args=getPrimarySelectionAndArgs(entity);
        return db.delete(getTableName(entity),(String)args[0],(String[])args[1]);     
    }

    /**
     * 根据主键从数据库载入一条记录到对象
     * @param entity 数据实体(必须初始化主键字段)
     * @return 成功则返回的该数据库实体,失败则返回NULL
     */
    public <T> T loadByPrimaryKey(T entity){
        Object[] args=getPrimarySelectionAndArgs(entity);
        Cursor cursor=db.query(getTableName(entity),(String[])args[1],null);
        try{
            if(cursor.moveToNext()){
                T db_entity=getEntity(cursor,entity);
                return db_entity;
            }else{
                return null;
            }
        }finally{
            cursor.close();
        }
    }

    @SuppressWarnings("unchecked")
    public <T> List<T> loadAll(T entity,String orderBy){    
        List<T> entities=new ArrayList<T>();

        Cursor cursor=db.query(getTableName(entity),orderBy);
        try{
            if(cursor!=null && cursor.moveToFirst()){
                T obj=(T)entity.getClass().newInstance();
                getEntity(cursor,obj);

                entities.add(obj);

            }while(cursor.moveToNext());

            return entities;
        }catch(Exception e){
            Log.e(tag,""+e,e);

            return entities;
        }finally{
            cursor.close();
        }
    }

    /**
     * 更新数据库实体,更新对象的所有字段到数据库的对应字段,包括NULL字段.
     * @param entity 待更新的对象(必须包含主键)
     * @return 成功更新的记录数
     */
    public int updateByPrimaryKey(Object entity){
        return updateByPrimaryKey(entity,false);
    }

    /**
     * 更新数据库实体,仅更新对象的非空字段到数据库的对应字段,对象的NULL字段将被忽略.
     * @param entity 待更新的对象(必须包含主键)
     * @return 成功更新的记录数
     */
    public int updateByPrimaryKeySelective(Object entity){
        return updateByPrimaryKey(entity,true);
    }

    private int updateByPrimaryKey(Object entity,boolean selective){
        ContentValues values=getContentValues(entity,selective);
        Object[] args=getPrimarySelectionAndArgs(entity);

        int r=db.update(getTableName(entity),values,(String[])args[1]);

        return r; 
    }

    /**
     * 从对象中解析出主键字段,以及主键字段对应的值 
     * @param entity
     * @return
     */
    private Object[] getPrimarySelectionAndArgs(Object entity){
        Object[] ret=new Object[2];
        String selection=null;
        List<String> args=new ArrayList<String>();
        try{
            Class<?> entity_class=entity.getClass();            
            Field[] fs=entity_class.getDeclaredFields();
            for(Field f:fs){
                if(isPrimaryKey(f)){                
                    Method get=getGetMethod(entity_class,f);
                    if(get!=null){
                        Object o=get.invoke(entity);                        
                        String value=null;
                        if(o!=null){
                            value=o.toString();
                            if(selection==null){
                                selection=f.getName()+"=?";                             
                            }else{
                                selection+=" AND "+f.getName()+"=?";
                            }

                            args.add(value);

                        }else{
                            throw new RuntimeException("Primary key: "+f.getName()+" must not be null");
                        }
                    }
                }
            }           
            if(selection==null){
                throw new RuntimeException("Primary key not found!");
            }

            ret[0]=selection;
            ret[1]=args.toArray(new String[args.size()]);
            return ret;
        }catch(Exception e){
            throw new RuntimeException(e.getMessage(),e);
        }
    }

    /**
     * 将对象转换为ContentValues
     * @param entity
     * @param selective
     * @return
     */
    private ContentValues getContentValues(Object entity,boolean selective){
        ContentValues values=new ContentValues();
        try{
            Class<?> entity_class=entity.getClass();            
            Field[] fs=entity_class.getDeclaredFields();
            for(Field f:fs){
                if(isTransient(f)==false){              
                    Method get=getGetMethod(entity_class,f);
                    if(get!=null){
                        Object o=get.invoke(entity);
                        if(!selective || (selective && o!=null)){
                            String name=f.getName();                        
                            Class<?> type=f.getType();
                            if(type==String.class){
                                values.put(name,(String)o);
                            }else if(type==int.class || type==Integer.class){
                                values.put(name,(Integer)o);
                            }else if(type==float.class || type==Float.class){
                                values.put(name,(Float)o);
                            }else if(type==long.class || type==Long.class){
                                values.put(name,(Long)o);
                            }else if(type==Date.class){
                                values.put(name,datetimeToString((Date)o));
                            }else{  
                                values.put(name,o.toString());                              
                            }
                        }
                    }
                }
            }
            return values;
        }catch(Exception e){
            throw new RuntimeException(e.getMessage(),e);
        }
    }

    /**
     * 将数据库记录转换为对象
     * 
     * @param cursor
     * @param entity
     * @return
     */
    private <T> T getEntity(Cursor cursor,T entity){   
        try{
            Class<?> entity_class=entity.getClass();

            Field[] fs=entity_class.getDeclaredFields();
            for(Field f:fs){
                int index=cursor.getColumnIndex(f.getName());
                if(index>=0){                   
                    Method set=getSetMethod(entity_class,f);
                    if(set!=null){
                        String value=cursor.getString(index);                                           
                        if(cursor.isNull(index)){
                            value=null;
                        }
                        Class<?> type=f.getType();
                        if(type==String.class){
                            set.invoke(entity,value);
                        }else if(type==int.class || type==Integer.class){
                            set.invoke(entity,value==null?(Integer)null:Integer.parseInt(value));
                        }else if(type==float.class || type==Float.class){
                            set.invoke(entity,value==null?(Float)null:Float.parseFloat(value));
                        }else if(type==long.class || type==Long.class){
                            set.invoke(entity,value==null?(Long)null:Long.parseLong(value));
                        }else if(type==Date.class){
                            set.invoke(entity,value==null?(Date)null:stringToDateTime(value));
                        }else{  
                            set.invoke(entity,value);                       
                        }                            
                    }
                }
            }           
            return entity;
        }catch(Exception e){
            throw new RuntimeException(e.getMessage(),e);
        }
    }

    private String datetimeToString(Date d){
        SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        if(d!=null){
            return sdf.format(d);
        }
        return null;
    }

    private Date stringToDateTime(String s){
        SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        if(s!=null){
            try {
                return sdf.parse(s);
            } catch (ParseException e) {             
                Log.e(tag,"解析时间错误: "+s,e);
            }
        }
        return null;
    }

    private Method getGetMethod(Class<?> entity_class,Field f){
        String fn=f.getName();
        String mn="get"+fn.substring(0,1).toUpperCase()+fn.substring(1);
        try{            
            return entity_class.getDeclaredMethod(mn);
        }catch(NoSuchMethodException e){
            Log.w(tag,"Method: "+mn+" not found.");

            return null;
        }
    }

    private Method getSetMethod(Class<?> entity_class,Field f){
        String fn=f.getName();
        String mn="set"+fn.substring(0,1).toUpperCase()+fn.substring(1);
        try{            
            return entity_class.getDeclaredMethod(mn,f.getType());
        }catch(NoSuchMethodException e){
            Log.w(tag,"Method: "+mn+" not found.");

            return null;
        }
    }

    /**
     * 检查是否为主键字段
     */
    private boolean isPrimaryKey(Field f){       
        Annotation an=f.getAnnotation(Id.class);
        if(an!=null){
            return true;             
        }
        return false;
    }

    private boolean isTransient(Field f){        
        Annotation an=f.getAnnotation(Transient.class);
        if(an!=null){
            return true;             
        }
        return false;
    }

    private String getTableName(Object entity){
        Table table=entity.getClass().getAnnotation(Table.class);
        String name= table.name();
        return name;
    }

    public int getConflictType() {
        return conflictType;
    }

    public void setConflictType(int conflictType) {
        this.conflictType = conflictType;
    }

}

Android SQLite数据库访问对象

更多
java
Android
SQLite
package com.pls.share.db; import java.util.Date; import android.database.sqlite.SQLiteDatabase; import android.util.Log; import com.pls.share.db.entity.TUser; /**
 * @author [email?protected]
 * 
 * 调用示例
 */ public class Example { static final String tag="Example"; private SQLiteDatabase db; public SQLiteDatabase createDatabase(){ SQLiteDatabase db=SQLiteDatabase.create(null); String createdb= "CREATE TABLE IF NOT EXISTS t_user(" +"id         VARCHAR(64) PRIMARY KEY," +"name       VARCHAR(512)," +"status     INTEGER NOT NULL DEFAULT 0," +"createTime DATETIME" +");"; db.execSQL(createdb); return db; } public Example(){ db=createDatabase(); } public void insert(){ SqliteDAO dao=new SqliteDAO(db); TUser user=new TUser(); user.setId("user001"); user.setName("tsc9526"); user.setCreateTime(new Date()); user.setStatus(1); //插入对象到数据库 dao.insert(user); } public void load(){ SqliteDAO dao=new SqliteDAO(db); TUser user=new TUser(); user.setId("user001"); //载入数据库到对象 dao.loadByPrimaryKey(user); Log.i(tag,status: "+user.getStatus()); } } 
package com.pls.share.db.entity; import java.util.Date; import com.pls.share.db.annotation.Id; import com.pls.share.db.annotation.Table; import com.pls.share.db.annotation.Transient; /**
 * @author [email?protected]
 * 
 * 数据库实体对象
 */ @Table(name="t_user") public class TUser{ /**
     * 主键字段
     */ @Id private String id; private Integer status; private String name; private Date createTime; /**
     * 非数据库字段
     */ @Transient private String detail; public TUser(){} public String getId() { return id; } public void setId(String id) { this.id = id; } public Integer getStatus() { return status; } public void setStatus(Integer status) { this.status = status; } public Date getCreateTime() { return createTime; } public void setCreateTime(Date createTime) { this.createTime = createTime; } public String getDetail() { return detail; } public void setDetail(String detail) { this.detail = detail; } public String getName() { return name; } public void setName(String name) { this.name = name; } } 
package com.pls.share.db; import java.lang.annotation.Annotation; import java.lang.reflect.Field; import java.lang.reflect.Method; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.List; import android.content.ContentValues; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.util.Log; import com.pls.share.db.annotation.Id; import com.pls.share.db.annotation.Table; import com.pls.share.db.annotation.Transient; /**
 * @author [email?protected]
 *  
 */ public class SqliteDAO{ static final String tag="DAO"; /**
     * 访问的数据库
     */ private SQLiteDatabase db; /**
     * 数据插入冲突处理方式:
     * 0-忽略
     * 1-抛出异常
     * 2-替换数据
     */ private int conflictType=2; public SqliteDAO(SQLiteDatabase db){ this.db=db; } public SQLiteDatabase getSQLiteDatabase(){ return db; } /**
     * 插入对象到数据库,否则返回NULL
     */ public <T> T insert(T entity){ return insert(entity,false); } /**
     * 插入对象到数据库,否则返回NULL
     */ public <T> T insertSelective(T entity){ return insert(entity,true); } private <T> T insert(T entity,boolean selective){ ContentValues values=getContentValues(entity,selective); T exist_obj=this.loadByPrimaryKey(entity); if(exist_obj!=null){ return exist_obj; } long r=; if(conflictType==2){ r=db.replace(getTableName(entity),values); }else{ r=db.insert(getTableName(entity),values); } if(r>=){ return entity; } return null; } /**
     * 根据主键删除数据
     * @param entity 待删除的对象,主键只必须设置.
     * @return
     */ public <T> int delete(T entity){ Object[] args=getPrimarySelectionAndArgs(entity); return db.delete(getTableName(entity),(String)args[],(String[])args[1]); } /**
     * 根据主键从数据库载入一条记录到对象
     * @param entity 数据实体(必须初始化主键字段)
     * @return 成功则返回的该数据库实体,失败则返回NULL
     */ public <T> T loadByPrimaryKey(T entity){ Object[] args=getPrimarySelectionAndArgs(entity); Cursor cursor=db.query(getTableName(entity),null); try{ if(cursor.moveToNext()){ T db_entity=getEntity(cursor,entity); return db_entity; }else{ return null; } }finally{ cursor.close(); } } @SuppressWarnings("unchecked") public <T> List<T> loadAll(T entity,String orderBy){ List<T> entities=new ArrayList<T>(); Cursor cursor=db.query(getTableName(entity),orderBy); try{ if(cursor!=null && cursor.moveToFirst()){ T obj=(T)entity.getClass().newInstance(); getEntity(cursor,obj); entities.add(obj); }while(cursor.moveToNext()); return entities; }catch(Exception e){ Log.e(tag,e); return entities; }finally{ cursor.close(); } } /**
     * 更新数据库实体,包括NULL字段.
     * @param entity 待更新的对象(必须包含主键)
     * @return 成功更新的记录数
     */ public int updateByPrimaryKey(Object entity){ return updateByPrimaryKey(entity,false); } /**
     * 更新数据库实体,对象的NULL字段将被忽略.
     * @param entity 待更新的对象(必须包含主键)
     * @return 成功更新的记录数
     */ public int updateByPrimaryKeySelective(Object entity){ return updateByPrimaryKey(entity,true); } private int updateByPrimaryKey(Object entity,selective); Object[] args=getPrimarySelectionAndArgs(entity); int r=db.update(getTableName(entity),(String[])args[1]); return r; } /**
     * 从对象中解析出主键字段,以及主键字段对应的值 
     * @param entity
     * @return
     */ private Object[] getPrimarySelectionAndArgs(Object entity){ Object[] ret=new Object[2]; String selection=null; List<String> args=new ArrayList<String>(); try{ Class<?> entity_class=entity.getClass(); Field[] fs=entity_class.getDeclaredFields(); for(Field f:fs){ if(isPrimaryKey(f)){ Method get=getGetMethod(entity_class,f); if(get!=null){ Object o=get.invoke(entity); String value=null; if(o!=null){ value=o.toString(); if(selection==null){ selection=f.getName()+"=?"; }else{ selection+=" AND "+f.getName()+"=?"; } args.add(value); }else{ throw new RuntimeException("Primary key: "+f.getName()+" must not be null"); } } } } if(selection==null){ throw new RuntimeException("Primary key not found!"); } ret[]=selection; ret[1]=args.toArray(new String[args.size()]); return ret; }catch(Exception e){ throw new RuntimeException(e.getMessage(),e); } } /**
     * 将对象转换为ContentValues
     * @param entity
     * @param selective
     * @return
     */ private ContentValues getContentValues(Object entity,boolean selective){ ContentValues values=new ContentValues(); try{ Class<?> entity_class=entity.getClass(); Field[] fs=entity_class.getDeclaredFields(); for(Field f:fs){ if(isTransient(f)==false){ Method get=getGetMethod(entity_class,f); if(get!=null){ Object o=get.invoke(entity); if(!selective || (selective && o!=null)){ String name=f.getName(); Class<?> type=f.getType(); if(type==String.class){ values.put(name,(String)o); }else if(type==int.class || type==Integer.class){ values.put(name,(Integer)o); }else if(type==float.class || type==Float.class){ values.put(name,(Float)o); }else if(type==long.class || type==Long.class){ values.put(name,(Long)o); }else if(type==Date.class){ values.put(name,datetimeToString((Date)o)); }else{ values.put(name,o.toString()); } } } } } return values; }catch(Exception e){ throw new RuntimeException(e.getMessage(),e); } } /**
     * 将数据库记录转换为对象
     * 
     * @param cursor
     * @param entity
     * @return
     */ private <T> T getEntity(Cursor cursor,T entity){ try{ Class<?> entity_class=entity.getClass(); Field[] fs=entity_class.getDeclaredFields(); for(Field f:fs){ int index=cursor.getColumnIndex(f.getName()); if(index>=){ Method set=getSetMethod(entity_class,f); if(set!=null){ String value=cursor.getString(index); if(cursor.isNull(index)){ value=null; } Class<?> type=f.getType(); if(type==String.class){ set.invoke(entity,value); }else if(type==int.class || type==Integer.class){ set.invoke(entity,value==null?(Integer)null:Integer.parseInt(value)); }else if(type==float.class || type==Float.class){ set.invoke(entity,value==null?(Float)null:Float.parseFloat(value)); }else if(type==long.class || type==Long.class){ set.invoke(entity,value==null?(Long)null:Long.parseLong(value)); }else if(type==Date.class){ set.invoke(entity,value==null?(Date)null:stringToDateTime(value)); }else{ set.invoke(entity,value); } } } } return entity; }catch(Exception e){ throw new RuntimeException(e.getMessage(),e); } } private String datetimeToString(Date d){ SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); if(d!=null){ return sdf.format(d); } return null; } private Date stringToDateTime(String s){ SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); if(s!=null){ try { return sdf.parse(s); } catch (ParseException e) { Log.e(tag,e); } } return null; } private Method getGetMethod(Class<?> entity_class,Field f){ String fn=f.getName(); String mn="get"+fn.substring(,1).toUpperCase()+fn.substring(1); try{ return entity_class.getDeclaredMethod(mn); }catch(NoSuchMethodException e){ Log.w(tag,"Method: "+mn+" not found."); return null; } } private Method getSetMethod(Class<?> entity_class,Field f){ String fn=f.getName(); String mn="set"+fn.substring(,1).toUpperCase()+fn.substring(1); try{ return entity_class.getDeclaredMethod(mn,f.getType()); }catch(NoSuchMethodException e){ Log.w(tag,"Method: "+mn+" not found."); return null; } } /**
     * 检查是否为主键字段
     */ private boolean isPrimaryKey(Field f){ Annotation an=f.getAnnotation(Id.class); if(an!=null){ return true; } return false; } private boolean isTransient(Field f){ Annotation an=f.getAnnotation(Transient.class); if(an!=null){ return true; } return false; } private String getTableName(Object entity){ Table table=entity.getClass().getAnnotation(Table.class); String name= table.name(); return name; } public int getConflictType() { return conflictType; } public void setConflictType(int conflictType) { this.conflictType = conflictType; } } 
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * @author [email?protected]
 * 
 * 标注为主键字段
 */
@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME) 
public @interface Id {

}

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * @author [email?protected]
 * 
 *  标注数据库表名
 */
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME) 
public @interface  Table {
    /**
     * @return 数据库表名
     */
    String name();
}

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * @author [email?protected]
 * 
 * 标注为非数据库字段
 */
@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME) 
public @interface Transient {

}

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