Unity 初次使用SQLite 数据库
1.所需配置文件
其中 Mono.Data.Sqlite 和System.Data要和你的unity版本相对应，可以在 C：\ Program Files（x86）\ Unity \ Editor \ Data \ Mono \ lib \ mono \ 2.0 *中复制
sqlite3.dll可以在这里下载这些文件http://www.sqlite.org/download.html for Windows
2.注意事项
这个地方要设置成.NET 2.0,不然打包会出错
3.测试脚本
using UnityEngine;
using System.Collections;
using System;
using Mono.Data.Sqlite;
using System.IO;
public class SQLiteHelper
{
///
/// 数据库连接定义
///
private SqliteConnection dbConnection;
///
/// SQL命令定义
///
private SqliteCommand dbCommand;
///
/// 数据读取定义
///
private SqliteDataReader dataReader;
///
/// 构造函数
///
/// 数据库连接字符串
public SQLiteHelper(string connectionString)
{
try
{
//构造数据库连接
dbConnection = new SqliteConnection("data source="+connectionString);
//打开数据库
dbConnection.Open();
}
catch (Exception e)
{
Debug.Log(e.Message);
}
}
///
/// 执行SQL命令
///
///
/// SQL命令字符串
public SqliteDataReader ExecuteQuery(string queryString)
{
dbCommand = dbConnection.CreateCommand();
dbCommand.CommandText = queryString;
dataReader = dbCommand.ExecuteReader();
return dataReader;
}
///
/// 关闭数据库连接
///
public void CloseConnection()
{
//销毁Command
if (dbCommand != null)
{
dbCommand.Cancel();
}
dbCommand = null;
//销毁Reader
if (dataReader != null)
{
dataReader.Close();
}
dataReader = null;
//销毁Connection
if (dbConnection != null)
{
dbConnection.Close();
}
dbConnection = null;
}
///
/// 读取整张数据表
///
///
/// 数据表名称
public SqliteDataReader ReadFullTable(string tableName)
{
string queryString = "SELECT * FROM " + tableName;
return ExecuteQuery(queryString);
}
///
/// 向指定数据表中插入数据
///
///
/// 数据表名称
/// 插入的数值
public SqliteDataReader InsertValues(string tableName, string[] values)
{
//获取数据表中字段数目
int fieldCount = ReadFullTable(tableName).FieldCount;
//当插入的数据长度不等于字段数目时引发异常
if (values.Length != fieldCount)
{
throw new SqliteException("values.Length!=fieldCount");
}
string queryString = "INSERT INTO " + tableName + " VALUES (" + values[0];
for (int i = 1; i < values.Length; i++)
{
queryString += ", " + values[i];
}
queryString += " )";
return ExecuteQuery(queryString);
}
///
/// 更新指定数据表内的数据
///
///
/// 数据表名称
/// 字段名
/// 字段名对应的数据
/// 关键字
/// 关键字对应的值
public SqliteDataReader UpdateValues(string tableName, string[] colNames, string[] colValues, string key, string operation, string value)
{
//当字段名称和字段数值不对应时引发异常
if (colNames.Length != colValues.Length)
{
throw new SqliteException("colNames.Length!=colValues.Length");
}
string queryString = "UPDATE " + tableName + " SET " + colNames[0] + "=" + colValues[0];
for (int i = 1; i < colValues.Length; i++)
{
queryString += ", " + colNames[i] + "=" + colValues[i];
}
queryString += " WHERE " + key + operation + value;
return ExecuteQuery(queryString);
}
///
/// 删除指定数据表内的数据
///
///
/// 数据表名称
/// 字段名
/// 字段名对应的数据
public SqliteDataReader DeleteValuesOR(string tableName, string[] colNames, string[] operations, string[] colValues)
{
//当字段名称和字段数值不对应时引发异常
if (colNames.Length != colValues.Length || operations.Length != colNames.Length || operations.Length != colValues.Length)
{
throw new SqliteException("colNames.Length!=colValues.Length || operations.Length!=colNames.Length || operations.Length!=colValues.Length");
}
string queryString = "DELETE FROM " + tableName + " WHERE " + colNames[0] + operations[0] + colValues[0];
for (int i = 1; i < colValues.Length; i++)
{
queryString += "OR " + colNames[i] + operations[0] + colValues[i];
}
return ExecuteQuery(queryString);
}
///
/// 删除指定数据表内的数据
///
///
/// 数据表名称
/// 字段名
/// 字段名对应的数据
public SqliteDataReader DeleteValuesAND(string tableName, string[] colNames, string[] operations, string[] colValues)
{
//当字段名称和字段数值不对应时引发异常
if (colNames.Length != colValues.Length || operations.Length != colNames.Length || operations.Length != colValues.Length)
{
throw new SqliteException("colNames.Length!=colValues.Length || operations.Length!=colNames.Length || operations.Length!=colValues.Length");
}
string queryString = "DELETE FROM " + tableName + " WHERE " + colNames[0] + operations[0] + colValues[0];
for (int i = 1; i < colValues.Length; i++)
{
queryString += " AND " + colNames[i] + operations[i] + colValues[i];
}
return ExecuteQuery(queryString);
}
///
/// 创建数据表
///
///
/// 数据表名
/// 字段名
/// 字段名类型
public SqliteDataReader CreateTable(string tableName, string[] colNames, string[] colTypes)
{
string queryString = "CREATE TABLE " + tableName + "( " + colNames[0] + " " + colTypes[0];
for (int i = 1; i < colNames.Length; i++)
{
queryString += ", " + colNames[i] + " " + colTypes[i];
}
queryString += " ) ";
return ExecuteQuery(queryString);
}
///
/// Reads the table.
///
///
/// Table name.
/// Items.
/// Col names.
/// Operations.
/// Col values.
public SqliteDataReader ReadTable(string tableName, string[] items, string[] colNames, string[] operations, string[] colValues)
{
string queryString = "SELECT " + items[0];
for (int i = 1; i < items.Length; i++)
{
queryString += ", " + items[i];
}
queryString += " FROM " + tableName + " WHERE " + colNames[0] + " " + operations[0] + " " + colValues[0];
for (int i = 0; i < colNames.Length; i++)
{
queryString += " AND " + colNames[i] + " " + operations[i] + " " + colValues[0] + " ";
}
return ExecuteQuery(queryString);
}
}
uusing UnityEngine;
using System.Collections;
using System.IO;
using Mono.Data.Sqlite;
using UnityEngine.UI;
public class SQLiteDemo : MonoBehaviour
{
///
/// SQLite数据库辅助类
///
private SQLiteHelper sql;
private string q;
private string qer;
private string qere;
private string qdf;
public Text text;
void Start()
{
string path = "data source=" + Application.streamingAssetsPath + "/DataBase.db";
print("kaishi");
text.text = "kaishi";
try
{
FindDataBase();
while (sql==null)
{
}
}
catch (System.Exception e)
{
text.text = e.Message;
throw;
}
//创建名为sqlite4unity的数据库
if (sql == null)
{
Debug.LogError("sql不能为空");
}
// 创建名为table1的数据表
sql.CreateTable("table1", new string[] { "ID", "Name", "Age", "Email" }, new string[] { "INTEGER", "TEXT", "INTEGER", "TEXT" });
//插入两条数据
sql.InsertValues("table1", new string[] { "'1'", "'张三'", "'22'", "'[email protected]'" });
sql.InsertValues("table1", new string[] { "'2'", "'李四'", "'25'", "'[email protected]'" });
// 更新数据，将Name = "张三"的记录中的Name改为"Zhang3"
sql.UpdateValues("table1", new string[] { "Name" }, new string[] { "'Zhang3'" }, "Name", "=", "'张三'");
// 插入3条数据
sql.InsertValues("table1", new string[] { "3", "'王五'", "25", "'[email protected]'" });
sql.InsertValues("table1", new string[] { "4", "'王五'", "26", "'[email protected]'" });
sql.InsertValues("table1", new string[] { "5", "'王五'", "27", "'[email protected]'" });
//删除Name = "王五"且Age = 26的记录,DeleteValuesOR方法类似
sql.DeleteValuesAND("table1", new string[] { "Name", "Age" }, new string[] { "=", "=" }, new string[] { "'王五'", "'26'" });
// 读取整张表
SqliteDataReader reader = sql.ReadFullTable("table1");
while (reader.Read())
{
q = reader.GetInt32(reader.GetOrdinal("ID")).ToString ();
//读取ID
Debug.Log(reader.GetInt32(reader.GetOrdinal("ID")));
//读取Name
Debug.Log(reader.GetString(reader.GetOrdinal("Name")));
//读取Age
Debug.Log(reader.GetInt32(reader.GetOrdinal("Age")));
//读取Email
Debug.Log(reader.GetString(reader.GetOrdinal("Email")));
text.text+=q;
}
//读取数据表中Age>=25的所有记录的ID和Name
reader = sql.ReadTable("table1", new string[] { "ID", "Name" }, new string[] { "Age" }, new string[] { ">=" }, new string[] { "'25'" });
while (reader.Read())
{
//读取ID
Debug.Log(reader.GetInt32(reader.GetOrdinal("ID")));
//读取Name
Debug.Log(reader.GetString(reader.GetOrdinal("Name")));
}
//自定义SQL,删除数据表中所有Name="王五"的记录
sql.ExecuteQuery("DELETE FROM table1 WHERE NAME='王五'");
//关闭数据库连接
sql.CloseConnection();
}
public Text t;
// Use this for initialization
void FindDataBase()
{
t.text = "数据库内容\r\n";
string appDBPath = Application.persistentDataPath + "/" + "DataBase.db";
//t.text += Application.persistentDataPath + "\r\n";
#if UNITY_EDITOR
LoadData(Application.dataPath + "/StreamingAssets/DataBase.db");
#elif UNITY_ANDROID
if (!File.Exists(appDBPath))
{
StartCoroutine(LoadDatabase(appDBPath));
}
else
{
LoadData(appDBPath);
}
#endif
}
IEnumerator LoadDatabase(string path)
{
string dataPath = "";
#if UNITY_ANDROID
dataPath = "jar:file://" + Application.dataPath + "!/assets/" + "DataBase.db";
#endif
WWW loadDB = new WWW(dataPath);
yield return loadDB;
if (loadDB.isDone)
{
Debug.Log(loadDB.bytes.Length);
File.WriteAllBytes(path, loadDB.bytes);
LoadData(path);
}
}
private void LoadData(string path)
{
sql = new SQLiteHelper(path);
}
}
4.可以使用可视化工具 SQLiteStudio查看编辑db数据库 下载地址链接：http://pan.baidu.com/s/1qYocI9u 密码：mk45