1.SQLITE的常识
SQLite是一个开源免费的数据库，一般用于嵌入系统或者小规模的应用软件开发中，你可以像使用Access一样使用它。
sqlite的主要优点：零配置(Zero Configuration)紧凑（compactness）可移植(Portability)它是运行在Windows,Linux,BSD,Mac OS
X和一些商用Unix系统，比如Sun的Solaris,IBM的AIX，同样，它也可以工作在许多嵌入式操作系统下，比如QNX,VxWorks,Palm
OS, Symbin和Windows CE，尤其对于移动端来说，Sqlite确实是个好东西，废话少说，实战演习。
2.建立Unity sqlite工程 文件结构
将对数据库的操作封装成DbAccess类,代码如下:
DbAccess.cs
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System; 6 using System.Collections; 7 using Mono.Data.Sqlite; 8 9 namespace Assets.Asserts.Scripts 10 { 11 public class DbAccess 12 { 13 14 private SqliteConnection dbConnection; 15 private SqliteCommand dbCommand; 16 private SqliteDataReader reader; 17 18 public DbAccess (string connectionString) 19 { 20 OpenDB (connectionString); 21 } 22 public DbAccess () 23 { 24 25 } 26 27 /// <summary> 28 /// 数据库的打开 29 /// </summary> 30 /// <param name="connectionString"></param> 31 public void OpenDB (string connectionString) 32 { 33 try 34 { 35 dbConnection = new SqliteConnection (connectionString); 36 dbConnection.Open (); 37 } 38 catch(Exception e) 39 { 40 string temp1 = e.ToString(); 41 Console.WriteLine(temp1); 42 } 43 } 44 45 /// <summary> 46 /// 数据库的连接 47 /// </summary> 48 public void CloseSqlConnection () 49 { 50 if (dbCommand != null) 51 { 52 dbCommand.Dispose (); 53 } 54 dbCommand = null; 55 if (reader != null) 56 { 57 reader.Dispose (); 58 } 59 reader = null; 60 if (dbConnection != null) 61 { 62 dbConnection.Close (); 63 } 64 dbConnection = null; 65 } 66 67 /// <summary> 68 /// 语句的执行 69 /// </summary> 70 /// <param name="sqlQuery"></param> 71 /// <returns></returns> 72 public SqliteDataReader ExecuteQuery (string sqlQuery) 73 { 74 dbCommand = dbConnection.CreateCommand (); 75 dbCommand.CommandText = sqlQuery; 76 reader = dbCommand.ExecuteReader (); 77 return reader; 78 79 } 80 81 /// <summary> 82 /// 数据的读取 83 /// </summary> 84 /// <param name="tableName"></param> 85 /// <returns></returns> 86 public SqliteDataReader ReadFullTable (string tableName) 87 { 88 string query = "SELECT * FROM " + tableName; 89 return ExecuteQuery (query); 90 } 91 92 /// <summary> 93 /// 数据的插入 94 /// </summary> 95 /// <param name="tableName"></param> 96 /// <param name="values"></param> 97 /// <returns></returns> 98 public SqliteDataReader InsertInto (string tableName, string[] values) 99 { 100 string query = "INSERT INTO " + tableName + " VALUES ('" + values[0]+"'"; 101 for (int i = 1; i < values.Length; ++i) 102 { 103 query += ",'" + values[i]+"'"; 104 } 105 query += ")"; 106 return ExecuteQuery (query); 107 } 108 109 /// <summary> 110 /// 数据库的更新 111 /// </summary> 112 /// <param name="tableName"></param> 113 /// <param name="cols"></param> 114 /// <param name="colsvalues"></param> 115 /// <param name="selectkey"></param> 116 /// <param name="selectvalue"></param> 117 /// <returns></returns> 118 public SqliteDataReader UpdateInto (string tableName, string []cols,string []colsvalues,string selectkey,string selectvalue) 119 { 120 string query = "UPDATE "+tableName+" SET "+cols[0]+" = "+colsvalues[0]; 121 for (int i = 1; i < colsvalues.Length; ++i) 122 { 123 query += ", " +cols[i]+" ="+ colsvalues[i]; 124 } 125 query += " WHERE "+selectkey+" = "+selectvalue+" "; 126 return ExecuteQuery (query); 127 } 128 129 /// <summary> 130 /// 数据的多删除 131 /// </summary> 132 /// <param name="tableName"></param> 133 /// <param name="cols"></param> 134 /// <param name="colsvalues"></param> 135 /// <returns></returns> 136 public SqliteDataReader Delete(string tableName,string []cols,string []colsvalues) 137 { 138 string query = "DELETE FROM "+tableName + " WHERE " +cols[0] +" = " + colsvalues[0]; 139 for (int i = 1; i < colsvalues.Length; ++i) 140 { 141 query += " or " +cols[i]+" = "+ colsvalues[i]; 142 } 143 return ExecuteQuery (query); 144 } 145 146 /// <summary> 147 /// 数据的单删除 148 /// </summary> 149 /// <param name="tableName"></param> 150 /// <param name="cols"></param> 151 /// <param name="colsvalues"></param> 152 /// <returns></returns> 153 public SqliteDataReader SimpleDelete(string tableName, string cols, string colsvalues) 154 { 155 string query = "DELETE FROM " + tableName + " WHERE " + cols + " = " + colsvalues; 156 return ExecuteQuery(query); 157 } 158 159 /// <summary> 160 /// 条件插入 161 /// </summary> 162 /// <param name="tableName"></param> 163 /// <param name="cols"></param> 164 /// <param name="values"></param> 165 /// <returns></returns> 166 public SqliteDataReader InsertIntoSpecific (string tableName, string[] cols, string[] values) 167 { 168 if (cols.Length != values.Length) 169 { 170 throw new SqliteException ("columns.Length != values.Length"); 171 } 172 string query = "INSERT INTO " + tableName + "(" + cols[0]; 173 for (int i = 1; i < cols.Length; ++i) 174 { 175 query += ", " + cols[i]; 176 } 177 query += ") VALUES (" + values[0]; 178 for (int i = 1; i < values.Length; ++i) 179 { 180 query += ", " + values[i]; 181 } 182 query += ")"; 183 return ExecuteQuery (query); 184 } 185 186 /// <summary> 187 /// 表的删除 188 /// </summary> 189 /// <param name="tableName"></param> 190 /// <returns></returns> 191 public SqliteDataReader DeleteContents (string tableName) 192 { 193 string query = "DELETE FROM " + tableName; 194 return ExecuteQuery (query); 195 } 196 197 /// <summary> 198 /// 表的创建 199 /// </summary> 200 /// <param name="name"></param> 201 /// <param name="col"></param> 202 /// <param name="colType"></param> 203 /// <returns></returns> 204 public SqliteDataReader CreateTable (string name, string[] col, string[] colType) 205 { 206 if (col.Length != colType.Length) 207 { 208 throw new SqliteException ("columns.Length != colType.Length"); 209 } 210 string query = "CREATE TABLE " + name + " (" + col[0] + " " + colType[0]; 211 for (int i = 1; i < col.Length; ++i) 212 { 213 query += ", " + col[i] + " " + colType[i]; 214 } 215 query += ")"; 216 return ExecuteQuery (query); 217 } 218 219 /// <summary> 220 /// 条件查询 221 /// </summary> 222 /// <param name="tableName"></param> 223 /// <param name="items"></param> 224 /// <param name="col"></param> 225 /// <param name="operation"></param> 226 /// <param name="values"></param> 227 /// <returns></returns> 228 public SqliteDataReader SelectWhere (string tableName, string[] items, string[] col, string[] operation, string[] values) 229 { 230 if (col.Length != operation.Length || operation.Length != values.Length) 231 { 232 throw new SqliteException ("col.Length != operation.Length != values.Length"); 233 } 234 string query = "SELECT " + items[0]; 235 for (int i = 1; i < items.Length; ++i) 236 { 237 query += ", " + items[i]; 238 } 239 query += " FROM " + tableName + " WHERE " + col[0] + operation[0] + "'" + values[0] + "' "; 240 for (int i = 1; i < col.Length; ++i) 241 { 242 query += " AND " + col[i] + operation[i] + "'" + values[0] + "' "; 243 } 244 return ExecuteQuery (query); 245 } 246 } 247 }