1 #import <sqlite3.h>
 2
 3 @interface ViewController ()
 4
 5 @property (assign,nonatomic)sqlite3 * database;
 6
 7 @end
 8
 9 @implementation ViewController
10
11 @synthesize database;

 1     //把文本框转换成C语言
 2     const char * name = [_text1.text UTF8String];//名字
 3     const char * age = [_text2.text UTF8String];//年龄
 4     //增加一行语句
 5     char * sql = "insert into t_student (name, age) values (?,?)";
 6     /**
 7      sqlite 操作二进制数据需要用一个辅助的数据类型：sqlite3_stmt * 。
 8      这个数据类型 记录了一个“sql语句”。为什么我把 “sql语句” 用双引号引起来？因为你可以把 sqlite3_stmt * 所表示的内容看成是 sql语句，但是实际上它不是我们所熟知的sql语句。它是一个已经把sql语句解析了的、用sqlite自己标记记录的内部数据结构。
 9      */
10     sqlite3_stmt * stmt;
11
12     //这里要执行sqlite语句了 (数据库,SQL语句,-1,&stmt,NULL); 增删改查都是用这一句代码
13     //不同的地方就是sql语句的不同,sqlite3_bind_text()中的值不同而已.
14     int result = sqlite3_prepare_v2(database, sql, -1, &stmt, NULL);
15     if (result == SQLITE_OK) {
16         sqlite3_bind_text(stmt, 1, name, -1, NULL);
17         sqlite3_bind_text(stmt, 2, age, -1, NULL);
18     }
19     else {
20         NSLog(@"准备失败");
21     }
22     //检验是否操作完成
23     if (sqlite3_step(stmt) == SQLITE_DONE) {
24         NSLog(@"操作完成");
25     }
26     else {
27         NSLog(@"操作失败");
28     }
29     //每次调用sqlite3_prepare 函数sqlite 会重新开辟sqlite3_stmt空间，
30     //所以在使用同一个sqlite3_stmt 指针再次调用sqlite3_prepare 前
31     //需要调用sqlite3_finalize先释放空间
32     sqlite3_finalize(stmt);

 1  //把文本框转换成C语言
 2     const char * name = "张三";//名字
 3     const char * age = "20";//年龄
 4     //增加一行语句
 5     char * sql = "insert into t_student (name, age) values (?,?)";
 6     sqlite3_stmt * stmt;
 7     int result = sqlite3_prepare_v2(database, sql, -1, &stmt, NULL);
 8     if (result == SQLITE_OK) {
 9         sqlite3_bind_text(stmt, 1, name, -1, NULL);
10         sqlite3_bind_text(stmt, 2, age, -1, NULL);
11     }
12     else {
13         NSLog(@"准备失败");
14     }
15     //检验是否操作完成
16     if (sqlite3_step(stmt) == SQLITE_DONE) {
17         NSLog(@"操作完成");
18     }
19     else {
20         NSLog(@"操作失败");
21     }
22     //每次调用sqlite3_prepare 函数sqlite 会重新开辟sqlite3_stmt空间，
23     //所以在使用同一个sqlite3_stmt 指针再次调用sqlite3_prepare 前
24     //需要调用sqlite3_finalize先释放空间
25     sqlite3_finalize(stmt);

 1     int a = [_text1.text intValue];
 2     sqlite3_stmt * stmt;
 3     char * sql = "delete from t_student where id = ?";
 4     int result = sqlite3_prepare_v2(database, sql , -1, &stmt, NULL);
 5     if (result == SQLITE_OK) {
 6         result = sqlite3_bind_int(stmt, 1, a);
 7         if (result == SQLITE_OK) {
 8             result = sqlite3_step(stmt);
 9             if (result == SQLITE_DONE) {
10                 NSLog(@"删除成功");
11             }
12             else {
13                 NSLog(@"删除失败");
14             }
15         }
16     }
17     else {
18         NSLog(@"删除失败");
19     }
20
21     sqlite3_finalize(stmt);

 1    const char * ID = [_text1.text UTF8String];
 2     const char * newname = [_text2.text UTF8String];
 3     sqlite3_stmt * stmt;
 4     char * sql = "update t_student set name = ? where id = ?";
 5     int result = sqlite3_prepare_v2(database, sql , -1, &stmt, NULL);
 6     if (result == SQLITE_OK) {
 7         result = sqlite3_bind_text(stmt, 1, newname, -1, NULL);
 8         result = sqlite3_bind_text(stmt, 2, ID, -1, NULL);
 9         if (result != SQLITE_OK) {
10             NSLog(@"更新数据有问题");
11         }
12         if (sqlite3_step(stmt) != SQLITE_DONE) {
13             NSLog(@"更新数据不成功");
14         }
15     }
16     else {
17         NSLog(@"修改数据失败");
18     }
19     sqlite3_finalize(stmt);

 1 char * sql = "select id , name , age from t_student";
 2     sqlite3_stmt * stmt;
 3     int result = sqlite3_prepare_v2(database, sql , -1, &stmt, NULL);
 4     if (result == SQLITE_OK) {
 5         //sqlite3_step(stmt) == SQLITE_ROW 查询时使用
 6         while (sqlite3_step(stmt) == SQLITE_ROW) {
 7             int ID = sqlite3_column_int(stmt, 0);
 8             char * name = (char *)sqlite3_column_text(stmt, 1);
 9             NSString * strName = [NSString stringWithUTF8String:name];
10             int age = sqlite3_column_int(stmt, 2);
11             NSLog(@"%d,%@,%d",ID,strName,age);
12         }
13     }
14     sqlite3_finalize(stmt);