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再所有操作之前先添加libsqlite这个库以及引入sqlite3.h头文件
一，创建数据库打开数据库，关闭数据库
NSString *sqlPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject]; sqlPath = [_sqlPath stringByAppendingPathComponent:@"students.sqlite"]; sqlite3 *sql; int result = sqlite3_open(self.sqlPath.UTF8String, &sql); if(result == SQLITE_OK) { NSLog(@"打开数据库成功"); self.sql = sql; return YES; } NSLog(@"打开数据库失败");
sqlite3 *sql = self.sql;
if(sqlite3_close(sql) == SQLITE_OK){
NSLog(@"关闭数据库成功");
return YES;
}
二、插入数据
拼接语句
[self openDataBase];
NSString *sqlString = [NSString stringWithFormat:@"insert into t_student(name) values(‘毛小东‘)"];
sqlite3 *sql = self.sql;
char *error;
int result = sqlite3_exec(sql, sqlString.UTF8String,NULL, NULL, &error);
if(result == SQLITE_OK)
NSLog(@"插入成功");
[self closeDataBase];
暂位符方式
NSString *sqlString = @"insert into t_student(name) values(?)";
sqlite3_stmt *stmt;
int result = sqlite3_prepare_v2(self.sql, sqlString.UTF8String, -1, &stmt, NULL);
if(result == SQLITE_OK){
sqlite3_bind_text(stmt, 1, [NSString stringWithFormat:@"叶衍宏"].UTF8String, -1, NULL);
}
int resultInsert = sqlite3_step(stmt);
if(resultInsert == SQLITE_DONE)
NSLog(@"插入成功");
[self closeDataBase];
二，查询
[self openDataBase];
NSString *sqlString = [NSString stringWithFormat:@"select id,name from t_student"];
sqlite3_stmt *stmt;
int result = sqlite3_prepare_v2(self.sql, sqlString.UTF8String, -1, &stmt, NULL);
if(result == SQLITE_OK){
while (sqlite3_step(stmt) == SQLITE_ROW) {
int studentId = sqlite3_column_int(stmt, 0);
NSString *studentName = [NSString stringWithCString:(const char *)sqlite3_column_text(stmt, 1) encoding:NSUTF8StringEncoding];
NSLog(@"ID = %d 姓名 = %@",studentId,studentName);
}
}
sqlite3_finalize(stmt);
[self closeDataBase];
三，删除
[self openDataBase];
NSString *sqlString = [NSString stringWithFormat:@"delete from t_student where id = 5"];
char *error;
int result = sqlite3_exec(self.sql, sqlString.UTF8String, NULL, NULL, &error);
if(result == SQLITE_OK)
NSLog(@"成功");
[self closeDataBase];
四，更改
[self openDataBase];
NSString *sqlString = [NSString stringWithFormat:@"update t_student set name = ‘毛茸茸‘ where id = 3"];
char *error;
int result = sqlite3_exec(self.sql, sqlString.UTF8String, NULL, NULL, &error);
if(result == SQLITE_OK)
NSLog(@"修改成功");
[self closeDataBase];
五，常用方法
//打开数据库函数，
SQLITE_API int SQLITE_STDCALL sqlite3_open(
const char *filename, /* Database filename (UTF-8) *///数据库文件路径
sqlite3 **ppDb /* OUT: SQLite db handle */ //数据库句柄
);
//关闭数据库
SQLITE_API int SQLITE_STDCALL sqlite3_close(sqlite3*);
//执行SQL语句，可以执行增删查改等操作，不过一般不拿来执行查操作，因为返回不是所查询的数据
SQLITE_API int SQLITE_STDCALL sqlite3_exec(
sqlite3*, /* An open database *///数据库句柄
const char *sql, /* SQL to be evaluated *///SQL语句
int (*callback)(void*,int,char**,char**), /* Callback function *///执行完毕回调
void *, /* 1st argument to callback *///回调block第一个参数
char **errmsg /* Error msg written here *///错误信息
);
//检查SQL语句
SQLITE_API int SQLITE_STDCALL sqlite3_prepare_v2(
sqlite3 *db, /* Database handle */ //数据库句柄
const char *zSql, /* SQL statement, UTF-8 encoded */ // SQL语句
int nByte, /* Maximum length of zSql in bytes. */ SQL语句最大长度，-1为不检查
sqlite3_stmt **ppStmt, /* OUT: Statement handle */ sqlite3_stmt 实例，可以获取数据
const char **pzTail /* OUT: Pointer to unused portion of zSql */
);
DEMO:http://pan.baidu.com/s/1mhdPQp6
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原文地址：http://www.cnblogs.com/HeiNeiKu/p/5260093.html
