Qt 数据库创建表失败原因之数据库关键字

标签：

    本人数据库新手，在创建表时出现问题，最后经查证，找出问题所在。下面的程序是部分节选，在创建数据库表的时候，起先使用的L24的CreateDB,经测试，一直输出 Create testResult Fail，

query->isActive()也为false,这就说明问题出在createDB上，也就是说这个QString应该是不符合要求才出错的。后来逐个测试，最后发现是

check varchar(100)的原因，经查看check是数据库关键字。

 1 //创建数据库文件路径
 2 testResultPath = APPDIR + "/TestReport/";
 3     QDir my_dir(testResultPath);
 4     if (!my_dir.exists())
 5         my_dir.mkpath(testResultPath);
 6     testResultPath += "testResult.db";
 7 
 8        //创建数据库
 9     QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
10     //db.setHostName("easybook-3313b0");      //可以省略
11     db.setDatabaseName(testResultPath);
12     //db.setUserName("CETG54th");                //设置数据库用户名，可以省略
13     //db.setPassword("123456");                   //设置数据库密码，可以省略
14     db.open();
15     if (!db.isOpen())
16     {
17         qDebug() << "db is not open";
18         return;
19     }
20 
21 
22      //创建数据库表
23     QSqlQuery *query = new QSqlQuery("", db);
24     //const QString createDB = "create table testResult(id int primary key,testDevice varchar(100),project varchar(100),exc varchar(100),display varchar(100),result varchar(100),time varchar(100),check varchar(100))";      //fail
25     
26     const QString createDB = "create table testResult(id int primary key,testDevice varchar(100),project varchar(100),exc varchar(100),display varchar(100),result varchar(100),time varchar(100),viewInfo varchar(100))";   //success
27     
28     if (query->exec(createDB))
29         qDebug() << "Create testResult Successful";
30     else
31         qDebug() << "Create testResult Fail";
32 
33     qDebug() << query->isActive();

下面罗列了数据库关键字

A
ABSOLUTE ACTION ADD ADMINDB
ALL ALLOCATE ALPHANUMERIC ALTER
AND ANY ARE AS
ASC ASSERTION AT AUTHORIZATION
AUTOINCREMENT AVG

B
BAND BEGIN BETWEEN BINARY
BIT BIT_LENGTH BNOT BOR
BOTH BXOR BY BYTE

C
CASCADE CASCADED CASE CAST
CATALOG CHAR CHARACTER CHAR_LENGTH
CHARACTER_LENGTH CHECK CLOSE COALESCE
COLLATE COLLATION COLUMN COMMIT
COMP COMPRESSION CONNECT CONNECTION
CONSTRAINT CONSTRAINTS CONTAINER CONTINUE
CONVERT CORRESPONDING COUNT COUNTER
CREATE CREATEDB CROSS CURRENCY
CURRENT CURRENT_DATE CURRENT_TIME CURRENT_TIMESTAMP
CURRENT_USER CURSOR

D
DATABASE DATE DATETIME DAY
DEALLOCATE DEC DECIMAL DECLARE
DEFAULT DEFERRABLE DEFERRED DELETE
DESC DESCRIBE DESCRIPTOR DIAGNOSTICS
DISALLOW DISCONNECT DISTINCT DOMAIN
DOUBLE DROP

E
ELSE END END-EXEC ESCAPE
EXCEPT EXCEPTION EXCLUSIVECONNECT EXEC
EXECUTE EXISTS EXTERNAL EXTRACT

F
FALSE FETCH FIRST FLOAT
FLOAT4 FLOAT8 FOR FOREIGN
FOUND FROM FULL

G
GENERAL GET GLOBAL GO
GOTO GRANT GROUP GUID

H
HAVING HOUR

I
IDENTITY IEEEDOUBLE IEEESINGLE IGNORE
IMAGE IMMEDIATE IN INDEX
INDICATOR INHERITABLE INITIALLY INNER
INPUT INSENSITIVE INSERT INT
INTEGER INTEGER1 INTEGER2 INTEGER4
INTERSECT INTERVAL INTO IS
ISOLATION

J
JOIN

K
KEY

L
LANGUAGE LAST LEADING LEFT
LEVEL LIKE LOCAL LOGICAL
LOGICAL1 LONG LONGBINARY LONGCHAR
LONGTEXT LOWER

M
MATCH MAX MEMO MIN
MINUTE MODULE MONEY MONTH

N
NAMES NATIONAL NATURAL NCHAR
NEXT NO NOT NOTE
NULL NULLIF NUMBER NUMERIC

O
OBJECT OCTET_LENGTH OF OLEOBJECT
ON ONLY OPEN OPTION
OR ORDER OUTER OUTPUT
OVERLAPS OWNERACCESS

P
PAD PARAMETERS PARTIAL PASSWORD
PERCENT PIVOT POSITION PRECISION
PREPARE PRESERVE PRIMARY PRIOR
PRIVILEGES PROC PROCEDURE PUBLIC

Q
R
READ REAL REFERENCES RELATIVE
RESTRICT REVOKE RIGHT ROLLBACK
ROWS

S
SCHEMA SCROLL SECOND SECTION
SELECT SELECTSCHEMA SELECTSECURITY SESSION
SESSION_USER SET SHORT SINGLE
SIZE SMALLINT SOME SPACE
SQL SQLCODE SQLERROR SQLSTATE
STRING SUBSTRING SUM SYSTEM_USER

T
TABLE TABLEID TEMPORARY TEXT
THEN TIME TIMESTAMP TIMEZONE_HOUR
TIMEZONE_MINUTE TO TOP TRAILING
TRANSACTION TRANSFORM TRANSLATE TRANSLATION
TRIM TRUE

U
UNION UNIQUE UNIQUEIDENTIFIER UNKNOWN
UPDATE UPDATEIDENTITY UPDATEOWNER UPDATESECURITY
UPPER USAGE USER USING

V
VALUE VALUES VARBINARY VARCHAR
VARYING VIEW

W
WHEN WHENEVER WHERE WITH
WORK WRITE

X
Y
YEAR YESNO

Z
ZONE

     上面的关键字主要转自http://zhidao.baidu.com/link?url=RmJBWdmrnxciebfhmXsiJF3bZzgb1Yw0ywkhugHxcyBLKMixClmJl8pulL-m7sasPaAoUgzPqYFlGyPH5gQ36TJOsn7j_iGHDLAbXbfQrJe

     另外如果使用数据库出现的问题非上述问题，则推荐博客http://www.cnblogs.com/findumars/p/4207133.html，希望有帮助。

Qt 数据库创建表失败原因之数据库关键字

标签：

原文地址：http://www.cnblogs.com/aheng123/p/Qt.html