Db browser for sqlite select syntax error

#Db browser for sqlite select syntax error update

Int result = SQLite3_ prepare_ v2(sql, sqlSentence, -1, &stmt, NULL) - 1 means that the system will automatically calculate the length of the SQL statement prepare for insertion - check the validity of the statement SQLite3_ stmt *stmt = NULL // Stmt statement handle

#Db browser for sqlite select syntax error update

(executing update and delete statements is basically similar to executing create table and add statements, just change the SQL statement.)Д¬onst char * sqlsense = 'insert into t_person (name, age) values ('xia Ming ', 22) '// SQL statement Execute SQL statements that do not return data (add, delete, modify). STD:: clog <<'open database connection failed' ДЈ. STD:: clog <<'open database connection succeeded' Int result = sqlite3_ open_ v2(path, &sql, SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE | SQLITE_OPEN_NOMUTEX | SQLITE_OPEN_SHAREDCACHE, NULL)

the path of the database file must be passed in as a C string. If the database does not exist, it is created. open the database connection according to the file path. Sqlite3 *sql = NULL // An open database instanceД¬onst char * path = './test. (the specific steps are not mentioned here, please refer to the web page) Order by: select * from table name order by field (ascending by default) Select * from table name order by field desc (descending order) Select * from table name order by field ASC (ascending order) Select * from table name order by field 1 ASC (in ascending order of field 1), field 2 desc (in descending order of field 2) Where: where field = a value The where field is a value Where field! = A certain value The where field is not a value Where field> a value Where field 1 = a value 1 and field 2 a value 2 SELECT count(*) FROM t_ person ren WHERE ren.age> 80 delete the record with the field age equal to 25 in the table.ДELETE FROM t_ person WHERE age> 12 AND age 80 AND nianling 80 change the value of the name field in the table to Xiaoming's age value to 12Дelete data in the table delete: delete from table name Delete from table name where = field value. UPDATE t_ Person set age = 12 Where name = 'Xiao Ming' change all the values of the name field and the age field in the table to Xiaoming and 10 respectively. UPDATE t_ Person set name = 'Xiao Ming', age = 10 Modify the data in the table вџ№ update: update table name set field 1 = the value of field 1, field 2 = the value of field 2. INSERT INTO t_ Person (name, age) values ('daming ', 22) you cannot use keywords to name tables and fields in the database.Дata definition statement (DDL: Data Definition Language)Д¬reate a new table вџ№ create: create table table name (field name 1, field type 1, field name 2, field type 2,) Create table if not exists table name (field name 1, field type 1, field name 2, field type 2) Д¬REATE TABLE IF NOT EXISTS t_ person (id integer PRIMARY KEY AUTOINCREMENT, name text NOT NULL, age integer NOT NULL) Дelete the table drop: dorp table name Drop table if exists table name Дata manipulation statement (DML: Data Manipulation Language)ДЄdd data in the table вџ№ insert: insert into table name (field 1, field 2, etc.) values (value of field 1, value of field 2) The string contents are in single quotes. Keywords: select, insert, update, delete, from, create, where, DESC, order, by, group, table, alter, view, index, etc.

SQL (Structured Query Language) statementДЇeatures: case insensitive, and each statement ends with вЂњ вЂќ. When we access the database with C/C++, we need to save the SQL statement with char* or C string, then call the function of the corresponding SQLite3 library, and import the C string to execute the SQL instruction. The SQL statement is the instruction of SQL operation. It is just a file and does not need a server process. It is specially used for appropriate data access on mobile devices. SQLite3 is just a lightweight embedded database engine, which occupies very low resources and processes faster than mysql.