最后一节,这里记录下如何删除数据。
前面所有的代码都继承在这里了,在Ubuntu14.04和Mac10.9上亲测通过。
#include <stdio.h> #include <stdlib.h> #include "sqlite/sqlite3.h" #define DB_NANE "sqlite/test.db" sqlite3 *db = NULL; char* sql = NULL; char *zErrMsg = NULL; const char* data = "Callback function called"; int ret = 0; typedef enum{ false, true } bool; /* typedef int (*sqlite3_callback)( void*, Data provided in the 4th argument of sqlite3_exec() int, The number of columns in row char**, An array of strings representing fields in the row char** An array of strings representing column names ); */ static int callback(void *NotUsed, int argc, char **argv, char **azColName) { int i = 0; for(i=0; i < argc; i++){ printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL"); } printf("\n"); return 0; } bool connectDB() { ret = sqlite3_open(DB_NANE, &db); if( ret != SQLITE_OK){ fprintf(stderr, "Error open database: %s\n", sqlite3_errmsg(db)); sqlite3_free(zErrMsg); return false; } fprintf(stdout, "Successfully opened database\n"); return true; } bool createTable() { /* Create SQL statement */ sql = "CREATE TABLE COMPANY(" "ID INT PRIMARY KEY NOT NULL," "NAME TEXT NOT NULL," "AGE INT NOT NULL," "ADDRESS CHAR(50)," "SALARY REAL );"; /* Execute SQL statement */ ret = sqlite3_exec(db, sql, callback, 0, &zErrMsg); if( ret != SQLITE_OK ){ fprintf(stderr, "Error SQL: %s\n", zErrMsg); sqlite3_free(zErrMsg); return false; } fprintf(stdout, "Successfully table created\n"); return true; } bool insertRecords() { /* Create SQL statement */ sql = "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) " "VALUES (1, 'Paul', 32, 'California', 20000.00 ); " "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) " "VALUES (2, 'Allen', 25, 'Texas', 15000.00 ); " "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY)" "VALUES (3, 'Teddy', 23, 'Norway', 20000.00 );" "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY)" "VALUES (4, 'Mark', 25, 'Rich-Mond ', 65000.00 );"; /* Execute SQL statement */ ret = sqlite3_exec(db, sql, callback, 0, &zErrMsg); if( ret != SQLITE_OK ){ fprintf(stderr, "SQL error: %s\n", zErrMsg); sqlite3_free(zErrMsg); return false; } fprintf(stdout, "successfully records created\n"); return true; } bool selectFromTable() { /* Create SQL statement */ sql = "SELECT * from COMPANY"; /* Execute SQL statement */ ret = sqlite3_exec(db, sql, callback, (void*)data, &zErrMsg); if( ret != SQLITE_OK ){ fprintf(stderr, "Error SQL: %s\n", zErrMsg); sqlite3_free(zErrMsg); return false; } fprintf(stdout, "successfully operation done\n"); return true; } bool updateTable() { /* Create merged SQL statement */ sql = "UPDATE COMPANY set SALARY = 25000.00 where ID=1; " "SELECT * from COMPANY"; /* Execute SQL statement */ ret = sqlite3_exec(db, sql, callback, (void*)data, &zErrMsg); if( ret != SQLITE_OK ){ fprintf(stderr, "SQL error: %s\n", zErrMsg); sqlite3_free(zErrMsg); return false; } fprintf(stdout, "Successfully operation done \n"); return true; } bool deleteTable()/*新加*/ { /* Create merged SQL statement */ sql = "DELETE from COMPANY where ID=2; " "SELECT * from COMPANY"; /* Execute SQL statement */ ret = sqlite3_exec(db, sql, callback, (void*)data, &zErrMsg); if( ret != SQLITE_OK ){ fprintf(stderr, "Error SQL: %s\n", zErrMsg); sqlite3_free(zErrMsg); return false; } fprintf(stdout, "Successfully operation done\n"); return true; } bool closeDB() { int ret = 0; ret = sqlite3_close(db); if ( ret == SQLITE_BUSY ){ return false; } return true; } int main(int argc, char* argv[]) { connectDB(); /*createTable();*/ /*insertRecords();*/ selectFromTable(); /*updateTable();*/ deleteTable(); selectFromTable(); closeDB(); return 0; }