106 lines
2.8 KiB
Plaintext
106 lines
2.8 KiB
Plaintext
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/*
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An API demo of sqlite3
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author: Ady Liu
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email: imxylz@gmail.com
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web: http://www.blogjava.net/xylz/archive/2012/09/25/388519.html
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*/
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#include <stdio.h>
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#include <string.h>
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#include <sqlite3.h>
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int print_record(void *,int,char **,char **);
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int main(void){
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const char *sql_drop_table="drop table if exists t";
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const char *sql_create_table="create table t(id int primary key,msg varchar(128))";
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char *errmsg = 0;
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int ret = 0;
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int i = 0;
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sqlite3_stmt *stmt;
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char ca[255];
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char **dbresult;
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int j,nrow,ncolumn,index;
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sqlite3 *db = 0;
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ret = sqlite3_open("./sqlite3-demo.db",&db);
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if(ret != SQLITE_OK){
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fprintf(stderr,"Cannot open db: %s\n",sqlite3_errmsg(db));
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return 1;
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}
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printf("Open database\n");
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ret = sqlite3_exec(db,sql_drop_table,NULL,NULL,&errmsg);
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if(ret != SQLITE_OK){
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fprintf(stderr,"drop table fail: %s\n",errmsg);
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}
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ret &= sqlite3_exec(db,sql_create_table,NULL,NULL,&errmsg);
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if(ret != SQLITE_OK){
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fprintf(stderr,"create table fail: %s\n",errmsg);
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}
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ret = sqlite3_exec(db,"insert into t(id,msg) values(1,'Ady Liu')",NULL,NULL,&errmsg);
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printf("Insert a record %s\n",ret == SQLITE_OK ? "OK":"FAIL");
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ret = sqlite3_exec(db,"insert into t(id,msg) values(2,'IMXYLZ')",NULL,NULL,&errmsg);
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printf("Insert a record %s\n",ret == SQLITE_OK ? "OK":"FAIL");
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ret = sqlite3_exec(db,"delete from t where id < 3",NULL,NULL,&errmsg);
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printf("Delete records: %s\n",ret == SQLITE_OK ? "OK":"FAIL");
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//prepare statement
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sqlite3_prepare_v2(db,"insert into t(id,msg) values(?,?)",-1,&stmt,0);
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for(i=10;i<20;i++){
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sprintf(ca,"HELLO#%i",i);
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sqlite3_bind_int(stmt,1,i);
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sqlite3_bind_text(stmt,2,ca,strlen(ca),SQLITE_STATIC);
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sqlite3_step(stmt);
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sqlite3_reset(stmt);
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}
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sqlite3_finalize(stmt);
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//select data
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ret = sqlite3_exec(db,"select * from t",print_record,NULL,&errmsg);
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if(ret != SQLITE_OK){
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fprintf(stderr,"query SQL error: %s\n",errmsg);
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}
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sqlite3_exec(db,"update t set msg='MESSAGE#10' where id=10",NULL,NULL,&errmsg);
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//select table
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ret = sqlite3_get_table(db,"select * from t",&dbresult,&nrow,&ncolumn,&errmsg);
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if(ret == SQLITE_OK){
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printf("query %i records.\n",nrow);
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index=ncolumn;
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for(i=0;i<nrow;i++){
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printf("[%2i]",i);
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for(j=0;j<ncolumn;j++){
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printf(" %s",dbresult[index]);
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index++;
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}
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printf("\n");
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}
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}else{
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fprintf(stderr,"query with get_table error: %s\n",errmsg);
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}
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sqlite3_free_table(dbresult);
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ret = sqlite3_exec(db,"delete from t",NULL,NULL,&errmsg);
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if(ret == SQLITE_OK){
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printf("delete records: %i\n",sqlite3_changes(db));
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}
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sqlite3_free(errmsg);
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sqlite3_close(db);
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printf("Close database\n");
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return 0;
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}
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int print_record(void * params,int n_column,char **column_value,char **column_name){
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int i;
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for(i=0;i<n_column;i++){
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printf("\t%s",column_value[i]);
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}
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printf("\n");
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return 0;
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}
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