85 lines
1.7 KiB
C
85 lines
1.7 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include "sqlite3.h"
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static void count_table(sqlite3 *db) {
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int rc;
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char * sql = "select * from t;";
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sqlite3_stmt *stmt = NULL;
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int nrows = 0;
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rc = sqlite3_prepare_v2(db, sql, -1, &stmt, NULL);
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while (SQLITE_ROW == sqlite3_step(stmt)) {
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nrows++;
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}
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printf("Number of rows: %d\n", nrows);
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}
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int main(int argc, char const *argv[]) {
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sqlite3 *db;
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char * err_msg = 0;
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int rc = sqlite3_open("test.db", &db);
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if (rc != SQLITE_OK) {
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fprintf(stderr, "Cannot open database: %s\n", sqlite3_errmsg(db));
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sqlite3_close(db);
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return 1;
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}
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char *sql =
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"DROP TABLE IF EXISTS t;"
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"CREATE TABLE t(id BIGINT);";
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rc = sqlite3_exec(db, sql, 0, 0, &err_msg);
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if (rc != SQLITE_OK) {
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fprintf(stderr, "SQL error: %s\n", err_msg);
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sqlite3_free(err_msg);
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sqlite3_close(db);
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return 1;
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}
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{
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// Write a lot of data
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int nrows = 1000;
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int batch = 100;
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char tsql[1024];
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int v = 0;
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// sqlite3_exec(db, "PRAGMA journal_mode=WAL;", 0, 0, &err_msg);
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sqlite3_exec(db, "PRAGMA read_uncommitted=true;", 0, 0, &err_msg);
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for (int k = 0; k < nrows / batch; k++) {
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sqlite3_exec(db, "begin;", 0, 0, &err_msg);
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for (int i = 0; i < batch; i++) {
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v++;
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sprintf(tsql, "insert into t values (%d)", v);
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rc = sqlite3_exec(db, tsql, 0, 0, &err_msg);
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if (rc != SQLITE_OK) {
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fprintf(stderr, "SQL error: %s\n", err_msg);
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sqlite3_free(err_msg);
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sqlite3_close(db);
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return 1;
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}
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}
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count_table(db);
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sqlite3_exec(db, "commit;", 0, 0, &err_msg);
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}
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}
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sqlite3_close(db);
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return 0;
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}
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