整理旧资料，收拾新东西，有些db状态不是mysql客户端能模拟出来的，所以记录下打样过程，如果以后有需要也不用从头看起
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#include <stdio.h> #include <stdlib.h> #include <string.h> #include <mysql/mysql.h> MYSQL *conn; void print_err() { fprintf(stderr, "%d %s", mysql_errno(conn),mysql_error(conn)); } void init_db() { conn = mysql_init(NULL); if(conn == NULL) { fprintf(stderr, "mysql_init() failed"); exit(EXIT_FAILURE); } mysql_real_connect(conn, "192.168.1.10", "test1234", "test1234", "db1", 3306, NULL, 0); } void query(char* sql, char* param1) { int ret = -1; MYSQL_STMT *stmt; MYSQL_BIND bind[1]; long length; stmt = mysql_stmt_init(conn); if(conn == NULL) { fprintf(stderr, "mysql_stmt_init() failed\n"); exit(EXIT_FAILURE); } ret = mysql_stmt_prepare(stmt, sql, strlen(sql)); if(ret != 0) { fprintf(stderr, "mysql_stmt_prepare() failed\n"); print_err(); exit(EXIT_FAILURE); mysql_stmt_execute(stmt); }else{ fprintf(stdout, "mysql_stmt_prepare() success\n"); } if(mysql_stmt_reset(stmt)) { fprintf(stderr, "mysql_stmt_reset() failed\n"); print_err(); }else{ fprintf(stdout, "mysql_stmt_reset() success\n"); } ret = mysql_stmt_prepare(stmt, sql, strlen(sql)); if(ret != 0) { fprintf(stderr, "mysql_stmt_prepare() failed\n"); print_err(); exit(EXIT_FAILURE); mysql_stmt_execute(stmt); }else{ fprintf(stdout, "mysql_stmt_prepare() success\n"); } memset(bind, 0, sizeof(bind)); /*普通bind*/ bind[0].buffer_type = MYSQL_TYPE_STRING; bind[0].buffer = (char *)param1; bind[0].buffer_length = strlen(param1); ret = mysql_stmt_bind_param(stmt, bind); if(ret != 0) { fprintf(stderr, "mysql_stmt_bind_param() failed\n"); exit(EXIT_FAILURE); mysql_stmt_execute(stmt); }else{ fprintf(stdout, "mysql_stmt_bind_param() success\n"); } /*发送long data*/ // bind[0].buffer_type= MYSQL_TYPE_STRING; // bind[0].length= &length; // bind[0].is_null= 0; // ret = mysql_stmt_bind_named_param(stmt, bind, 1, NULL); // if(ret != 0) // { // fprintf(stderr, "mysql_stmt_bind_named_param() failed\n"); // print_err(); // }else{ // fprintf(stdout, "mysql_stmt_bind_named_param() success\n"); // } if(mysql_stmt_send_long_data(stmt,0,"MySQL",5)) { fprintf(stderr, "mysql_stmt_send_long_data() failed\n"); print_err(); }else{ fprintf(stdout, "mysql_stmt_send_long_data() success\n"); } if(mysql_stmt_send_long_data(stmt,0," - The most popular Open Source database",40)) { fprintf(stderr, "mysql_stmt_send_long_data() failed\n"); print_err(); }else{ fprintf(stdout, "mysql_stmt_send_long_data() success\n"); } /***/ ret = mysql_stmt_execute(stmt); if(ret != 0) { fprintf(stderr, "mysql_stmt_execute() failed\n"); print_err(); }else{ fprintf(stdout, "mysql_stmt_execute() success\n"); } mysql_stmt_close(stmt); } void close_db() { mysql_close(conn); } int main() { init_db(); query("select md5(?) from dual", "123"); close_db(); } /* gcc -o foo mysql_c_demo.c -I/home/mysql8/mysql8.0.22_run/include -L/home/mysql8/mysql8.0.22_run/lib -lmysqlclient */ |