From 816f1ab962d74feeea2cf21ad75a90addd0ed92e Mon Sep 17 00:00:00 2001
From: Alexander Popov <iiiypuk@fastmail.fm>
Date: Sat, 11 Jun 2022 02:14:49 +0300
Subject: [PATCH] add sqlite3 C examples

---
 ~/C/README.md        |  9 ++++++++
 ~/C/sqlite3_create.c | 52 +++++++++++++++++++++++++++++++++++++++++
 ~/C/sqlite3_delete.c | 51 ++++++++++++++++++++++++++++++++++++++++
 ~/C/sqlite3_insert.c | 55 ++++++++++++++++++++++++++++++++++++++++++++
 ~/C/sqlite3_select.c | 50 ++++++++++++++++++++++++++++++++++++++++
 ~/C/sqlite3_update.c | 51 ++++++++++++++++++++++++++++++++++++++++
 6 files changed, 268 insertions(+)
 create mode 100644 ~/C/README.md
 create mode 100644 ~/C/sqlite3_create.c
 create mode 100644 ~/C/sqlite3_delete.c
 create mode 100644 ~/C/sqlite3_insert.c
 create mode 100644 ~/C/sqlite3_select.c
 create mode 100644 ~/C/sqlite3_update.c

diff --git a/~/C/README.md b/~/C/README.md
new file mode 100644
index 0000000..32e8cbc
--- /dev/null
+++ b/~/C/README.md
@@ -0,0 +1,9 @@
+# C
+
+## SQLite 3
+
+- [CREATE TABLE](sqlite3_create.c)
+- [INSERT INTO](sqlite3_insert.c)
+- [SELECT](sqlite3_select.c)
+- [UPDATE](sqlite3_update.c)
+- [DELETE](sqlite3_delete.c)
diff --git a/~/C/sqlite3_create.c b/~/C/sqlite3_create.c
new file mode 100644
index 0000000..df137a1
--- /dev/null
+++ b/~/C/sqlite3_create.c
@@ -0,0 +1,52 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sqlite3.h>
+
+static int callback(void *NotUsed, int argc, char **argv, char **azColName) {
+    int i;
+    for(i = 0; i<argc; i++) {
+        printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
+    }
+
+    printf("\n");
+    return 0;
+}
+
+int main(int argc, char* argv[]) {
+    sqlite3 *db;
+    char *zErrMsg = 0;
+    int rc;
+    char *sql;
+
+    /* Open database */
+    rc = sqlite3_open("test.db", &db);
+
+    if (rc) {
+        fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
+        return(0);
+    } else {
+        fprintf(stdout, "Opened database successfully\n");
+    }
+
+    /* 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 */
+    rc = sqlite3_exec(db, sql, callback, 0, &zErrMsg);
+
+    if (rc != SQLITE_OK) {
+        fprintf(stderr, "SQL error: %s\n", zErrMsg);
+        sqlite3_free(zErrMsg);
+    } else {
+        fprintf(stdout, "Table created successfully\n");
+    }
+
+    sqlite3_close(db);
+
+    return 0;
+}
diff --git a/~/C/sqlite3_delete.c b/~/C/sqlite3_delete.c
new file mode 100644
index 0000000..588019f
--- /dev/null
+++ b/~/C/sqlite3_delete.c
@@ -0,0 +1,51 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sqlite3.h>
+
+static int callback(void *data, int argc, char **argv, char **azColName) {
+    int i;
+    fprintf(stderr, "%s: ", (const char*)data);
+
+    for (i = 0; i<argc; i++) {
+        printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
+    }
+
+    printf("\n");
+    return 0;
+}
+
+int main(int argc, char* argv[]) {
+    sqlite3 *db;
+    char *zErrMsg = 0;
+    int rc;
+    char *sql;
+    const char* data = "Callback function called";
+
+    /* Open database */
+    rc = sqlite3_open("test.db", &db);
+
+    if (rc) {
+        fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
+        return(0);
+    } else {
+        fprintf(stderr, "Opened database successfully\n");
+    }
+
+    /* Create merged SQL statement */
+    sql = "DELETE from COMPANY where ID=2; " \
+        "SELECT * from COMPANY";
+
+    /* Execute SQL statement */
+    rc = sqlite3_exec(db, sql, callback, (void*)data, &zErrMsg);
+
+    if (rc != SQLITE_OK) {
+        fprintf(stderr, "SQL error: %s\n", zErrMsg);
+        sqlite3_free(zErrMsg);
+    } else {
+        fprintf(stdout, "Operation done successfully\n");
+    }
+
+    sqlite3_close(db);
+
+    return 0;
+}
diff --git a/~/C/sqlite3_insert.c b/~/C/sqlite3_insert.c
new file mode 100644
index 0000000..e2cb5d3
--- /dev/null
+++ b/~/C/sqlite3_insert.c
@@ -0,0 +1,55 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sqlite3.h>
+
+static int callback(void *NotUsed, int argc, char **argv, char **azColName) {
+    int i;
+    for (i = 0; i<argc; i++) {
+        printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
+    }
+
+    printf("\n");
+
+    return 0;
+}
+
+int main(int argc, char* argv[]) {
+    sqlite3 *db;
+    char *zErrMsg = 0;
+    int rc;
+    char *sql;
+
+    /* Open database */
+    rc = sqlite3_open("test.db", &db);
+
+    if (rc) {
+        fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
+        return(0);
+    } else {
+        fprintf(stderr, "Opened database successfully\n");
+    }
+
+    /* 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 */
+    rc = sqlite3_exec(db, sql, callback, 0, &zErrMsg);
+
+    if (rc != SQLITE_OK) {
+        fprintf(stderr, "SQL error: %s\n", zErrMsg);
+        sqlite3_free(zErrMsg);
+    } else {
+        fprintf(stdout, "Records created successfully\n");
+    }
+
+    sqlite3_close(db);
+
+    return 0;
+}
diff --git a/~/C/sqlite3_select.c b/~/C/sqlite3_select.c
new file mode 100644
index 0000000..fb8390e
--- /dev/null
+++ b/~/C/sqlite3_select.c
@@ -0,0 +1,50 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sqlite3.h>
+
+static int callback(void *data, int argc, char **argv, char **azColName) {
+    int i;
+    fprintf(stderr, "%s: ", (const char*)data);
+
+    for (i = 0; i<argc; i++) {
+        printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
+    }
+
+    printf("\n");
+    return 0;
+}
+
+int main(int argc, char* argv[]) {
+    sqlite3 *db;
+    char *zErrMsg = 0;
+    int rc;
+    char *sql;
+    const char* data = "Callback function called";
+
+    /* Open database */
+    rc = sqlite3_open("test.db", &db);
+
+    if (rc) {
+        fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
+        return(0);
+    } else {
+        fprintf(stderr, "Opened database successfully\n");
+    }
+
+    /* Create SQL statement */
+    sql = "SELECT * from COMPANY";
+
+    /* Execute SQL statement */
+    rc = sqlite3_exec(db, sql, callback, (void*)data, &zErrMsg);
+
+    if (rc != SQLITE_OK) {
+        fprintf(stderr, "SQL error: %s\n", zErrMsg);
+        sqlite3_free(zErrMsg);
+    } else {
+        fprintf(stdout, "Operation done successfully\n");
+    }
+
+    sqlite3_close(db);
+
+    return 0;
+}
diff --git a/~/C/sqlite3_update.c b/~/C/sqlite3_update.c
new file mode 100644
index 0000000..5f9fe01
--- /dev/null
+++ b/~/C/sqlite3_update.c
@@ -0,0 +1,51 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sqlite3.h>
+
+static int callback(void *data, int argc, char **argv, char **azColName) {
+    int i;
+    fprintf(stderr, "%s: ", (const char*)data);
+
+    for(i = 0; i<argc; i++) {
+        printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
+    }
+
+    printf("\n");
+    return 0;
+}
+
+int main(int argc, char* argv[]) {
+    sqlite3 *db;
+    char *zErrMsg = 0;
+    int rc;
+    char *sql;
+    const char* data = "Callback function called";
+
+    /* Open database */
+    rc = sqlite3_open("test.db", &db);
+
+    if (rc) {
+        fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
+        return(0);
+    } else {
+        fprintf(stderr, "Opened database successfully\n");
+    }
+
+    /* Create merged SQL statement */
+    sql = "UPDATE COMPANY set SALARY = 25000.00 where ID=1; " \
+        "SELECT * from COMPANY";
+
+    /* Execute SQL statement */
+    rc = sqlite3_exec(db, sql, callback, (void*)data, &zErrMsg);
+
+    if (rc != SQLITE_OK) {
+        fprintf(stderr, "SQL error: %s\n", zErrMsg);
+        sqlite3_free(zErrMsg);
+    } else {
+        fprintf(stdout, "Operation done successfully\n");
+    }
+
+    sqlite3_close(db);
+
+    return 0;
+}