import

README.md

@@ -1,2 +1,2 @@
 # sqldb
-Generic SQL database access library
+Generic SQL access libradry

go.mod

@@ -0,0 +1,5 @@
+module github.com/redr00m/sqldb
+
+go 1.15
+
+require github.com/lib/pq v1.9.0

go.sum

@@ -0,0 +1,2 @@
+github.com/lib/pq v1.9.0 h1:L8nSXQQzAYByakOFMTwpjRoHsMJklur4Gi59b6VivR8=
+github.com/lib/pq v1.9.0/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=

pg.go

@@ -0,0 +1,281 @@
+package sqldb
+
+import (
+	"database/sql"
+	"fmt"
+	"log"
+	"strconv"
+	"strings"
+
+	"github.com/lib/pq"
+)
+
+var db *sql.DB
+
+// AssRow : associative row type
+type AssRow map[string]interface{}
+
+// Table is a table structure description
+type Table struct {
+	Name    string            `json:"name"`
+	Columns map[string]string `json:"columns"`
+}
+
+// Open the database
+func Open(driver string, url string) {
+	var err error
+	db, err = sql.Open(driver, url)
+	if err != nil {
+		log.Println(err)
+	}
+}
+
+// Close the database connection
+func Close() {
+	db.Close()
+}
+
+// GetAssociativeArray : Provide results as an associative array
+func GetAssociativeArray(table string, columns []string, restriction string, sortkeys []string, dir string) []AssRow {
+	return QueryAssociativeArray(buildSelect(table, "", columns, restriction, sortkeys, dir))
+}
+
+// QueryAssociativeArray : Provide results as an associative array
+func QueryAssociativeArray(query string) []AssRow {
+	rows, err := db.Query(query)
+	if err != nil {
+		log.Println(err)
+		log.Println(query)
+	}
+	defer rows.Close()
+
+	var results []AssRow
+	cols, _ := rows.Columns()
+
+	for rows.Next() {
+		// Create a slice of interface{}'s to represent each column,
+		// and a second slice to contain pointers to each item in the columns slice.
+		columns := make([]interface{}, len(cols))
+		columnPointers := make([]interface{}, len(cols))
+		for i := range columns {
+			columnPointers[i] = &columns[i]
+		}
+
+		// Scan the result into the column pointers...
+		if err := rows.Scan(columnPointers...); err != nil {
+
+		}
+		// Create our map, and retrieve the value for each column from the pointers slice,
+		// storing it in the map with the name of the column as the key.
+		m := make(AssRow)
+		for i, colName := range cols {
+			val := columnPointers[i].(*interface{})
+			m[colName] = *val
+		}
+		// jsonString, _ := json.Marshal(m)
+		// Outputs: map[columnName:value columnName2:value2 columnName3:value3 ...]
+		// fmt.Println(string(jsonString))
+
+		results = append(results, m)
+
+	}
+	return results
+}
+
+// GetSchema : Provide results as an associative array
+func GetSchema(table string) Table {
+	t := Table{Name: table}
+	cols := QueryAssociativeArray("SELECT column_name :: varchar as name, REPLACE(REPLACE(data_type,'character varying','varchar'),'character','char') || COALESCE('(' || character_maximum_length || ')', '') as type from INFORMATION_SCHEMA.COLUMNS where table_name ='" + table + "';")
+	t.Columns = make(map[string]string)
+	for _, row := range cols {
+		var name, rowtype string
+		for key, element := range row {
+			if key == "name" {
+				name = fmt.Sprintf("%v", element)
+			}
+			if key == "type" {
+				rowtype = fmt.Sprintf("%v", element)
+			}
+		}
+		t.Columns[name] = rowtype
+	}
+	return t
+}
+
+func ListTables() []AssRow {
+	return QueryAssociativeArray("SELECT table_name :: varchar FROM information_schema.tables WHERE table_schema = 'public' ORDER BY table_name;")
+}
+
+func CreateTable(t Table) {
+	query := "create table " + t.Name + " ( "
+	columns := ""
+	for name, rowtype := range t.Columns {
+		if fmt.Sprintf("%v", name) == "id" {
+			columns += fmt.Sprintf("%v", name) + " " + "SERIAL PRIMARY KEY,"
+		} else {
+
+			columns += fmt.Sprintf("%v", name) + " " + fmt.Sprintf("%v", rowtype)
+			columns += ","
+		}
+	}
+	query += columns
+	query = query[:len(query)-1] + " )"
+	_, err := db.Query(query)
+	if err != nil {
+		log.Println(query)
+	}
+	query = "create sequence if not exists sq_" + t.Name
+	_, err = db.Query(query)
+	if err != nil {
+		log.Println(query)
+	}
+}
+
+func DeleteTable(table string) {
+	query := "drop table " + table
+	_, err := db.Query(query)
+	if err != nil {
+		log.Println(err)
+	}
+	query = "drop sequence if exists sq_" + table
+	_, err = db.Query(query)
+	if err != nil {
+		log.Println(err)
+	}
+}
+
+func AddColumn(table string, name string, sqltype string) {
+	query := "alter table " + table + " add " + name + " " + sqltype
+	rows, err := db.Query(query)
+	if err != nil {
+		log.Println(err)
+	}
+	defer rows.Close()
+}
+
+func DeleteColumn(table string, name string) {
+	query := "alter table " + table + " drop " + name
+	rows, err := db.Query(query)
+	if err != nil {
+		log.Println(err)
+	}
+	defer rows.Close()
+}
+
+func ListSequences() []AssRow {
+	return QueryAssociativeArray("SELECT sequence_name :: varchar FROM information_schema.sequences WHERE sequence_schema = 'public' ORDER BY sequence_name;")
+}
+
+func buildSelect(table string, key string, columns []string, restriction string, sortkeys []string, dir ...string) string {
+	if key != "" {
+		columns = append(columns, key)
+	}
+	query := "select " + strings.Join(columns, ",") + " from " + table
+	if restriction != "" {
+		query += " where " + restriction
+	}
+	if len(sortkeys) > 0 {
+		query += " order by " + strings.Join(sortkeys, ",")
+	}
+	if len(dir) > 0 {
+		query += " " + dir[0]
+	}
+	return query
+}
+
+func Insert(table string, record AssRow) int {
+	columns := ""
+	values := ""
+	schema := GetSchema(table)
+	var id int
+
+	for key, element := range record {
+
+		if strings.Contains(schema.Columns[key], "char") || strings.Contains(schema.Columns[key], "date") {
+			columns += key + ","
+			values += fmt.Sprintf(pq.QuoteLiteral(fmt.Sprintf("%v", element))) + ","
+		} else {
+
+			columns += key + ","
+			values += fmt.Sprintf("%v", element) + ","
+		}
+	}
+
+	db.QueryRow("INSERT INTO " + table + "(" + removeLastChar(columns) + ") VALUES (" + removeLastChar(values) + ") RETURNING id").Scan(&id)
+	return id
+}
+
+func Update(table string, record AssRow) string {
+
+	schema := GetSchema(table)
+	id := ""
+	stack := ""
+
+	for key, element := range record {
+
+		if strings.Contains(schema.Columns[key], "char") || strings.Contains(schema.Columns[key], "date") {
+
+			stack = stack + " " + key + " = " + pq.QuoteLiteral(fmt.Sprintf("%v", element)) + ","
+
+		} else {
+
+			if key == "id" {
+				id = fmt.Sprintf("%v", element)
+			} else {
+				stack = stack + " " + key + " = " + fmt.Sprintf("%v", element) + ","
+			}
+		}
+	}
+	stack = removeLastChar(stack)
+	query := ("UPDATE " + table + " SET " + stack + " WHERE id = " + id)
+	rows, err := db.Query(query)
+	if err != nil {
+		log.Println(query)
+		log.Println(err)
+	}
+	defer rows.Close()
+	return query
+}
+
+func Delete(table string, record AssRow) string {
+	id := ""
+	values := ""
+
+	for key, element := range record {
+		if key == "id" {
+			values += fmt.Sprintf("%v", element) + ","
+			id = removeLastChar(values)
+
+		}
+	}
+	query := ("DELETE FROM " + table + " WHERE id = " + id)
+	rows, err := db.Query(query)
+	if err != nil {
+		log.Println(query)
+		log.Println(err)
+	}
+	defer rows.Close()
+	return query
+}
+
+func UpdateOrInsert(table string, record AssRow) int {
+	id := 0
+
+	for key, element := range record {
+		if key == "id" {
+			sid := fmt.Sprintf("%v", element)
+			id, _ = strconv.Atoi(sid)
+		}
+	}
+	if id == 0 {
+		return Insert(table, record)
+	} else {
+		Update(table, record)
+		return id
+	}
+}
+
+func removeLastChar(s string) string {
+	r := []rune(s)
+	return string(r[:len(r)-1])
+}

pg_init.sql

@@ -0,0 +1,7 @@
+-- Init on Linux :
+-- 1) login as postgres user : sudo su postgres 
+-- 2) start script : psql -f pg_init.sql
+ 
+CREATE ROLE test WITH PASSWORD 'test' NOSUPERUSER NOCREATEDB NOCREATEROLE INHERIT LOGIN;
+CREATE DATABASE test OWNER test encoding 'UTF8';
+GRANT ALL PRIVILEGES ON DATABASE test TO test;

pg_test.go

@@ -0,0 +1,146 @@
+package sqldb
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"testing"
+)
+
+func TestCreateTable(t *testing.T) {
+	Open("postgres", "host=127.0.0.1 port=5432 user=test password=test dbname=test sslmode=disable")
+	defer Close()
+
+	jsonFile, err := os.Open("test_table.json")
+	if err != nil {
+		fmt.Println(err)
+	}
+	defer jsonFile.Close()
+
+	byteValue, _ := ioutil.ReadAll(jsonFile)
+
+	var data Table
+	json.Unmarshal([]byte(byteValue), &data)
+
+	CreateTable(data)
+
+	tbl := GetSchema(data.Name)
+	if len(tbl.Columns) == 0 {
+		t.Errorf("Create table failed")
+	}
+}
+
+func TestAddColumn(t *testing.T) {
+
+	Open("postgres", "host=127.0.0.1 port=5432 user=test password=test dbname=test sslmode=disable")
+	defer Close()
+
+	old := GetSchema("test")
+	AddColumn("test", "addcolumn", "integer")
+	new := GetSchema("test")
+
+	if len(old.Columns) == len(new.Columns) {
+		t.Errorf("Column already exist")
+	}
+}
+
+func TestInsert(t *testing.T) {
+
+	Open("postgres", "host=127.0.0.1 port=5432 user=test password=test dbname=test sslmode=disable")
+	defer Close()
+
+	vl := make(AssRow)
+	vl["name"] = "toto"
+	vl["description"] = "tata"
+
+	old := GetAssociativeArray("test", []string{"*"}, "", []string{}, "")
+	jsonStringOld, _ := json.Marshal(old)
+	fmt.Println(string(jsonStringOld))
+
+	UpdateOrInsert("test", vl)
+
+	new := GetAssociativeArray("test", []string{"*"}, "", []string{}, "")
+	jsonStringNew, _ := json.Marshal(new)
+	fmt.Println(string(jsonStringNew))
+
+	if len(jsonStringOld) == len(jsonStringNew) {
+		t.Errorf("Error row not created")
+	}
+}
+
+func TestUpdate(t *testing.T) {
+
+	Open("postgres", "host=127.0.0.1 port=5432 user=test password=test dbname=test sslmode=disable")
+	defer Close()
+
+	vl := make(AssRow)
+	vl["id"] = 1
+	vl["name"] = "titi"
+	vl["description"] = "toto"
+
+	old := GetAssociativeArray("test", []string{"*"}, "", []string{}, "")
+	jsonStringOld, _ := json.Marshal(old)
+	fmt.Println(string(jsonStringOld))
+
+	UpdateOrInsert("test", vl)
+
+	new := GetAssociativeArray("test", []string{"*"}, "", []string{}, "")
+	jsonStringNew, _ := json.Marshal(new)
+	fmt.Println(string(jsonStringNew))
+
+	if string(jsonStringOld) == string(jsonStringNew) {
+		t.Errorf("Error row not updated")
+	}
+
+}
+
+func TestDelete(t *testing.T) {
+
+	Open("postgres", "host=127.0.0.1 port=5432 user=test password=test dbname=test sslmode=disable")
+	defer Close()
+
+	vl := make(AssRow)
+	vl["id"] = 1
+
+	old := GetAssociativeArray("test", []string{"*"}, "", []string{}, "")
+	jsonStringOld, _ := json.Marshal(old)
+	fmt.Println(string(jsonStringOld))
+
+	Delete("test", vl)
+
+	new := GetAssociativeArray("test", []string{"*"}, "", []string{}, "")
+	jsonStringNew, _ := json.Marshal(new)
+	fmt.Println(string(jsonStringNew))
+
+	if len(jsonStringOld) == len(jsonStringNew) {
+		t.Errorf("Error row not deleted")
+	}
+}
+
+func TestDeleteColumn(t *testing.T) {
+
+	Open("postgres", "host=127.0.0.1 port=5432 user=test password=test dbname=test sslmode=disable")
+	defer Close()
+
+	old := GetSchema("test")
+	DeleteColumn("test", "addcolumn")
+	new := GetSchema("test")
+
+	if len(old.Columns) == len(new.Columns) {
+		t.Errorf("Error column not deleted")
+	}
+}
+
+func TestDeleteTable(t *testing.T) {
+	Open("postgres", "host=127.0.0.1 port=5432 user=test password=test dbname=test sslmode=disable")
+	defer Close()
+
+	DeleteTable("test")
+
+	tbl := GetSchema("test")
+
+	if len(tbl.Columns) != 0 {
+		t.Errorf("Delete table failed")
+	}
+}

test_table.json

@@ -0,0 +1,17 @@
+{
+    "name":"test",
+    "columns":
+        {
+            "id":"integer",
+            "name":"varchar(255)",
+            "description":"varchar(1000)",
+            "startdate":"timestamp",
+            "enddate":"timestamp",
+            "latitude":"float",
+            "longitude":"float",
+            "intvalue":"integer",
+            "floatvalue":"float",
+            "price":"money",
+            "testtype_id":"integer"
+        }
+}

testtype_table.json

@@ -0,0 +1,17 @@
+{
+    "name":"testtype",
+    "columns":[
+        {
+            "name":"id",
+            "type":"integer"
+        },
+        {
+            "name":"name",
+            "type":"varchar(255)"
+        },        
+        {
+            "name":"detail",
+            "type":"varchar(255)"
+        }
+       ]
+}