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client.go
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client.go
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package sqlike
import (
"context"
"database/sql"
"log"
"strings"
"github.com/Masterminds/semver/v3"
"github.com/si3nloong/sqlike/v2/db"
"github.com/si3nloong/sqlike/v2/sql/charset"
sqlstmt "github.com/si3nloong/sqlike/v2/sql/stmt"
"github.com/si3nloong/sqlike/v2/x/reflext"
)
// DriverInfo :
type DriverInfo struct {
driverName string
version *semver.Version
charSet charset.Code
collate string
}
// DriverName :
func (d *DriverInfo) DriverName() string {
return d.driverName
}
// Version :
func (d *DriverInfo) Version() *semver.Version {
return d.version
}
// Charset :
func (d *DriverInfo) Charset() charset.Code {
return d.charSet
}
// Collate :
func (d *DriverInfo) Collate() string {
return d.collate
}
// Client : sqlike client is a client embedded with *sql.DB, so you may use any apis of *sql.DB
type Client struct {
*DriverInfo
*sql.DB
pk string
logger db.Logger
cache reflext.StructMapper
dialect db.Dialect
}
// newClient : create a new client struct by providing driver, *sql.DB, dialect etc
func newClient(
ctx context.Context,
driver string,
db *sql.DB,
dialect db.Dialect,
code charset.Code,
collate string,
) (*Client, error) {
driver = strings.TrimSpace(strings.ToLower(driver))
client := &Client{
DB: db,
dialect: dialect,
}
client.pk = "$Key"
client.DriverInfo = new(DriverInfo)
client.driverName = driver
client.charSet = code
client.collate = collate
client.cache = reflext.DefaultMapper()
client.version = client.getVersion(ctx)
if mysql8.GreaterThan(client.version) {
log.Println("DEPRECATION: SQLike no longer support MySQL 5.7 in future, try to upgrade your MySQL Database to at least 8.0 !!!")
}
return client, nil
}
// SetLogger : this is to set the logger for debugging, it will panic if the logger input is nil
func (c *Client) SetLogger(logger db.Logger) *Client {
if logger == nil {
panic("logger cannot be nil")
}
c.logger = logger
return c
}
// SetPrimaryKey : this will set a default primary key for subsequent operation such as Insert, InsertOne, ModifyOne
func (c *Client) SetPrimaryKey(pk string) *Client {
c.pk = pk
return c
}
// SetStructMapper : StructMapper is a mapper to reflect a struct on runtime and provide struct info
func (c *Client) SetStructMapper(mapper reflext.StructMapper) *Client {
c.cache = mapper
return c
}
// CreateDatabase : create database with name
func (c *Client) CreateDatabase(ctx context.Context, name string) error {
return c.createDB(ctx, name, true)
}
// DropDatabase : drop the selected database
func (c *Client) DropDatabase(ctx context.Context, name string) error {
return c.dropDB(ctx, name, true)
}
// ListDatabases : list all the database on current connection
func (c *Client) ListDatabases(ctx context.Context) ([]string, error) {
stmt := sqlstmt.AcquireStmt(c.dialect)
defer sqlstmt.ReleaseStmt(stmt)
c.dialect.GetDatabases(stmt)
rows, err := db.Query(
ctx,
getDriverFromContext(ctx, c.DB),
stmt,
c.logger,
)
if err != nil {
return nil, err
}
defer rows.Close()
dbs := make([]string, 0)
for i := 0; rows.Next(); i++ {
dbs = append(dbs, "")
if err := rows.Scan(&dbs[i]); err != nil {
return nil, err
}
}
return dbs, nil
}
// Database : this api will execute `USE database`, which will point your current connection to selected database
func (c *Client) Database(name string) *Database {
stmt := sqlstmt.AcquireStmt(c.dialect)
defer sqlstmt.ReleaseStmt(stmt)
c.dialect.UseDatabase(stmt, name)
if _, err := db.Execute(context.Background(), c.DB, stmt, c.logger); err != nil {
panic(err)
}
return &Database{
driverName: c.driverName,
name: name,
pk: c.pk,
client: c,
dialect: c.dialect,
driver: c.DB,
logger: c.logger,
}
}
// getVersion is a internal function to get sql driver's version
func (c *Client) getVersion(ctx context.Context) (version *semver.Version) {
var (
ver string
err error
)
stmt := sqlstmt.AcquireStmt(c.dialect)
defer sqlstmt.ReleaseStmt(stmt)
c.dialect.GetVersion(stmt)
err = db.QueryRowContext(
ctx,
getDriverFromContext(ctx, c.DB),
stmt,
c.logger,
).Scan(&ver)
if err != nil {
panic(err)
}
paths := strings.Split(ver, "-")
version, err = semver.NewVersion(paths[0])
if err != nil {
panic(err)
}
return
}
// createDB is a internal function for create a database
func (c *Client) createDB(ctx context.Context, name string, checkExists bool) error {
stmt := sqlstmt.AcquireStmt(c.dialect)
defer sqlstmt.ReleaseStmt(stmt)
c.dialect.CreateDatabase(stmt, name, checkExists)
_, err := db.Execute(
ctx,
getDriverFromContext(ctx, c.DB),
stmt,
c.logger,
)
return err
}
// dropDB is a internal function for drop a database
func (c *Client) dropDB(ctx context.Context, name string, checkExists bool) error {
stmt := sqlstmt.AcquireStmt(c.dialect)
defer sqlstmt.ReleaseStmt(stmt)
c.dialect.DropDatabase(stmt, name, checkExists)
_, err := db.Execute(
ctx,
getDriverFromContext(ctx, c.DB),
stmt,
c.logger,
)
return err
}