以插入数据为例，有三种方法：
1）直接拼接sql语句，执行execsql方法；
2）借用ContentValues进行插入；
3）使用compileStatement进行插入；

1）直接拼接sql语句，执行execsql方法

String sql = "create table msgTable(uid INTEGER NOT NULL,msg TEXT NOT NULL)";
db.execsql(sql);

缺点：存在sql注入危险；

源码分析：
execsql 调用关系如下：

public void execsql(String sql) throws sqlException {
   executesql(sql,null);
}

public void execsql(String sql,Object[] bindArgs) throws sqlException {
	if (bindArgs == null) {
		throw new IllegalArgumentException("Empty bindArgs");
	}
	executesql(sql,bindArgs);
}
	
private int executesql(String sql,Object[] bindArgs) throws sqlException {
	if (DatabaseUtils.getsqlStatementType(sql) == DatabaseUtils.STATEMENT_ATTACH) {
		disableWriteAheadLogging();
		mHasAttachedDbs = true;
	}
	
	sqliteStatement statement = new sqliteStatement(this,sql,bindArgs);
	try {
		return statement.executeUpdateDelete();
	} catch (sqliteDatabaseCorruptException e) {
		onCorruption();
		throw e;
	} finally {
		statement.close();
	}
}

从调用关系看：execsql调用的本质就是创建sqliteStatement对象，调用其executeUpdateDelete插入方法，
而executeUpdateDelete() 方法调用native c++方法，具体如下：

public int executeUpdateDelete() {
	try {
		savesqlAsLastsqlStatement();
		acquireAndLock(WRITE);
		int numChanges = 0;
		if ((mStatementType & STATEMENT_DONT_PREPARE) > 0) {
			// since the statement doesn't have to be prepared,// call the following native method which will not prepare
			// the query plan
			native_executesql(msql);
		} else {
			numChanges = native_execute();
		}
		return numChanges;
	} finally {
		releaseAndUnlock();
	}
}

2）借用ContentValues进行插入

ContentValues values = new ContentValues();
values.put("uid",12);
values.put("msg","test");

long newRowId = db.insert("msgTable",null,values);

优点：解决了执行纯sql语句引入的sql注入漏洞。

源码分析：

public long insert(String table,String nullColumnHack,ContentValues values) {
	try {
		return insertWithOnConflict(table,nullColumnHack,values,CONFLICT_NONE);
	} catch (sqlException e) {
		Log.e(TAG,"Error inserting " + values,e);
		return -1;
	}
}


public long insertWithOnConflict(String table,ContentValues initialValues,int conflictAlgorithm) {
	StringBuilder sql = new StringBuilder();
	sql.append("INSERT");
	sql.append(CONFLICT_VALUES[conflictAlgorithm]);
	sql.append(" INTO ");
	sql.append(table);
	sql.append('(');


	Object[] bindArgs = null;
	int size = (initialValues != null && initialValues.size() > 0) ? initialValues.size() : 0;
	if (size > 0) {
		bindArgs = new Object[size];
		int i = 0;
		for (String colName : initialValues.keySet()) {
			sql.append((i > 0) ? "," : "");
			sql.append(colName);
			bindArgs[i++] = initialValues.get(colName);
		}
		sql.append(')');
		sql.append(" VALUES (");
		for (i = 0; i < size; i++) {
			sql.append((i > 0) ? ",?" : "?");
		}
	} else {
		sql.append(nullColumnHack + ") VALUES (NULL");
	}
	sql.append(')');


	sqliteStatement statement = new sqliteStatement(this,sql.toString(),bindArgs);
	try {
		return statement.executeInsert();
	} catch (sqliteDatabaseCorruptException e) {
		onCorruption();
		throw e;
	} finally {
		statement.close();
	}
}

使用ContentValues 最终是创建sqliteStatement对象，并调用executeInsert()方法。

3）使用compileStatement进行插入

sqliteStatement sqliteStatement = db.compileStatement("insert into msgTable(uid,msg) values(?,?)");
sqliteStatement.bindLong(1,12);
sqliteStatement.bindString(3,"text");
long newRowId = sqliteStatement.executeInsert();

源码分析：

public sqliteStatement compileStatement(String sql) throws sqlException {
	verifyDbIsOpen();
	return new sqliteStatement(this,null);
}

compileStatement 更加直接，之间是根据传入的参数，创建一个sqliteStatement对象。 小结： 对于执行纯sql，ContentValues和compileStatement最终都是new 一个sqliteStatement对象，并调用sqliteStatement对象的相应方法。 原文链接：https://www.f2er.com/sqlite/199899.html